/* roulang page: index */
:root {
        --bg-void: #0A1220;
        --bg-deep: #0D1A2F;
        --brand-blue: #2E6BFF;
        --brand-cyan: #2BD9FF;
        --brand-lime: #C9F542;
        --text-high: #F1F6FE;
        --text-mid: #9FB0C3;
        --text-low: #61748A;
        --glass-bg: rgba(255, 255, 255, 0.05);
        --glass-border: rgba(255, 255, 255, 0.09);
        --radius-card: 24px;
        --radius-btn: 999px;
        --shadow-glow: 0 0 42px rgba(43, 217, 255, 0.35);
        --font-sans: "Inter", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
    }
    * {
        box-sizing: border-box;
        margin: 0;
        padding: 0;
    }
    html {
        scroll-behavior: smooth;
    }
    body {
        background-color: var(--bg-void);
        color: var(--text-high);
        font-family: var(--font-sans);
        line-height: 1.6;
        -webkit-font-smoothing: antialiased;
        padding-bottom: 96px;
    }
    @media (min-width: 768px) {
        body {
            padding-bottom: 96px;
        }
    }
    .container-x {
        max-width: 1200px;
        margin-left: auto;
        margin-right: auto;
        padding-left: 16px;
        padding-right: 16px;
    }
    @media (min-width: 768px) {
        .container-x {
            padding-left: 32px;
            padding-right: 32px;
        }
    }
    .section-pad {
        padding-top: 80px;
        padding-bottom: 80px;
    }
    @media (min-width: 768px) {
        .section-pad {
            padding-top: 128px;
            padding-bottom: 128px;
        }
    }
    .glass-card {
        background: var(--glass-bg);
        border: 1px solid var(--glass-border);
        border-radius: var(--radius-card);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        box-shadow: 0 8px 30px rgba(0, 0, 0, 0.18);
        transition: transform .3s ease, border-color .3s ease, box-shadow .3s ease;
        position: relative;
        overflow: hidden;
    }
    .glass-card::before {
        content: "";
        position: absolute;
        top: 0;
        left: 0;
        width: 2px;
        height: 56px;
        background: linear-gradient(to bottom, rgba(43, 217, 255, 0.9), transparent);
        border-radius: 0 0 2px 2px;
        z-index: 1;
    }
    .glass-card:hover {
        transform: translateY(-3px);
        border-color: rgba(43, 217, 255, 0.35);
        box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25), 0 0 30px rgba(43, 217, 255, 0.08);
    }
    .btn-primary {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        background: linear-gradient(135deg, #2E6BFF, #2BD9FF);
        color: #fff;
        font-weight: 700;
        font-size: 15px;
        padding: 14px 32px;
        border-radius: var(--radius-btn);
        box-shadow: var(--shadow-glow);
        border: none;
        cursor: pointer;
        transition: all .3s ease;
        text-decoration: none;
        line-height: 1.4;
        white-space: nowrap;
    }
    .btn-primary:hover {
        filter: brightness(1.1);
        box-shadow: 0 0 52px rgba(43, 217, 255, 0.55);
        transform: scale(1.02);
    }
    .btn-primary:active {
        transform: scale(0.98);
    }
    .btn-secondary {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        gap: 8px;
        background: rgba(255, 255, 255, 0.06);
        color: var(--text-high);
        font-weight: 600;
        font-size: 15px;
        padding: 14px 32px;
        border-radius: var(--radius-btn);
        border: 1px solid rgba(255, 255, 255, 0.15);
        cursor: pointer;
        transition: all .3s ease;
        text-decoration: none;
        line-height: 1.4;
        white-space: nowrap;
    }
    .btn-secondary:hover {
        background: rgba(255, 255, 255, 0.12);
        border-color: rgba(255, 255, 255, 0.25);
    }
    .badge {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        padding: 4px 14px;
        border-radius: var(--radius-btn);
        font-size: 13px;
        font-weight: 600;
        background: rgba(43, 217, 255, 0.12);
        color: var(--brand-cyan);
        border: 1px solid rgba(43, 217, 255, 0.2);
    }
    .badge-lime {
        background: rgba(201, 245, 66, 0.1);
        color: var(--brand-lime);
        border-color: rgba(201, 245, 66, 0.18);
    }
    .section-label {
        display: inline-block;
        font-size: 13px;
        font-weight: 700;
        letter-spacing: 0.08em;
        text-transform: uppercase;
        color: var(--brand-cyan);
        margin-bottom: 16px;
    }
    .section-title {
        font-size: 32px;
        line-height: 1.2;
        font-weight: 800;
        color: var(--text-high);
        padding-left: 48px;
        position: relative;
        margin-bottom: 20px;
        letter-spacing: -0.02em;
    }
    .section-title::before {
        content: "";
        position: absolute;
        left: 0;
        top: 8px;
        bottom: 8px;
        width: 40px;
        background: linear-gradient(to bottom, rgba(43, 217, 255, 0.9), rgba(46, 107, 255, 0.4), transparent);
        border-radius: 4px;
    }
    @media (min-width: 768px) {
        .section-title {
            font-size: 40px;
        }
    }
    .grid-bg {
        background-image: linear-gradient(rgba(43, 217, 255, 0.04) 1px, transparent 1px), linear-gradient(90deg, rgba(43, 217, 255, 0.04) 1px, transparent 1px);
        background-size: 56px 56px;
    }
    .hero-overlay {
        background: linear-gradient(180deg, rgba(10, 18, 32, 0.6) 0%, rgba(10, 18, 32, 0.75) 40%, var(--bg-void) 100%);
    }
    .nav-link {
        position: relative;
        color: var(--text-mid);
        font-weight: 500;
        font-size: 15px;
        padding: 6px 2px;
        transition: color .2s ease;
        text-decoration: none;
    }
    .nav-link:hover {
        color: var(--text-high);
    }
    .nav-link.active {
        color: var(--text-high);
    }
    .nav-link.active::after {
        content: "";
        position: absolute;
        left: 0;
        right: 0;
        bottom: -2px;
        height: 2px;
        background: linear-gradient(90deg, var(--brand-cyan), transparent);
        border-radius: 2px;
    }
    .header-glass {
        background: rgba(10, 18, 32, 0.78);
        backdrop-filter: blur(24px);
        -webkit-backdrop-filter: blur(24px);
        border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        transition: background .3s ease, box-shadow .3s ease;
    }
    .header-scrolled {
        background: rgba(10, 18, 32, 0.92);
        box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    }
    .stat-number {
        font-size: 40px;
        line-height: 1.1;
        font-weight: 800;
        color: var(--brand-lime);
        letter-spacing: -0.02em;
    }
    @media (min-width: 768px) {
        .stat-number {
            font-size: 52px;
        }
    }
    .mobile-tab {
        background: rgba(10, 18, 32, 0.85);
        backdrop-filter: blur(24px);
        -webkit-backdrop-filter: blur(24px);
        border-top: 1px solid rgba(255, 255, 255, 0.1);
    }
    .tab-item {
        color: var(--text-low);
        transition: color .2s ease;
    }
    .tab-item.active {
        color: var(--brand-cyan);
    }
    .tab-item.active .tab-glow {
        opacity: 1;
    }
    .tab-glow {
        position: absolute;
        top: -20px;
        left: 50%;
        transform: translateX(-50%);
        width: 48px;
        height: 48px;
        background: radial-gradient(circle, rgba(43, 217, 255, 0.25), transparent 70%);
        border-radius: 50%;
        opacity: 0;
        transition: opacity .3s ease;
        pointer-events: none;
    }
    .wave-line {
        width: 100%;
        height: 80px;
        opacity: 0.5;
    }
    .feature-icon {
        width: 56px;
        height: 56px;
        border-radius: 16px;
        display: flex;
        align-items: center;
        justify-content: center;
        background: linear-gradient(135deg, rgba(46, 107, 255, 0.15), rgba(43, 217, 255, 0.1));
        border: 1px solid rgba(43, 217, 255, 0.18);
        margin-bottom: 20px;
    }
    .cover-wrap {
        border-radius: 24px;
        overflow: hidden;
        border: 1px solid var(--glass-border);
        position: relative;
    }
    .cover-wrap img {
        width: 100%;
        height: 100%;
        object-fit: cover;
        display: block;
        transition: transform .5s ease;
    }
    .cover-wrap:hover img {
        transform: scale(1.03);
    }
    .faq-item {
        border: 1px solid var(--glass-border);
        border-radius: 16px;
        background: var(--glass-bg);
        overflow: hidden;
        transition: border-color .3s ease;
    }
    .faq-item.open {
        border-color: rgba(43, 217, 255, 0.3);
    }
    .faq-q {
        width: 100%;
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 20px 24px;
        background: transparent;
        border: none;
        color: var(--text-high);
        font-size: 16px;
        font-weight: 600;
        text-align: left;
        cursor: pointer;
        font-family: var(--font-sans);
        transition: background .2s ease;
    }
    .faq-q:hover {
        background: rgba(255, 255, 255, 0.03);
    }
    .faq-icon {
        width: 28px;
        height: 28px;
        border-radius: 50%;
        border: 1px solid rgba(255, 255, 255, 0.15);
        display: flex;
        align-items: center;
        justify-content: center;
        transition: transform .3s ease, border-color .3s ease;
        flex-shrink: 0;
        margin-left: 16px;
        color: var(--brand-cyan);
    }
    .faq-item.open .faq-icon {
        transform: rotate(45deg);
        border-color: var(--brand-cyan);
    }
    .faq-a {
        max-height: 0;
        overflow: hidden;
        transition: max-height .4s ease, padding .3s ease;
        padding: 0 24px;
        color: var(--text-mid);
        font-size: 15px;
        line-height: 1.8;
        border-left: 2px solid transparent;
    }
    .faq-item.open .faq-a {
        max-height: 500px;
        padding: 4px 24px 20px;
        border-left: 2px solid var(--brand-cyan);
    }
    .field-input {
        width: 100%;
        background: rgba(255, 255, 255, 0.05);
        border: 1px solid rgba(255, 255, 255, 0.1);
        border-radius: 12px;
        padding: 14px 16px;
        color: var(--text-high);
        font-size: 14px;
        font-family: var(--font-sans);
        transition: border-color .2s ease, box-shadow .2s ease;
    }
    .field-input::placeholder {
        color: var(--text-low);
    }
    .field-input:focus {
        outline: none;
        border-color: var(--brand-cyan);
        box-shadow: 0 0 0 3px rgba(43, 217, 255, 0.15);
    }
    .footer-bg {
        background: #060C16;
        border-top: 1px solid rgba(255, 255, 255, 0.05);
    }
    .empty-state {
        background: var(--glass-bg);
        border: 1px solid var(--glass-border);
        border-radius: var(--radius-card);
        min-height: 220px;
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 16px;
        color: var(--text-mid);
        text-align: center;
        padding: 32px;
    }
    .news-card-left {
        background: var(--glass-bg);
        border: 1px solid var(--glass-border);
        border-radius: var(--radius-card);
        overflow: hidden;
        transition: border-color .3s ease, transform .3s ease;
        display: flex;
        flex-direction: column;
    }
    .news-card-left:hover {
        border-color: rgba(43, 217, 255, 0.35);
        transform: translateY(-2px);
    }
    .news-item-sm {
        display: flex;
        gap: 16px;
        padding: 16px;
        background: var(--glass-bg);
        border: 1px solid var(--glass-border);
        border-radius: 16px;
        transition: border-color .3s ease, background .3s ease;
    }
    .news-item-sm:hover {
        border-color: rgba(43, 217, 255, 0.3);
        background: rgba(255, 255, 255, 0.08);
    }
    .scroll-indicator {
        animation: scrollBounce 1.8s ease-in-out infinite;
    }
    @keyframes scrollBounce {
        0%, 100% {
            transform: translateY(0);
            opacity: 0.6;
        }
        50% {
            transform: translateY(8px);
            opacity: 1;
        }
    }
    .cta-glow {
        background: radial-gradient(circle at center, rgba(43, 217, 255, 0.15), transparent 65%);
    }
    .logo-icon {
        width: 40px;
        height: 40px;
        border-radius: 50%;
        background: linear-gradient(135deg, var(--brand-blue), var(--brand-cyan));
        display: flex;
        align-items: center;
        justify-content: center;
        box-shadow: var(--shadow-glow);
        flex-shrink: 0;
    }
    .timeline-line {
        position: relative;
    }
    .timeline-line::before {
        content: "";
        position: absolute;
        top: 24px;
        left: 0;
        right: 0;
        height: 2px;
        background: linear-gradient(90deg, var(--brand-blue), var(--brand-cyan), transparent);
        border-radius: 2px;
    }
    .pagination-link {
        color: var(--text-low);
        transition: color .2s ease;
    }
    .pagination-link:hover {
        color: var(--brand-cyan);
    }
    input:focus-visible,
    button:focus-visible,
    a:focus-visible {
        outline: 2px solid var(--brand-cyan);
        outline-offset: 3px;
    }
    @media (min-width: 768px) {
        .md\:hidden {
            display: none !important;
        }
    }
    @media (max-width: 767px) {
        .desktop-nav {
            display: none !important;
        }
        .mobile-header-btn {
            display: inline-flex !important;
        }
    }
    @media (min-width: 768px) {
        .mobile-header-btn {
            display: none !important;
        }
    }
    .conversion-bar {
        position: fixed;
        z-index: 50;
        background: rgba(10, 18, 32, 0.92);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        transition: transform .3s ease, opacity .3s ease;
    }
    .conversion-bar.hidden-bar {
        transform: translateY(100%);
        opacity: 0;
        pointer-events: none;
    }
    @media (max-width: 767px) {
        .conversion-bar {
            bottom: 64px;
            left: 0;
            right: 0;
            height: 56px;
            padding: 8px 16px;
        }
    }
    @media (min-width: 768px) {
        .conversion-bar {
            bottom: 0;
            left: 0;
            right: 0;
            height: 64px;
            padding: 8px 24px;
        }
    }
    .close-bar {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 28px;
        height: 28px;
        border-radius: 50%;
        border: 1px solid rgba(255, 255, 255, 0.15);
        color: var(--text-low);
        cursor: pointer;
        background: transparent;
        transition: color .2s ease, border-color .2s ease;
    }
    .close-bar:hover {
        color: var(--text-high);
        border-color: rgba(255, 255, 255, 0.3);
    }
    .logo-text {
        font-size: 20px;
        font-weight: 800;
        letter-spacing: -0.01em;
        color: var(--text-high);
        white-space: nowrap;
    }
    @media (max-width: 380px) {
        .logo-text {
            font-size: 17px;
        }
    }
    .wave-svg {
        position: absolute;
        bottom: 0;
        left: 0;
        width: 100%;
        height: 120px;
        opacity: 0.35;
    }
    .codex-pill {
        display: inline-block;
        padding: 3px 12px;
        border-radius: 999px;
        font-size: 12px;
        font-weight: 600;
        background: rgba(201, 245, 66, 0.08);
        color: var(--brand-lime);
        border: 1px solid rgba(201, 245, 66, 0.15);
    }

