:root {
      --bg-deep: #0a0a0c;
      --bg-main: #121214;
      --bg-card: rgba(26, 26, 30, 0.72);
      --surface: #1a1a1e;
      --border: rgba(255, 255, 255, 0.07);
      --primary: #00ffca;
      --primary-dim: rgba(0, 255, 202, 0.14);
      --accent-green: #4caf50;
      --accent-green-glow: rgba(76, 175, 80, 0.45);
      --text: #f4f4f5;
      --text-muted: #9a9aa8;
      --text-dim: #6b6b78;
      --serif: "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
      --sans: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei UI", "Microsoft YaHei", system-ui, sans-serif;
      --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
      --nav-h: 72px;
    }

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

    html {
      scroll-behavior: smooth;
      scroll-padding-top: calc(var(--nav-h) + 16px);
      scrollbar-color: var(--primary-dim) var(--bg-deep);
    }

    body {
      font-family: var(--sans);
      background: var(--bg-deep);
      color: var(--text);
      line-height: 1.65;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    /* ── Snow canvas ── */
    #snow-canvas {
      position: fixed;
      inset: 0;
      width: 100%;
      height: 100%;
      pointer-events: none;
      z-index: 0;
      opacity: 0.55;
    }

    /* ── Ambient glow ── */
    .ambient {
      position: fixed;
      inset: 0;
      pointer-events: none;
      z-index: 0;
      background:
        radial-gradient(ellipse 90% 55% at 50% -15%, rgba(0, 255, 202, 0.11), transparent 55%),
        radial-gradient(ellipse 50% 40% at 0% 60%, rgba(76, 175, 80, 0.06), transparent 50%),
        radial-gradient(ellipse 45% 35% at 100% 70%, rgba(100, 140, 255, 0.05), transparent 45%);
    }

    .grain {
      position: fixed;
      inset: 0;
      pointer-events: none;
      z-index: 1;
      opacity: 0.035;
      background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    }

    /* ── Nav ── */
    .nav {
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      height: var(--nav-h);
      z-index: 100;
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 0 clamp(20px, 5vw, 48px);
      transition: background 0.4s var(--ease-out), border-color 0.4s;
      border-bottom: 1px solid transparent;
    }

    .nav.scrolled {
      background: rgba(10, 10, 12, 0.82);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-color: var(--border);
    }

    .nav-brand {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
      color: var(--text);
    }

    .nav-brand img {
      width: 36px;
      height: 36px;
      border-radius: 10px;
      object-fit: cover;
    }

    .nav-brand span {
      font-family: var(--serif);
      font-weight: 700;
      font-size: 1.15rem;
      letter-spacing: 0.12em;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: clamp(16px, 3vw, 36px);
      list-style: none;
    }

    .nav-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.88rem;
      font-weight: 500;
      letter-spacing: 0.04em;
      transition: color 0.25s;
    }

    .nav-links a:hover { color: var(--primary); }

    .nav-links a.is-active:not(.nav-cta) {
      color: var(--primary);
    }

    .nav-cta.is-active {
      box-shadow:
        0 0 32px var(--accent-green-glow),
        0 0 0 2px rgba(255, 255, 255, 0.25);
    }

    .nav-cta {
      padding: 10px 22px;
      background: var(--accent-green);
      color: #fff !important;
      border-radius: 999px;
      font-weight: 600 !important;
      box-shadow: 0 0 28px var(--accent-green-glow);
      transition: transform 0.25s, box-shadow 0.25s !important;
    }

    .nav-cta:hover {
      transform: translateY(-1px);
      box-shadow: 0 4px 32px var(--accent-green-glow);
      color: #fff !important;
    }

    .nav-toggle {
      display: none;
      background: none;
      border: none;
      color: var(--text);
      cursor: pointer;
      padding: 8px;
    }

    /* ── Layout ── */
    main {
      position: relative;
      z-index: 2;
      overflow-x: clip;
    }

    section {
      padding: clamp(72px, 12vw, 140px) clamp(20px, 5vw, 48px);
      max-width: 1280px;
      margin: 0 auto;
    }

    .section-label {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      font-size: 0.75rem;
      font-weight: 600;
      letter-spacing: 0.2em;
      text-transform: uppercase;
      color: var(--primary);
      margin-bottom: 20px;
    }

    .section-label::before {
      content: "";
      width: 32px;
      height: 1px;
      background: linear-gradient(90deg, var(--primary), transparent);
    }

    .section-title {
      font-family: var(--serif);
      font-size: clamp(2rem, 5vw, 3.25rem);
      font-weight: 700;
      line-height: 1.25;
      letter-spacing: 0.04em;
      margin-bottom: 20px;
    }