/* roulang page: article */
:root {
  --bg-void: #0A1220;
  --bg-deep: #0D1A2F;
  --brand-blue: #2E6BFF;
  --brand-cyan: #2BD9FF;
  --brand-lime: #C9F542;
  --text-high: #F1F6FE;
  --text-mid: #9FB0C3;
  --text-low: #61748A;
  --glass-bg: rgba(255,255,255,0.05);
  --glass-border: rgba(255,255,255,0.09);
  --radius-card: 24px;
  --radius-btn: 999px;
  --shadow-glow: 0 0 42px rgba(43,217,255,0.35);
}
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
html {
  scroll-behavior: smooth;
}
body {
  font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  background: var(--bg-void);
  color: var(--text-high);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 7.5rem;
}
@media (min-width: 1024px) {
  body {
    padding-bottom: 6rem;
  }
}
.container-x {
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 1rem;
}
@media (min-width: 768px) {
  .container-x {
    padding: 0 2rem;
  }
}
a {
  text-decoration: none;
  color: inherit;
}
img {
  max-width: 100%;
  display: block;
}
button {
  cursor: pointer;
  font-family: inherit;
}
.header-glass {
  background: rgba(10, 18, 32, 0.78);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: all 0.3s ease;
}
.header-glass.scrolled {
  background: rgba(10, 18, 32, 0.94);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.35);
}
.logo-icon {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(46, 107, 255, 0.3), rgba(43, 217, 255, 0.2));
  border: 1px solid rgba(43, 217, 255, 0.35);
  box-shadow: 0 0 20px rgba(43, 217, 255, 0.2);
  flex-shrink: 0;
}
.logo-text {
  font-size: 1.125rem;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text-high);
  white-space: nowrap;
}
.nav-link {
  position: relative;
  font-size: 0.925rem;
  font-weight: 500;
  color: var(--text-mid);
  padding: 6px 2px;
  transition: color 0.25s ease;
}
.nav-link:hover {
  color: var(--text-high);
}
.nav-link.active {
  color: var(--text-high);
}
.nav-link.active::after {
  content: '';
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: -2px;
  width: 100%;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--brand-cyan), transparent);
  box-shadow: 0 0 8px rgba(43, 217, 255, 0.6);
}
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: linear-gradient(135deg, #2E6BFF, #2BD9FF);
  color: #fff;
  font-weight: 700;
  border-radius: 999px;
  padding: 14px 32px;
  box-shadow: var(--shadow-glow);
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  text-decoration: none;
  font-size: 0.925rem;
  line-height: 1.4;
}
.btn-primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 0 52px rgba(43, 217, 255, 0.45);
  transform: scale(1.02);
}
.btn-primary:active {
  transform: scale(0.98);
}
.btn-primary:focus-visible,
.btn-secondary:focus-visible,
.nav-link:focus-visible,
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--brand-cyan);
  outline-offset: 3px;
}
.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  background: var(--glass-bg);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-high);
  font-weight: 600;
  border-radius: 999px;
  padding: 14px 32px;
  transition: all 0.3s ease;
  text-decoration: none;
  font-size: 0.925rem;
  line-height: 1.4;
  cursor: pointer;
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-1px);
}
.btn-secondary:active {
  transform: translateY(0) scale(0.98);
}
.glass {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-card);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.18);
}
.grid-pattern {
  background-image:
    linear-gradient(rgba(43, 217, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(43, 217, 255, 0.04) 1px, transparent 1px);
  background-size: 40px 40px;
}
.section-title {
  position: relative;
  font-size: 1.875rem;
  font-weight: 800;
  line-height: 1.25;
  padding-left: 20px;
}
@media (min-width: 768px) {
  .section-title {
    font-size: 2.25rem;
  }
}
.section-title::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.14em;
  width: 4px;
  height: 0.9em;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--brand-cyan), transparent);
  box-shadow: 0 0 10px rgba(43, 217, 255, 0.5);
}
/* 文章正文样式 */
.article-body {
  font-size: 17px;
  line-height: 1.9;
  color: var(--text-high);
  word-break: break-word;
}
.article-body p {
  margin-bottom: 1.5em;
  color: #C7D3E2;
  max-width: 42rem;
}
.article-body h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-top: 2.5em;
  margin-bottom: 0.8em;
  line-height: 1.4;
  position: relative;
  padding-left: 20px;
}
.article-body h2::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.16em;
  width: 4px;
  height: 1em;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--brand-cyan), transparent);
}
.article-body h3 {
  font-size: 1.3rem;
  font-weight: 600;
  margin-top: 2em;
  margin-bottom: 0.7em;
  line-height: 1.5;
  color: var(--text-high);
}
.article-body a {
  color: var(--brand-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: opacity 0.2s;
}
.article-body a:hover {
  opacity: 0.8;
}
.article-body blockquote {
  border-left: 3px solid var(--brand-cyan);
  background: var(--glass-bg);
  padding: 18px 22px;
  border-radius: 0 16px 16px 0;
  margin: 2em 0;
  color: var(--text-mid);
  font-style: italic;
}
.article-body img {
  border-radius: 16px;
  margin: 2.2em auto;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}
.article-body ul,
.article-body ol {
  margin: 1em 0 1.5em 1.6em;
  color: #C7D3E2;
  line-height: 1.8;
}
.article-body li {
  margin-bottom: 0.5em;
}
.article-body code {
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 7px;
  border-radius: 5px;
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  font-size: 0.88em;
}
.article-body pre {
  background: #0A1220;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  padding: 20px;
  overflow-x: auto;
  margin: 2em 0;
}
.article-body pre code {
  background: transparent;
  color: var(--brand-lime);
  padding: 0;
}
.article-body hr {
  border: none;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  margin: 3em 0;
}
/* 标签 pill */
.tag-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--text-mid);
  font-size: 0.8rem;
  font-weight: 500;
  transition: all 0.25s ease;
}
.tag-pill:hover {
  color: var(--text-high);
  border-color: rgba(43, 217, 255, 0.4);
  background: rgba(255, 255, 255, 0.08);
}
/* 前后篇卡片 */
.prevnext-card {
  display: block;
  padding: 1.5rem;
  border-radius: 18px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  transition: all 0.3s ease;
}
.prevnext-card:hover {
  border-color: rgba(43, 217, 255, 0.35);
  background: rgba(255, 255, 255, 0.07);
  transform: translateY(-2px);
}
/* 相关推荐卡片 */
.related-card {
  position: relative;
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  transition: all 0.35s ease;
  display: flex;
  flex-direction: column;
}
.related-card:hover {
  transform: translateY(-4px);
  border-color: rgba(43, 217, 255, 0.35);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}
.related-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 2px;
  height: 48px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--brand-cyan), transparent);
  z-index: 1;
}
.related-card .related-img {
  aspect-ratio: 16 / 10;
  object-fit: cover;
  width: 100%;
  transition: transform 0.5s ease;
}
.related-card:hover .related-img {
  transform: scale(1.04);
}
/* 空态 */
.empty-state {
  min-height: 220px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 16px;
}
.empty-state-icon {
  width: 64px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--brand-cyan);
  box-shadow: 0 0 30px rgba(43, 217, 255, 0.15);
}
/* 页面主体顶部留白 */
.page-main {
  padding-top: 0;
}
/* 文章 Hero */
.article-hero {
  position: relative;
  padding: 9rem 0 4rem;
  overflow: hidden;
}
@media (min-width: 768px) {
  .article-hero {
    padding: 10rem 0 5rem;
  }
}
.article-hero-bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
}
.article-hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 18, 32, 0.88) 0%, rgba(10, 18, 32, 0.72) 50%, var(--bg-void) 100%);
}
/* 摘要块 */
.summary-block {
  position: relative;
  padding-left: 20px;
  margin-top: 1.6rem;
  max-width: 42rem;
}
.summary-block::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.2em;
  width: 3px;
  height: 1.4em;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--brand-cyan), transparent);
}
/* 转化条 */
.convert-bar {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 55;
  background: rgba(10, 18, 32, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  transform: translateY(100%);
  opacity: 0;
  transition: transform 0.5s ease, opacity 0.5s ease;
}
.convert-bar.show {
  transform: translateY(0);
  opacity: 1;
}
.convert-bar .desktop-convert {
  display: none;
}
.convert-bar .mobile-convert {
  display: flex;
  height: 56px;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  gap: 10px;
}
@media (max-width: 767px) {
  .convert-bar {
    bottom: 64px;
  }
}
@media (min-width: 768px) {
  .convert-bar .mobile-convert {
    display: none;
  }
  .convert-bar .desktop-convert {
    display: flex;
    height: 64px;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    max-width: 1280px;
    margin: 0 auto;
  }
}
/* 移动端底部 Tab */
.mobile-tabbar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 60;
  background: rgba(10, 18, 32, 0.86);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  height: 64px;
}
@media (min-width: 768px) {
  .mobile-tabbar {
    display: none;
  }
}
.tab-item {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 3px;
  color: var(--text-low);
  font-size: 0.68rem;
  font-weight: 500;
  transition: color 0.2s ease;
  position: relative;
}
.tab-item svg {
  width: 20px;
  height: 20px;
  stroke-width: 1.8;
}
.tab-item.active {
  color: var(--brand-cyan);
}
.tab-item.active::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 32px;
  height: 2px;
  border-radius: 2px;
  background: var(--brand-cyan);
  box-shadow: 0 0 10px rgba(43, 217, 255, 0.7);
}
/* footer */
.footer-bg {
  background: #070D18;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
}
.footer-link {
  font-size: 0.875rem;
  color: var(--text-mid);
  transition: color 0.2s ease;
}
.footer-link:hover {
  color: #fff;
}
/* 声波装饰线 */
.wave-line {
  width: 100%;
  height: 24px;
  background: radial-gradient(50% 100% at 50% 50%, rgba(43, 217, 255, 0.25), transparent);
  border-radius: 999px;
  filter: blur(4px);
}
/* 滚动指示 */
.scroll-indicator {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.scroll-indicator .line {
  width: 2px;
  height: 40px;
  background: linear-gradient(180deg, var(--brand-cyan), transparent);
  animation: scroll-line 1.6s ease-in-out infinite;
}
@keyframes scroll-line {
  0%, 100% {
    opacity: 0.4;
    transform: scaleY(0.8);
    transform-origin: top;
  }
  50% {
    opacity: 1;
    transform: scaleY(1.1);
    transform-origin: top;
  }
}
@media (max-width: 520px) {
  .article-hero {
    padding-top: 7.5rem;
  }
  .logo-text {
    font-size: 1rem;
  }
  .section-title {
    font-size: 1.5rem;
    padding-left: 16px;
  }
  .article-body {
    font-size: 16px;
    line-height: 1.85;
  }
}

/* roulang page: category1 */
:root {
            --bg-void: #0A1220;
            --bg-deep: #0D1A2F;
            --brand-blue: #2E6BFF;
            --brand-cyan: #2BD9FF;
            --brand-lime: #C9F542;
            --text-high: #F1F6FE;
            --text-mid: #9FB0C3;
            --text-low: #61748A;
            --glass-bg: rgba(255, 255, 255, 0.05);
            --glass-border: rgba(255, 255, 255, 0.09);
            --radius-card: 24px;
            --radius-btn: 999px;
            --shadow-glow: 0 0 42px rgba(43, 217, 255, 0.35);
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: Inter, "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
            background-color: var(--bg-void);
            color: var(--text-high);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            padding-bottom: 8rem;
        }

        @media (min-width: 768px) {
            body {
                padding-bottom: 6rem;
            }
        }

        a {
            text-decoration: none;
            color: inherit;
        }

        img {
            max-width: 100%;
            display: block;
        }

        button {
            cursor: pointer;
        }

        .container-x {
            max-width: 80rem;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1rem;
            padding-right: 1rem;
        }

        @media (min-width: 768px) {
            .container-x {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }

        .section {
            padding: 5rem 0;
        }

        @media (min-width: 768px) {
            .section {
                padding: 8rem 0;
            }
        }

        /* Header */
        .header-glass {
            background: rgba(10, 18, 32, 0.78);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            transition: background 0.3s, box-shadow 0.3s;
        }

        .header-scrolled {
            background: rgba(10, 18, 32, 0.92);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
        }