    .section-desc {
      color: var(--text-muted);
      font-size: clamp(0.95rem, 1.8vw, 1.1rem);
      max-width: 560px;
      font-weight: 300;
    }

    /* ── Hero ── */
    .hero {
      min-height: 100vh;
      max-width: none;
      padding: 0;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      text-align: center;
      position: relative;
      padding-top: var(--nav-h);
    }

    .hero-inner {
      padding: clamp(48px, 8vh, 100px) clamp(20px, 5vw, 48px) clamp(80px, 10vh, 120px);
      max-width: 920px;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 8px 18px;
      border: 1px solid var(--border);
      border-radius: 999px;
      background: var(--bg-card);
      backdrop-filter: blur(8px);
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      opacity: 0;
      animation: fadeUp 0.9s var(--ease-out) 0.2s forwards;
    }

    .hero-badge .dot {
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--accent-green);
      box-shadow: 0 0 10px var(--accent-green);
      animation: pulse 2s ease-in-out infinite;
    }

    @keyframes pulse {
      0%, 100% { opacity: 1; }
      50% { opacity: 0.4; }
    }

    .hero-logo {
      width: clamp(88px, 14vw, 128px);
      height: clamp(88px, 14vw, 128px);
      border-radius: 28px;
      margin: 0 auto 32px;
      box-shadow:
        0 0 0 1px rgba(255, 255, 255, 0.08),
        0 24px 80px rgba(0, 0, 0, 0.6),
        0 0 60px rgba(0, 255, 202, 0.12);
      opacity: 0;
      animation: fadeUp 1s var(--ease-out) 0.35s forwards;
    }

    .hero h1 {
      font-family: var(--serif);
      font-size: clamp(3.2rem, 10vw, 6.5rem);
      font-weight: 900;
      line-height: 1.15;
      letter-spacing: 0.08em;
      margin: 0 0 8px;
      padding-bottom: 0.12em;
      display: block;
      width: 100%;
      max-width: 100%;
      text-align: center;
      text-indent: 0.08em;
      background: linear-gradient(165deg, #fff 0%, #fff 45%, rgba(0, 255, 202, 0.85) 100%);
      -webkit-background-clip: text;
      background-clip: text;
      -webkit-text-fill-color: transparent;
      -webkit-box-decoration-break: clone;
      box-decoration-break: clone;
      opacity: 0;
      animation: fadeUp 1s var(--ease-out) 0.5s forwards;
    }

    .hero-sub {
      font-size: clamp(1rem, 2.2vw, 1.35rem);
      color: var(--text-muted);
      font-weight: 300;
      max-width: 640px;
      margin: 0 auto 16px;
      line-height: 1.75;
      opacity: 0;
      animation: fadeUp 1s var(--ease-out) 0.65s forwards;
    }

    .hero-tagline {
      font-size: clamp(0.85rem, 1.6vw, 1rem);
      color: var(--text-dim);
      max-width: 520px;
      margin: 0 auto 48px;
      font-weight: 400;
      letter-spacing: 0.06em;
      opacity: 0;
      animation: fadeUp 1s var(--ease-out) 0.75s forwards;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      justify-content: center;
      opacity: 0;
      animation: fadeUp 1s var(--ease-out) 0.9s forwards;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 10px;
      padding: 16px 36px;
      border-radius: 14px;
      font-family: var(--sans);
      font-size: 1rem;
      font-weight: 600;
      letter-spacing: 0.08em;
      text-decoration: none;
      cursor: pointer;
      border: none;
      transition: transform 0.3s var(--ease-out), box-shadow 0.3s;
    }

    .btn-primary {
      background: linear-gradient(135deg, #4caf50 0%, #388e3c 100%);
      color: #fff;
      box-shadow: 0 8px 40px var(--accent-green-glow);
    }

    .btn-primary:hover {
      transform: translateY(-3px);
      box-shadow: 0 12px 48px var(--accent-green-glow);
    }

    .btn-ghost {
      background: transparent;
      color: var(--text);
      border: 1px solid var(--border);
    }

    .btn-ghost:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }

    .hero-scroll {
      position: absolute;
      bottom: 40px;
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 8px;
      color: var(--text-dim);
      font-size: 0.7rem;
      letter-spacing: 0.15em;
      opacity: 0;
      animation: fadeUp 1s var(--ease-out) 1.2s forwards;
    }

    .hero-scroll .line {
      width: 1px;
      height: 48px;
      background: linear-gradient(180deg, var(--primary), transparent);
      animation: scrollLine 2s ease-in-out infinite;
    }