        .logo-icon {
            width: 38px;
            height: 38px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 12px;
            background: linear-gradient(135deg, rgba(46, 107, 255, 0.25), rgba(43, 217, 255, 0.15));
            border: 1px solid rgba(43, 217, 255, 0.3);
            flex-shrink: 0;
        }

        .logo-text {
            font-size: 1.15rem;
            font-weight: 800;
            letter-spacing: 0.02em;
            background: linear-gradient(90deg, #fff, rgba(43, 217, 255, 0.9));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            white-space: nowrap;
        }

        .nav-link {
            position: relative;
            font-size: 0.95rem;
            color: var(--text-mid);
            font-weight: 500;
            padding-bottom: 4px;
            transition: color 0.2s;
        }

        .nav-link:hover {
            color: var(--text-high);
        }

        .nav-link.active {
            color: var(--text-high);
        }

        .nav-link.active::after {
            content: "";
            position: absolute;
            left: 0;
            right: 0;
            bottom: -2px;
            height: 2px;
            border-radius: 2px;
            background: linear-gradient(90deg, var(--brand-cyan), transparent);
        }

        @media (max-width: 767px) {
            .desktop-nav nav {
                display: none;
            }
        }

        /* Buttons */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-btn);
            background: linear-gradient(135deg, #2E6BFF, #2BD9FF);
            color: #fff;
            font-weight: 700;
            font-size: 0.95rem;
            box-shadow: var(--shadow-glow);
            transition: transform 0.2s, box-shadow 0.3s, filter 0.2s;
            white-space: nowrap;
            border: none;
        }

        .btn-primary:hover {
            transform: scale(1.02);
            box-shadow: 0 0 52px rgba(43, 217, 255, 0.5);
            filter: brightness(1.08);
        }

        .btn-primary:active {
            transform: scale(0.98);
        }

        .btn-outline {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-btn);
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.15);
            color: var(--text-high);
            font-weight: 600;
            font-size: 0.95rem;
            backdrop-filter: blur(8px);
            transition: background 0.2s, border-color 0.2s, transform 0.2s;
            white-space: nowrap;
        }

        .btn-outline:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(43, 217, 255, 0.4);
            transform: translateY(-1px);
        }

        /* Glass Card */
        .glass-card {
            position: relative;
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-card);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.18);
            transition: transform 0.25s, border-color 0.25s, box-shadow 0.25s;
            overflow: hidden;
        }

        .glass-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 2px;
            height: 56px;
            border-radius: 0 0 4px 4px;
            background: linear-gradient(180deg, var(--brand-cyan), transparent);
        }

        .glass-card:hover {
            transform: translateY(-3px);
            border-color: rgba(43, 217, 255, 0.35);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3), 0 0 30px rgba(43, 217, 255, 0.1);
        }

        /* Section header */
        .section-head {
            max-width: 780px;
        }

        .section-tag {
            display: inline-block;
            font-size: 0.85rem;
            font-weight: 700;
            letter-spacing: 0.08em;
            color: var(--brand-cyan);
            background: rgba(43, 217, 255, 0.1);
            border: 1px solid rgba(43, 217, 255, 0.25);
            border-radius: 999px;
            padding: 6px 14px;
        }

        .section-title {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 2rem;
            font-weight: 800;
            line-height: 1.25;
            margin-top: 1.25rem;
            color: var(--text-high);
        }

        .section-title::before {
            content: "";
            width: 4px;
            height: 40px;
            border-radius: 4px;
            background: linear-gradient(180deg, var(--brand-cyan), transparent);
            flex-shrink: 0;
        }

        @media (min-width: 768px) {
            .section-title {
                font-size: 2.5rem;
            }
        }

        .section-subtitle {
            margin-top: 1rem;
            color: var(--text-mid);
            font-size: 1rem;
            line-height: 1.8;
        }

        @media (min-width: 768px) {
            .section-subtitle {
                font-size: 1.05rem;
            }
        }

        /* Hero */
        .hero-grid {
            background-image:
                linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
            background-size: 44px 44px;
        }

        .hero-badge {
            display: inline-block;
            padding: 8px 18px;
            border-radius: 999px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--brand-cyan);
            background: rgba(43, 217, 255, 0.08);
            border: 1px solid rgba(43, 217, 255, 0.2);
            letter-spacing: 0.05em;
        }

        .hero-visual {
            border-radius: var(--radius-card);
            border: 1px solid rgba(255, 255, 255, 0.12);
            background: rgba(255, 255, 255, 0.04);
            backdrop-filter: blur(8px);
            padding: 10px;
            box-shadow: 0 20px 80px rgba(0, 0, 0, 0.35);
        }

        .hero-visual img {
            border-radius: calc(var(--radius-card) - 8px);
            aspect-ratio: 16/10;
            object-fit: cover;
            width: 100%;
        }

        .hero-float-card {
            position: absolute;
            bottom: -16px;
            left: -20px;
            background: rgba(13, 26, 47, 0.85);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 16px;
            padding: 12px 16px;
            backdrop-filter: blur(12px);
            display: flex;
            align-items: center;
            gap: 10px;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
        }

        .float-dot {
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--brand-lime);
            box-shadow: 0 0 12px rgba(201, 245, 66, 0.6);
            animation: pulse-dot 2s ease-in-out infinite;
        }

        @keyframes pulse-dot {
            0%,
            100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.5;
                transform: scale(0.8);
            }
        }

        .hero-wave {
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 80px;
            pointer-events: none;
            opacity: 0.7;
        }

        .scroll-hint {
            position: absolute;
            right: 24px;
            bottom: 24px;
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-low);
            font-size: 0.8rem;
            z-index: 10;
        }

        .scroll-line {
            width: 1px;
            height: 42px;
            background: rgba(255, 255, 255, 0.15);
            position: relative;
            overflow: hidden;
        }

        .scroll-line::after {
            content: "";
            position: absolute;
            top: -50%;
            left: 0;
            width: 1px;
            height: 50%;
            background: var(--brand-cyan);
            animation: scrollMove 1.8s ease-in-out infinite;
        }

        @keyframes scrollMove {
            0% {
                top: -50%;
            }
            100% {
                top: 100%;
            }
        }

        @media (max-width: 767px) {
            .scroll-hint {
                display: none;
            }
        }

        /* Card icon */
        .card-icon {
            width: 56px;
            height: 56px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, rgba(46, 107, 255, 0.2), rgba(43, 217, 255, 0.1));
            border: 1px solid rgba(43, 217, 255, 0.25);
            color: var(--brand-cyan);
            flex-shrink: 0;
        }

        .card-icon svg {
            width: 26px;
            height: 26px;
        }

        /* Feature list */
        .feature-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 1rem;
        }

        .feature-list li {
            list-style: none;
            font-size: 0.85rem;
            color: var(--text-mid);
            padding: 5px 12px;
            border-radius: 999px;
            background: rgba(255, 255, 255, 0.04);
            border: 1px solid rgba(255, 255, 255, 0.07);
            transition: border-color 0.2s;
        }

        .glass-card:hover .feature-list li {
            border-color: rgba(43, 217, 255, 0.2);
        }

        /* Stats */
        .stat-num {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--brand-lime);
            line-height: 1.1;
        }

        @media (min-width: 768px) {
            .stat-num {
                font-size: 3.5rem;
            }
        }

        .stat-label {
            margin-top: 0.5rem;
            color: var(--text-mid);
            font-size: 0.95rem;
        }

        .stat-divider {
            border-left: 1px solid rgba(255, 255, 255, 0.08);
        }

        /* Badge pill */
        .badge-pill {
            display: inline-block;
            padding: 4px 12px;
            border-radius: 999px;
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--brand-cyan);
            background: rgba(43, 217, 255, 0.08);
            border: 1px solid rgba(43, 217, 255, 0.2);
        }

        /* Process */
        .process-wrap {
            position: relative;
        }

        .step-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: linear-gradient(135deg, rgba(46, 107, 255, 0.3), rgba(43, 217, 255, 0.2));
            border: 1px solid rgba(43, 217, 255, 0.4);
            font-size: 1.25rem;
            font-weight: 800;
            color: var(--brand-cyan);
            box-shadow: 0 0 20px rgba(43, 217, 255, 0.2);
            position: relative;
            z-index: 2;
        }

        .process-line {
            position: absolute;
            top: 32px;
            left: 0;
            right: 0;
            height: 2px;
            background: linear-gradient(90deg, rgba(43, 217, 255, 0.35), rgba(43, 217, 255, 0.05));
            display: none;
        }

        @media (min-width: 768px) {
            .process-line {
                display: block;
            }
        }

        @media (max-width: 767px) {
            .process-wrap {
                margin-left: 24px;
            }
            .process-line {
                top: 0;
                bottom: 0;
                left: -24px;
                width: 2px;
                height: auto;
                background: linear-gradient(180deg, rgba(43, 217, 255, 0.35), rgba(43, 217, 255, 0.05));
            }
            .step-num {
                width: 52px;
                height: 52px;
                font-size: 1rem;
            }
        }

        /* Download card */
        .download-card {
            display: flex;
            align-items: center;
            gap: 16px;
            padding: 24px;
            transition: transform 0.25s, border-color 0.25s;
        }

        .download-card:hover {
            transform: translateY(-3px);
            border-color: rgba(43, 217, 255, 0.35);
        }

        .download-icon {
            width: 48px;
            height: 48px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(201, 245, 66, 0.08);
            border: 1px solid rgba(201, 245, 66, 0.2);
            color: var(--brand-lime);
            flex-shrink: 0;
        }

        .download-icon svg {
            width: 22px;
            height: 22px;
        }

        /* FAQ */
        .faq-item {
            margin-bottom: 0.75rem;
        }

        .faq-q {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 20px 24px;
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: 16px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-high);
            transition: border-color 0.2s, background 0.2s;
            text-align: left;
        }

        .faq-q:hover {
            border-color: rgba(43, 217, 255, 0.3);
        }

        .faq-icon {
            width: 28px;
            height: 28px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            background: rgba(43, 217, 255, 0.1);
            color: var(--brand-cyan);
            flex-shrink: 0;
            transition: transform 0.3s;
        }

        .faq-icon svg {
            width: 14px;
            height: 14px;
        }

        .faq-item.open .faq-icon {
            transform: rotate(45deg);
        }

        .faq-a {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease, border-color 0.3s;
            padding: 0 24px;
            border-left: 2px solid transparent;
            color: var(--text-mid);
            line-height: 1.9;
            font-size: 0.95rem;
        }

        .faq-item.open .faq-a {
            max-height: 420px;
            padding: 16px 24px 20px;
            border-left-color: var(--brand-cyan);
        }

        /* CTA panel */
        .cta-panel {
            position: relative;
            padding: 4rem 1.5rem;
            text-align: center;
            border-radius: 32px;
            background: linear-gradient(135deg, rgba(46, 107, 255, 0.15), rgba(43, 217, 255, 0.08));
            border: 1px solid rgba(43, 217, 255, 0.2);
            overflow: hidden;
        }

        .cta-panel::before {
            content: "";
            position: absolute;
            top: -60%;
            left: 50%;
            transform: translateX(-50%);
            width: 600px;
            height: 600px;
            background: radial-gradient(circle, rgba(43, 217, 255, 0.18), transparent 70%);
            pointer-events: none;
        }

        .cta-panel .container-x {
            position: relative;
            z-index: 2;
        }

        /* Footer */
        .footer-bg {
            background: #070E1A;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }

        /* Mobile tabbar */
        .mobile-tabbar {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            height: 64px;
            background: rgba(10, 18, 32, 0.88);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            z-index: 60;
            display: flex;
            align-items: center;
            justify-content: space-around;
            padding-bottom: env(safe-area-inset-bottom);
        }

        @media (min-width: 768px) {
            .mobile-tabbar {
                display: none;
            }
        }

        .tab-item {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 3px;
            flex: 1;
            height: 100%;
            color: var(--text-low);
            font-size: 0.7rem;
            font-weight: 500;
            position: relative;
            transition: color 0.2s;
        }

        .tab-item svg {
            width: 22px;
            height: 22px;
        }

        .tab-item:hover {
            color: var(--text-mid);
        }

        .tab-item.active {
            color: var(--brand-cyan);
        }

        .tab-item.active::before {
            content: "";
            position: absolute;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 36px;
            height: 2px;
            background: var(--brand-cyan);
            border-radius: 2px;
            box-shadow: 0 0 8px rgba(43, 217, 255, 0.5);
        }

        /* Conversion bar */
        .conversion-bar {
            position: fixed;
            left: 0;
            right: 0;
            z-index: 56;
            background: rgba(13, 26, 47, 0.94);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            transform: translateY(110%);
            transition: transform 0.35s ease;
            padding-bottom: env(safe-area-inset-bottom);
        }

        .conversion-bar.show {
            transform: translateY(0);
        }

        @media (max-width: 767px) {
            .conversion-bar {
                bottom: 64px;
                height: 56px;
            }
        }

        @media (min-width: 768px) {
            .conversion-bar {
                bottom: 0;
                height: 64px;
            }
        }

        .close-bar {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            border: 1px solid rgba(255, 255, 255, 0.15);
            color: var(--text-mid);
            background: transparent;
            font-size: 1rem;
            transition: background 0.2s, color 0.2s;
            flex-shrink: 0;
        }

        .close-bar:hover {
            background: rgba(255, 255, 255, 0.1);
            color: #fff;
        }

        /* Focus accessibility */
        a:focus-visible,
        button:focus-visible {
            outline: 2px solid var(--brand-cyan);
            outline-offset: 3px;
            border-radius: 6px;
        }