    @keyframes scrollLine {
      0%, 100% { transform: scaleY(0.3); opacity: 0.3; transform-origin: top; }
      50% { transform: scaleY(1); opacity: 1; }
    }

    @keyframes fadeUp {
      from { opacity: 0; transform: translateY(28px); }
      to { opacity: 1; transform: translateY(0); }
    }

    /* ── Workflow ── */
    .workflow { max-width: 1280px; }

    .workflow-track {
      display: grid;
      grid-template-columns: repeat(6, 1fr);
      gap: 12px;
      margin-top: 56px;
      position: relative;
    }

    .workflow-track::before {
      content: "";
      position: absolute;
      top: 52px;
      left: 8%;
      right: 8%;
      height: 1px;
      background: linear-gradient(90deg, transparent, var(--primary-dim), var(--primary), var(--primary-dim), transparent);
      z-index: 0;
    }

    .step-card {
      position: relative;
      z-index: 1;
      text-align: center;
      padding: 28px 12px 24px;
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: 16px;
      backdrop-filter: blur(12px);
      transition: border-color 0.35s, transform 0.35s var(--ease-out), box-shadow 0.35s;
    }

    .step-card:hover {
      border-color: rgba(0, 255, 202, 0.35);
      transform: translateY(-6px);
      box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
    }

    .step-num {
      width: 40px;
      height: 40px;
      margin: 0 auto 16px;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 12px;
      background: var(--primary-dim);
      color: var(--primary);
      font-size: 0.85rem;
      font-weight: 700;
    }

    .step-card h3 {
      font-size: 0.92rem;
      font-weight: 600;
      margin-bottom: 6px;
      letter-spacing: 0.04em;
    }

    .step-card p {
      font-size: 0.75rem;
      color: var(--text-dim);
      line-height: 1.5;
    }

    /* ── Features ── */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 56px;
    }

    .feature-card {
      padding: 36px 28px;
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: 20px;
      backdrop-filter: blur(10px);
      transition: border-color 0.35s, transform 0.4s var(--ease-out);
      position: relative;
      overflow: hidden;
    }

    .feature-card::after {
      content: "";
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      height: 2px;
      background: linear-gradient(90deg, transparent, var(--primary), transparent);
      opacity: 0;
      transition: opacity 0.35s;
    }

    .feature-card:hover {
      border-color: rgba(0, 255, 202, 0.2);
      transform: translateY(-4px);
    }

    .feature-card:hover::after { opacity: 1; }

    .feature-card.featured {
      grid-column: span 2;
      grid-row: span 1;
      background: linear-gradient(145deg, rgba(0, 255, 202, 0.06) 0%, var(--bg-card) 45%);
      border-color: rgba(0, 255, 202, 0.15);
    }

    .feature-icon {
      font-size: 1.75rem;
      margin-bottom: 20px;
      line-height: 1;
    }

    .feature-card h3 {
      font-family: var(--serif);
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 12px;
      letter-spacing: 0.04em;
    }

    .feature-card p {
      color: var(--text-muted);
      font-size: 0.9rem;
      font-weight: 300;
      line-height: 1.7;
    }

    .feature-tag {
      display: inline-block;
      margin-top: 16px;
      padding: 4px 12px;
      font-size: 0.72rem;
      font-weight: 600;
      letter-spacing: 0.1em;
      color: var(--primary);
      background: var(--primary-dim);
      border-radius: 6px;
    }

    /* ── Highlight strip ── */
    .highlight {
      max-width: none;
      padding: clamp(60px, 8vw, 100px) clamp(20px, 5vw, 48px);
    }

    .highlight-inner {
      max-width: 1280px;
      margin: 0 auto;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: clamp(40px, 6vw, 80px);
      align-items: center;
      padding: clamp(48px, 6vw, 72px);
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: 28px;
      backdrop-filter: blur(16px);
      position: relative;
      overflow: hidden;
    }

    .highlight-inner::before {
      content: "";
      position: absolute;
      width: 400px;
      height: 400px;
      right: -100px;
      top: -100px;
      background: radial-gradient(circle, rgba(0, 255, 202, 0.08), transparent 70%);
      pointer-events: none;
    }

    .highlight-content h2 {
      font-family: var(--serif);
      font-size: clamp(1.75rem, 4vw, 2.5rem);
      font-weight: 700;
      line-height: 1.3;
      margin-bottom: 20px;
      letter-spacing: 0.04em;
    }

    .highlight-content h2 em {
      font-style: normal;
      color: var(--primary);
    }