/* roulang page: category2 */
:root {
            --bg-void: #0A1220;
            --bg-deep: #0D1A2F;
            --brand-blue: #2E6BFF;
            --brand-cyan: #2BD9FF;
            --brand-lime: #C9F542;
            --text-high: #F1F6FE;
            --text-mid: #9FB0C3;
            --text-low: #61748A;
            --glass-bg: rgba(255, 255, 255, 0.05);
            --glass-border: rgba(255, 255, 255, 0.09);
            --radius-card: 24px;
            --radius-btn: 999px;
            --shadow-glow: 0 0 42px rgba(43, 217, 255, 0.35);
        }
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: "Inter", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
            background: var(--bg-void);
            color: var(--text-high);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            padding-bottom: 64px;
        }
        @media (min-width: 768px) {
            body {
                padding-bottom: 96px;
            }
        }
        a {
            text-decoration: none;
            color: inherit;
        }
        img {
            max-width: 100%;
            display: block;
        }
        button {
            font-family: inherit;
            cursor: pointer;
        }
        input {
            font-family: inherit;
        }
        .container-x {
            max-width: 80rem;
            margin: 0 auto;
            padding-left: 1rem;
            padding-right: 1rem;
        }
        @media (min-width: 768px) {
            .container-x {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }
        .section-pad {
            padding-top: 5rem;
            padding-bottom: 5rem;
        }
        @media (min-width: 768px) {
            .section-pad {
                padding-top: 8rem;
                padding-bottom: 8rem;
            }
        }
        .header-glass {
            background: rgba(10, 18, 32, 0.78);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            transition: background 0.3s ease, box-shadow 0.3s ease;
        }
        .header-glass.scrolled {
            background: rgba(10, 18, 32, 0.92);
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
        }
        .logo-icon {
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: linear-gradient(135deg, rgba(46, 107, 255, 0.35), rgba(43, 217, 255, 0.25));
            border: 1px solid rgba(43, 217, 255, 0.35);
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 0 18px rgba(43, 217, 255, 0.25);
            flex-shrink: 0;
        }
        .logo-text {
            font-weight: 800;
            font-size: 1.35rem;
            letter-spacing: -0.01em;
            color: var(--text-high);
            background: linear-gradient(90deg, #f1f6fe, #c9f542);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .nav-link {
            position: relative;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-mid);
            padding: 0.5rem 0.25rem;
            transition: color 0.25s ease;
            letter-spacing: 0.02em;
        }
        .nav-link:hover {
            color: var(--text-high);
        }
        .nav-link.active {
            color: var(--text-high);
            font-weight: 600;
        }
        .nav-link.active::after {
            content: '';
            position: absolute;
            left: 0;
            right: 0;
            bottom: -2px;
            height: 2px;
            border-radius: 2px;
            background: linear-gradient(90deg, var(--brand-cyan), var(--brand-blue));
            box-shadow: 0 0 8px rgba(43, 217, 255, 0.6);
        }
        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background: linear-gradient(135deg, #2E6BFF, #2BD9FF);
            color: #fff;
            font-weight: 700;
            border-radius: var(--radius-btn);
            padding: 14px 32px;
            font-size: 0.95rem;
            box-shadow: var(--shadow-glow);
            transition: all 0.3s ease;
            border: none;
            line-height: 1.2;
            white-space: nowrap;
        }
        .btn-primary:hover {
            filter: brightness(1.12);
            box-shadow: 0 0 52px rgba(43, 217, 255, 0.5);
            transform: scale(1.02);
        }
        .btn-primary:active {
            transform: scale(0.98);
        }
        .btn-secondary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background: var(--glass-bg);
            border: 1px solid rgba(255, 255, 255, 0.15);
            color: var(--text-high);
            font-weight: 600;
            border-radius: var(--radius-btn);
            padding: 14px 32px;
            font-size: 0.95rem;
            backdrop-filter: blur(12px);
            transition: all 0.25s ease;
            white-space: nowrap;
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.25);
            transform: translateY(-2px);
        }
        .glass-card {
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-card);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.18);
            position: relative;
            transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
        }
        .glass-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 2px;
            height: 48px;
            border-radius: 2px;
            background: linear-gradient(to bottom, var(--brand-cyan), transparent);
        }
        .glass-card:hover {
            transform: translateY(-3px);
            border-color: rgba(43, 217, 255, 0.25);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.25), 0 0 24px rgba(43, 217, 255, 0.08);
        }
        .grid-texture {
            background-image: linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
            background-size: 48px 48px;
        }
        .section-title {
            position: relative;
            padding-left: 56px;
            font-weight: 700;
            font-size: 1.75rem;
            line-height: 1.3;
            color: var(--text-high);
        }
        @media (min-width: 768px) {
            .section-title {
                font-size: 2.25rem;
                padding-left: 64px;
            }
        }
        .section-title::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 40px;
            height: 4px;
            border-radius: 4px;
            background: linear-gradient(to right, var(--brand-cyan), transparent);
        }
        .section-tag {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.12em;
            text-transform: uppercase;
            color: var(--brand-cyan);
            background: rgba(43, 217, 255, 0.08);
            border: 1px solid rgba(43, 217, 255, 0.2);
            padding: 6px 16px;
            border-radius: 999px;
            margin-bottom: 1.25rem;
        }
        .text-gradient {
            background: linear-gradient(90deg, #2BD9FF, #C9F542);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        /* Hero */
        .hero-section {
            position: relative;
            min-height: 78vh;
            display: flex;
            align-items: center;
            padding-top: 7rem;
            padding-bottom: 5rem;
            overflow: hidden;
        }
        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.webp');
            background-size: cover;
            background-position: center;
            opacity: 0.35;
            z-index: -2;
        }
        .hero-section::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(10, 18, 32, 0.96) 30%, rgba(13, 26, 47, 0.8) 70%, rgba(10, 18, 32, 0.7));
            z-index: -1;
        }
        .hero-section .grid-texture {
            position: absolute;
            inset: 0;
            z-index: -1;
        }
        .hero-section .hero-wave {
            position: absolute;
            right: -40px;
            bottom: 40px;
            width: 480px;
            height: 240px;
            opacity: 0.15;
            z-index: -1;
            pointer-events: none;
        }
        /* Timeline */
        .timeline-wrap {
            position: relative;
        }
        .timeline-wrap::before {
            content: '';
            position: absolute;
            top: 30px;
            left: 0;
            right: 0;
            height: 2px;
            background: linear-gradient(to right, rgba(43, 217, 255, 0.6), rgba(43, 217, 255, 0.1), rgba(43, 217, 255, 0.6));
            border-radius: 2px;
        }
        .timeline-item {
            position: relative;
            text-align: center;
            padding: 0 12px;
        }
        .timeline-node {
            width: 60px;
            height: 60px;
            margin: 0 auto;
            border-radius: 50%;
            background: var(--bg-deep);
            border: 2px solid rgba(43, 217, 255, 0.4);
            display: flex;
            align-items: center;
            justify-content: center;
            position: relative;
            z-index: 1;
            box-shadow: 0 0 20px rgba(43, 217, 255, 0.2);
            transition: all 0.3s ease;
            margin-bottom: 24px;
        }
        .timeline-item:hover .timeline-node {
            border-color: var(--brand-cyan);
            box-shadow: 0 0 32px rgba(43, 217, 255, 0.4);
            transform: scale(1.05);
        }
        .timeline-step {
            font-size: 0.75rem;
            font-weight: 700;
            letter-spacing: 0.1em;
            color: var(--brand-lime);
            margin-bottom: 6px;
        }
        @media (max-width: 767px) {
            .timeline-wrap::before {
                display: none;
            }
            .timeline-item {
                display: flex;
                gap: 16px;
                text-align: left;
                padding: 0;
            }
            .timeline-node {
                margin: 0;
                flex-shrink: 0;
                width: 48px;
                height: 48px;
            }
        }
        /* Scenario Cards */
        .scenario-card {
            display: grid;
            grid-template-columns: 1fr;
            border-radius: var(--radius-card);
            overflow: hidden;
            position: relative;
        }
        @media (min-width: 768px) {
            .scenario-card {
                grid-template-columns: 1fr 1fr;
                min-height: 360px;
            }
            .scenario-card.reversed .scenario-img {
                order: 2;
            }
            .scenario-card.reversed .scenario-body {
                order: 1;
            }
        }
        .scenario-img {
            position: relative;
            overflow: hidden;
            min-height: 240px;
        }
        .scenario-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        .scenario-card:hover .scenario-img img {
            transform: scale(1.04);
        }
        .scenario-img::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(10, 18, 32, 0.15), rgba(10, 18, 32, 0.55));
        }
        .scenario-body {
            padding: 2rem;
            display: flex;
            flex-direction: column;
            justify-content: center;
            background: rgba(13, 26, 47, 0.55);
            border-left: 1px solid rgba(255, 255, 255, 0.06);
        }
        @media (min-width: 768px) {
            .scenario-body {
                padding: 3rem;
            }
        }
        .feature-list {
            list-style: none;
            margin-top: 1rem;
        }
        .feature-list li {
            position: relative;
            padding-left: 28px;
            margin-bottom: 10px;
            font-size: 0.95rem;
            color: var(--text-mid);
            line-height: 1.7;
        }
        .feature-list li::before {
            content: '';
            position: absolute;
            left: 0;
            top: 10px;
            width: 14px;
            height: 2px;
            border-radius: 2px;
            background: var(--brand-lime);
        }
        /* Download */
        .download-card {
            text-align: center;
            padding: 2rem 1.5rem;
            transition: all 0.3s ease;
        }
        .download-card:hover {
            border-color: rgba(43, 217, 255, 0.3);
            transform: translateY(-4px);
            box-shadow: 0 16px 40px rgba(0, 0, 0, 0.25), 0 0 30px rgba(43, 217, 255, 0.08);
        }
        .download-icon {
            width: 56px;
            height: 56px;
            border-radius: 16px;
            background: rgba(46, 107, 255, 0.12);
            border: 1px solid rgba(46, 107, 255, 0.25);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
        }
        /* FAQ */
        .faq-item {
            border: 1px solid rgba(255, 255, 255, 0.07);
            border-radius: 16px;
            background: rgba(255, 255, 255, 0.02);
            margin-bottom: 12px;
            overflow: hidden;
            transition: border-color 0.3s ease, background 0.3s ease;
        }
        .faq-item.open {
            border-color: rgba(43, 217, 255, 0.2);
            background: rgba(255, 255, 255, 0.035);
        }
        .faq-btn {
            width: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            padding: 18px 20px;
            background: transparent;
            border: none;
            color: var(--text-high);
            font-size: 1rem;
            font-weight: 600;
            text-align: left;
            transition: color 0.2s ease;
        }
        .faq-btn:hover {
            color: var(--brand-cyan);
        }
        .faq-icon {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            border: 1px solid rgba(255, 255, 255, 0.15);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
            flex-shrink: 0;
            transition: all 0.35s ease;
            color: var(--brand-cyan);
        }
        .faq-item.open .faq-icon {
            transform: rotate(45deg);
            border-color: var(--brand-cyan);
            box-shadow: 0 0 12px rgba(43, 217, 255, 0.3);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 20px;
        }
        .faq-item.open .faq-answer {
            padding-bottom: 20px;
            border-left: 2px solid var(--brand-cyan);
            margin-left: 20px;
            padding-left: 20px;
        }
        .faq-answer p {
            font-size: 0.95rem;
            color: var(--text-mid);
            line-height: 1.8;
        }
        /* Footer */
        .footer-bg {
            background: #070D18;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }
        .footer-bg a {
            transition: color 0.2s ease;
        }
        .footer-bg a:hover {
            color: #fff;
        }
        /* Mobile Tab Bar */
        .mobile-tab-bar {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            height: 64px;
            background: rgba(10, 18, 32, 0.9);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            display: flex;
            align-items: center;
            z-index: 65;
        }
        @media (min-width: 768px) {
            .mobile-tab-bar {
                display: none;
            }
        }
        .mobile-tab {
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 4px;
            height: 100%;
            color: var(--text-low);
            font-size: 0.7rem;
            font-weight: 500;
            transition: color 0.2s ease;
            border: none;
            background: transparent;
        }
        .mobile-tab.active {
            color: var(--brand-cyan);
            position: relative;
        }
        .mobile-tab.active::before {
            content: '';
            position: absolute;
            top: 6px;
            left: 50%;
            transform: translateX(-50%);
            width: 42px;
            height: 42px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(43, 217, 255, 0.2), transparent 70%);
            z-index: -1;
        }
        /* CTA Bar */
        .cta-bar {
            position: fixed;
            left: 0;
            right: 0;
            bottom: 64px;
            z-index: 60;
            height: 56px;
            background: rgba(10, 18, 32, 0.88);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            transition: transform 0.4s ease;
        }
        @media (min-width: 768px) {
            .cta-bar {
                bottom: 0;
                height: 64px;
            }
        }
        .cta-bar.hidden {
            transform: translateY(120%);
        }
        .cta-bar .btn-primary {
            font-size: 0.85rem;
            padding: 9px 20px;
        }
        @media (min-width: 768px) {
            .cta-bar .btn-primary {
                font-size: 0.9rem;
                padding: 10px 26px;
            }
        }
        .cta-close {
            width: 30px;
            height: 30px;
            border-radius: 50%;
            border: 1px solid rgba(255, 255, 255, 0.1);
            background: transparent;
            color: var(--text-low);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.2s ease;
        }
        .cta-close:hover {
            color: #fff;
            border-color: rgba(255, 255, 255, 0.3);
        }
        /* CTA Section */
        .cta-section {
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 520px;
            height: 520px;
            border-radius: 50%;
            background: radial-gradient(circle, rgba(43, 217, 255, 0.15), transparent 70%);
            pointer-events: none;
        }
        .cta-section::after {
            content: '';
            position: absolute;
            inset: 0;
            background-image: linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
                linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
            background-size: 40px 40px;
            pointer-events: none;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 16px;
            border-radius: 999px;
            background: rgba(43, 217, 255, 0.08);
            border: 1px solid rgba(43, 217, 255, 0.25);
            font-size: 0.8rem;
            font-weight: 600;
            color: var(--brand-cyan);
            letter-spacing: 0.05em;
            margin-bottom: 24px;
        }
        .stat-block {
            border-left: 1px solid rgba(255, 255, 255, 0.08);
            padding-left: 24px;
        }
        .stat-block:first-child {
            border-left: none;
            padding-left: 0;
        }
        .stat-num {
            font-size: 2rem;
            font-weight: 800;
            color: var(--brand-lime);
            line-height: 1.2;
        }
        .stat-label {
            font-size: 0.85rem;
            color: var(--text-mid);
            margin-top: 4px;
        }
        @media (max-width: 767px) {
            .stat-block {
                border-left: none;
                padding-left: 0;
                text-align: center;
                padding: 16px 8px;
                border-top: 1px solid rgba(255, 255, 255, 0.06);
            }
            .stat-block:first-child {
                border-top: none;
            }
        }
        .section-divider {
            height: 1px;
            background: linear-gradient(to right, transparent, rgba(255, 255, 255, 0.08), transparent);
            max-width: 80rem;
            margin: 0 auto;
        }
        .btn-outline-download {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 24px;
            border-radius: 999px;
            border: 1px solid rgba(255, 255, 255, 0.15);
            background: transparent;
            color: var(--text-high);
            font-size: 0.85rem;
            font-weight: 500;
            transition: all 0.25s ease;
        }
        .btn-outline-download:hover {
            border-color: var(--brand-cyan);
            color: var(--brand-cyan);
            box-shadow: 0 0 16px rgba(43, 217, 255, 0.15);
            transform: translateY(-2px);
        }
        .scenario-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            border-radius: 999px;
            background: rgba(43, 217, 255, 0.08);
            border: 1px solid rgba(43, 217, 255, 0.2);
            color: var(--brand-cyan);
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 16px;
        }
        @media (min-width: 768px) {
            body {
                padding-bottom: 80px;
            }
        }
        @media (max-width: 767px) {
            body {
                padding-bottom: 128px;
            }
        }
        @media (max-width: 640px) {
            .section-title {
                font-size: 1.5rem;
                padding-left: 44px;
            }
            .section-title::before {
                width: 30px;
            }
            .timeline-node {
                width: 44px;
                height: 44px;
            }
            .timeline-step {
                font-size: 0.7rem;
            }
        }
        .scroll-indicator {
            display: inline-flex;
            flex-direction: column;
            align-items: center;
            gap: 6px;
            font-size: 0.75rem;
            color: var(--text-low);
            letter-spacing: 0.2em;
            text-transform: uppercase;
        }
        .scroll-indicator .line {
            width: 1px;
            height: 40px;
            background: linear-gradient(to bottom, var(--brand-cyan), transparent);
            animation: scrollPulse 2s ease-in-out infinite;
        }
        @keyframes scrollPulse {
            0% {
                transform: scaleY(1);
                transform-origin: top;
            }
            50% {
                transform: scaleY(0.4);
                transform-origin: top;
            }
            100% {
                transform: scaleY(1);
                transform-origin: top;
            }
        }
        .section-head {
            margin-bottom: 3rem;
        }
        @media (min-width: 768px) {
            .section-head {
                margin-bottom: 4rem;
            }
        }

/* roulang page: category3 */
:root {
            --bg-void: #0A1220;
            --bg-deep: #0D1A2F;
            --brand-blue: #2E6BFF;
            --brand-cyan: #2BD9FF;
            --brand-lime: #C9F542;
            --text-high: #F1F6FE;
            --text-mid: #9FB0C3;
            --text-low: #61748A;
            --glass-bg: rgba(255, 255, 255, 0.05);
            --glass-border: rgba(255, 255, 255, 0.09);
            --radius-card: 24px;
            --radius-btn: 999px;
            --shadow-glow: 0 0 42px rgba(43, 217, 255, 0.35);
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: "Inter", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
            background: var(--bg-void);
            color: var(--text-high);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }

        img,
        a,
        button,
        input {
            -webkit-tap-highlight-color: transparent;
        }

        a {
            text-decoration: none;
            color: inherit;
        }

        img {
            display: block;
            max-width: 100%;
            object-fit: cover;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
            font-family: inherit;
        }

        input {
            font-family: inherit;
        }

        ::selection {
            background: rgba(43, 217, 255, 0.25);
            color: #fff;
        }

        .container-x {
            max-width: 80rem;
            margin-left: auto;
            margin-right: auto;
            padding-left: 1rem;
            padding-right: 1rem;
        }

        @media (min-width: 768px) {
            .container-x {
                padding-left: 2rem;
                padding-right: 2rem;
            }
        }

        .header-glass {
            background: rgba(10, 18, 32, 0.78);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            transition: background 0.4s ease, box-shadow 0.4s ease;
        }

        .header-glass.scrolled {
            background: rgba(7, 13, 24, 0.92);
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
        }

        .logo-icon {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, rgba(46, 107, 255, 0.35), rgba(43, 217, 255, 0.25));
            border: 1px solid rgba(43, 217, 255, 0.35);
            box-shadow: 0 0 20px rgba(43, 217, 255, 0.18);
            flex-shrink: 0;
        }

        .logo-text {
            font-size: 1.25rem;
            font-weight: 800;
            letter-spacing: -0.01em;
            background: linear-gradient(120deg, #fff 20%, var(--brand-cyan) 90%);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            white-space: nowrap;
        }

        .nav-link {
            position: relative;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-mid);
            padding: 0.35rem 0;
            transition: color 0.3s ease;
        }

        .nav-link::after {
            content: "";
            position: absolute;
            left: 0;
            bottom: -2px;
            width: 100%;
            height: 2px;
            border-radius: 2px;
            background: linear-gradient(90deg, var(--brand-cyan), transparent);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.35s ease;
        }

        .nav-link:hover {
            color: var(--text-high);
        }

        .nav-link:hover::after,
        .nav-link.active::after {
            transform: scaleX(1);
        }

        .nav-link.active {
            color: #fff;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background: linear-gradient(135deg, #2E6BFF, #2BD9FF);
            color: #fff;
            font-weight: 700;
            font-size: 1rem;
            border-radius: 999px;
            padding: 14px 32px;
            box-shadow: var(--shadow-glow);
            transition: box-shadow 0.3s ease, transform 0.25s ease, filter 0.3s ease;
            border: none;
            cursor: pointer;
            white-space: nowrap;
        }

        .btn-primary:hover {
            filter: brightness(1.1);
            box-shadow: 0 0 52px rgba(43, 217, 255, 0.5);
            transform: scale(1.02);
        }

        .btn-primary:active {
            transform: scale(0.98);
        }

        .btn-ghost {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
            background: var(--glass-bg);
            border: 1px solid rgba(255, 255, 255, 0.15);
            color: var(--text-high);
            font-weight: 600;
            font-size: 1rem;
            border-radius: 999px;
            padding: 14px 28px;
            backdrop-filter: blur(16px);
            transition: background 0.3s ease, border-color 0.3s ease, transform 0.25s ease;
        }

        .btn-ghost:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.25);
            transform: translateY(-2px);
        }

        .btn-ghost:active {
            transform: translateY(0);
        }

        .glass-card {
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-card);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.18);
            transition: transform 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
            position: relative;
            overflow: hidden;
        }

        .glass-card::before {
            content: "";
            position: absolute;
            top: 0;
            left: 0;
            width: 2px;
            height: 48px;
            background: linear-gradient(to bottom, var(--brand-cyan), transparent);
            border-radius: 2px;
            opacity: 0.7;
            transition: height 0.35s ease, opacity 0.35s ease;
        }

        .glass-card:hover {
            transform: translateY(-3px);
            border-color: rgba(43, 217, 255, 0.35);
            box-shadow: 0 12px 40px rgba(43, 217, 255, 0.12);
        }

        .glass-card:hover::before {
            height: 72px;
            opacity: 1;
        }

        .section-title {
            position: relative;
            font-size: 2rem;
            font-weight: 700;
            line-height: 1.25;
            letter-spacing: -0.01em;
            padding-left: 20px;
            margin-bottom: 1rem;
        }

        .section-title::before {
            content: "";
            position: absolute;
            left: 0;
            top: 0.35em;
            width: 4px;
            height: 0.8em;
            border-radius: 4px;
            background: linear-gradient(to bottom, var(--brand-cyan), transparent);
        }

        @media (min-width: 768px) {
            .section-title {
                font-size: 2.5rem;
                padding-left: 24px;
            }
            .section-title::before {
                width: 5px;
            }
        }

        .section-desc {
            max-width: 75ch;
            color: var(--text-mid);
            font-size: 1rem;
            line-height: 1.9;
        }

        @media (min-width: 768px) {
            .section-desc {
                font-size: 1.125rem;
            }
        }

        .badge {
            display: inline-flex;
            align-items: center;
            gap: 0.35rem;
            padding: 0.3rem 0.9rem;
            font-size: 0.8rem;
            font-weight: 600;
            border-radius: 999px;
            background: rgba(43, 217, 255, 0.1);
            border: 1px solid rgba(43, 217, 255, 0.25);
            color: var(--brand-cyan);
            letter-spacing: 0.02em;
        }

        .tag {
            display: inline-flex;
            align-items: center;
            padding: 0.25rem 0.75rem;
            font-size: 0.8rem;
            font-weight: 500;
            border-radius: 999px;
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            color: var(--text-mid);
        }

        .grid-overlay {
            background-image: linear-gradient(rgba(43, 217, 255, 0.05) 1px, transparent 1px),
                linear-gradient(90deg, rgba(43, 217, 255, 0.05) 1px, transparent 1px);
            background-size: 56px 56px;
        }

        .wave-svg {
            position: absolute;
            bottom: 0;
            left: 0;
            width: 100%;
            height: 120px;
            opacity: 0.15;
            pointer-events: none;
        }

        .page-hero {
            min-height: 60vh;
            display: flex;
            align-items: center;
            padding-top: 96px;
            padding-bottom: 96px;
            position: relative;
        }

        @media (min-width: 768px) {
            .page-hero {
                min-height: 68vh;
                padding-top: 120px;
                padding-bottom: 120px;
            }
        }

        .milestone-list {
            position: relative;
            padding-left: 0;
            list-style: none;
            margin-top: 2rem;
        }

        .milestone-item {
            position: relative;
            padding-left: 32px;
            padding-bottom: 1.75rem;
        }

        .milestone-item::before {
            content: "";
            position: absolute;
            left: 7px;
            top: 6px;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--brand-lime);
            box-shadow: 0 0 12px rgba(201, 245, 66, 0.5);
            z-index: 2;
        }

        .milestone-item::after {
            content: "";
            position: absolute;
            left: 11px;
            top: 20px;
            bottom: 0;
            width: 2px;
            background: linear-gradient(to bottom, rgba(43, 217, 255, 0.4), transparent);
        }

        .milestone-item:last-child::after {
            display: none;
        }

        .milestone-year {
            font-size: 0.8rem;
            font-weight: 700;
            color: var(--brand-lime);
            letter-spacing: 0.04em;
            margin-bottom: 0.25rem;
        }

        .milestone-text {
            color: var(--text-mid);
            font-size: 0.95rem;
            line-height: 1.7;
        }

        .value-card {
            position: relative;
            padding: 2.25rem 2rem;
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: 20px;
            backdrop-filter: blur(20px);
            display: flex;
            align-items: flex-start;
            gap: 1.75rem;
            transition: background 0.35s ease, border-color 0.35s ease, transform 0.35s ease;
        }

        .value-card:hover {
            border-color: rgba(43, 217, 255, 0.35);
            background: rgba(255, 255, 255, 0.07);
            transform: translateY(-2px);
        }

        .value-num {
            font-size: 2.5rem;
            font-weight: 800;
            color: transparent;
            -webkit-text-stroke: 1px var(--brand-cyan);
            line-height: 1;
            flex-shrink: 0;
            min-width: 52px;
        }

        .value-divider {
            width: 100%;
            height: 1px;
            background: linear-gradient(90deg, rgba(43, 217, 255, 0.5), transparent 60%);
            margin: 2.5rem 0;
        }

        .download-card {
            padding: 2rem;
            background: var(--glass-bg);
            border: 1px solid var(--glass-border);
            border-radius: var(--radius-card);
            backdrop-filter: blur(20px);
            transition: border-color 0.3s ease, transform 0.3s ease, box-shadow 0.3s ease;
            height: 100%;
            display: flex;
            flex-direction: column;
        }

        .download-card:hover {
            border-color: rgba(43, 217, 255, 0.3);
            transform: translateY(-3px);
            box-shadow: 0 12px 36px rgba(43, 217, 255, 0.1);
        }

        .download-icon {
            width: 48px;
            height: 48px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(46, 107, 255, 0.15);
            border: 1px solid rgba(46, 107, 255, 0.25);
            margin-bottom: 1.25rem;
        }

        .cta-box {
            position: relative;
            overflow: hidden;
            border-radius: 36px;
            padding: 3.5rem 2rem;
            text-align: center;
            background:
                radial-gradient(ellipse at 50% 0%, rgba(43, 217, 255, 0.18), transparent 60%),
                linear-gradient(135deg, rgba(13, 26, 47, 0.9), rgba(10, 18, 32, 0.95));
            border: 1px solid rgba(43, 217, 255, 0.2);
        }

        @media (min-width: 768px) {
            .cta-box {
                padding: 5rem 3rem;
            }
        }

        .cta-box .grid-overlay {
            position: absolute;
            inset: 0;
            border-radius: inherit;
            pointer-events: none;
        }

        .footer-bg {
            background: #060C16;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }

        .footer-bg h4 {
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 0.08em;
            color: #fff;
            margin-bottom: 1rem;
        }

        .footer-bg a {
            color: var(--text-mid);
            font-size: 0.9rem;
            transition: color 0.3s ease;
        }

        .footer-bg a:hover {
            color: #fff;
        }

        .mobile-tab-bar {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 70;
            height: 64px;
            background: rgba(10, 18, 32, 0.92);
            backdrop-filter: blur(24px);
            -webkit-backdrop-filter: blur(24px);
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            display: flex;
            justify-content: space-around;
            align-items: stretch;
            padding-bottom: env(safe-area-inset-bottom);
        }

        .tab-item {
            flex: 1;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 3px;
            color: var(--text-low);
            font-size: 0.68rem;
            font-weight: 500;
            transition: color 0.3s ease;
            position: relative;
        }

        .tab-item svg {
            width: 22px;
            height: 22px;
        }

        .tab-item.active {
            color: var(--brand-cyan);
            background: radial-gradient(circle at 50% 20%, rgba(43, 217, 255, 0.15), transparent 70%);
        }

        .mobile-convert-bar {
            position: fixed;
            bottom: 64px;
            left: 0;
            right: 0;
            z-index: 65;
            height: 56px;
            background: rgba(10, 18, 32, 0.96);
            backdrop-filter: blur(20px);
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            display: flex;
            align-items: center;
            padding: 0 1rem;
            transform: translateY(100%);
            transition: transform 0.4s ease;
        }

        .mobile-convert-bar.show {
            transform: translateY(0);
        }

        .desktop-convert-bar {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 65;
            height: 64px;
            background: rgba(10, 18, 32, 0.96);
            backdrop-filter: blur(24px);
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            display: flex;
            align-items: center;
            padding: 0 1.5rem;
            transform: translateY(100%);
            transition: transform 0.4s ease;
        }

        .desktop-convert-bar.show {
            transform: translateY(0);
        }

        .close-bar {
            width: 28px;
            height: 28px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-low);
            background: rgba(255, 255, 255, 0.06);
            transition: background 0.3s ease, color 0.3s ease;
        }

        .close-bar:hover {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
        }

        .story-img-wrap {
            position: relative;
            border-radius: var(--radius-card);
            overflow: hidden;
            border: 1px solid var(--glass-border);
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
        }

        .story-img-wrap::after {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(10, 18, 32, 0.35), transparent 60%);
            pointer-events: none;
        }

        .pulse-dot {
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--brand-lime);
            box-shadow: 0 0 12px rgba(201, 245, 66, 0.7);
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0%,
            100% {
                opacity: 1;
                transform: scale(1);
            }
            50% {
                opacity: 0.6;
                transform: scale(1.4);
            }
        }

        .scroll-hint {
            position: absolute;
            right: 2rem;
            bottom: 2rem;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 0.5rem;
            color: var(--text-low);
            font-size: 0.75rem;
            letter-spacing: 0.15em;
        }

        .scroll-hint .line {
            width: 1px;
            height: 44px;
            background: linear-gradient(to bottom, var(--brand-cyan), transparent);
            animation: scrollDown 2s infinite;
        }

        @keyframes scrollDown {
            0% {
                transform: scaleY(0);
                transform-origin: top;
            }
            45% {
                transform: scaleY(1);
                transform-origin: top;
            }
            55% {
                transform: scaleY(1);
                transform-origin: bottom;
            }
            100% {
                transform: scaleY(0);
                transform-origin: bottom;
            }
        }

        .form-input {
            width: 100%;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 12px;
            padding: 0.9rem 1.1rem;
            color: var(--text-high);
            font-size: 0.95rem;
            transition: border-color 0.3s ease, box-shadow 0.3s ease;
            outline: none;
        }

        .form-input::placeholder {
            color: var(--text-low);
        }

        .form-input:focus {
            border-color: var(--brand-cyan);
            box-shadow: 0 0 0 3px rgba(43, 217, 255, 0.15);
        }

        @media (max-width: 767px) {
            body {
                padding-bottom: 8rem;
            }
            .section-title {
                font-size: 1.6rem;
            }
            .value-card {
                flex-direction: column;
                gap: 0.75rem;
                padding: 1.75rem 1.25rem;
            }
            .value-num {
                font-size: 2rem;
            }
        }

        @media (min-width: 768px) {
            body {
                padding-bottom: 6rem;
            }
            .desktop-nav {
                padding-top: 0;
            }
        }

        @media (min-width: 1024px) {
            .mobile-tab-bar,
            .mobile-convert-bar {
                display: none !important;
            }
        }