    .highlight-content p {
      color: var(--text-muted);
      font-weight: 300;
      margin-bottom: 28px;
      line-height: 1.8;
    }

    .highlight-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .highlight-list li {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      font-size: 0.92rem;
      color: var(--text-muted);
    }

    .highlight-list li::before {
      content: "▸";
      color: var(--primary);
      font-size: 0.75rem;
      margin-top: 4px;
      flex-shrink: 0;
    }

    .highlight-visual {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .mock-panel {
      padding: 24px;
      background: var(--surface);
      border: 1px solid var(--border);
      border-radius: 16px;
      font-size: 0.82rem;
    }

    .mock-panel .mock-header {
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 16px;
      color: var(--text-dim);
      font-size: 0.72rem;
      letter-spacing: 0.08em;
    }

    .mock-dots span {
      display: inline-block;
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--border);
      margin-right: 4px;
    }

    .mock-line {
      height: 8px;
      border-radius: 4px;
      background: rgba(255, 255, 255, 0.06);
      margin-bottom: 10px;
    }

    .mock-line.short { width: 60%; }
    .mock-line.accent { background: var(--primary-dim); width: 85%; }

    .mock-shots {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 8px;
      margin-top: 16px;
    }

    .mock-shot {
      aspect-ratio: 3/4;
      border-radius: 8px;
      background: linear-gradient(160deg, rgba(0, 255, 202, 0.12), rgba(255, 255, 255, 0.04));
      border: 1px solid var(--border);
      display: flex;
      align-items: flex-end;
      justify-content: center;
      padding: 6px;
      font-size: 0.65rem;
      color: var(--text-dim);
    }

    /* ── Platforms ── */
    .platforms {
      text-align: center;
    }

    .platforms .section-desc { margin: 0 auto; }

    .platform-cards {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 56px;
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .platform-card {
      padding: 40px 32px;
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: 20px;
      text-align: left;
      transition: border-color 0.35s, transform 0.35s;
    }

    .platform-card:hover {
      border-color: rgba(0, 255, 202, 0.25);
      transform: translateY(-4px);
    }

    .platform-card .plat-icon {
      width: 48px;
      height: 48px;
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .platform-card .plat-icon img,
    .platform-card .plat-icon svg {
      width: 100%;
      height: 100%;
      display: block;
    }

    .platform-card h3 {
      font-family: var(--serif);
      font-size: 1.2rem;
      margin-bottom: 10px;
    }

    .platform-card p {
      color: var(--text-muted);
      font-size: 0.88rem;
      font-weight: 300;
      line-height: 1.65;
    }

    /* ── Mobile showcase ── */
    .mobile-showcase {
      margin-top: clamp(56px, 8vw, 80px);
      padding: clamp(36px, 5vw, 52px);
      border-radius: 28px;
      border: 1px solid rgba(0, 255, 202, 0.14);
      background:
        linear-gradient(145deg, rgba(0, 255, 202, 0.05) 0%, transparent 42%),
        var(--bg-card);
      text-align: left;
    }

    .mobile-showcase__head {
      text-align: center;
      max-width: 640px;
      margin: 0 auto 40px;
    }

    .mobile-showcase__title {
      font-family: var(--serif);
      font-size: clamp(1.5rem, 3.5vw, 2rem);
      font-weight: 900;
      letter-spacing: 0.04em;
      margin: 12px 0 14px;
    }

    .mobile-showcase__desc {
      color: var(--text-muted);
      font-size: 0.92rem;
      font-weight: 300;
      line-height: 1.7;
    }

    .mobile-showcase__layout {
      display: grid;
      grid-template-columns: minmax(0, 1fr) minmax(240px, 300px);
      gap: clamp(28px, 5vw, 56px);
      align-items: center;
    }

    .mobile-tabs {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 24px;
    }

    .mobile-tab {
      padding: 8px 16px;
      border-radius: 999px;
      border: 1px solid var(--border);
      background: rgba(255, 255, 255, 0.03);
      color: var(--text-muted);
      font-family: var(--sans);
      font-size: 0.82rem;
      font-weight: 500;
      letter-spacing: 0.04em;
      cursor: pointer;
      transition: border-color 0.25s, color 0.25s, background 0.25s;
    }

    .mobile-tab:hover {
      border-color: rgba(0, 255, 202, 0.3);
      color: var(--text);
    }

    .mobile-tab.is-active {
      border-color: rgba(0, 255, 202, 0.45);
      background: rgba(0, 255, 202, 0.1);
      color: var(--primary);
    }

    .mobile-panels {
      min-height: 200px;
    }

    .mobile-panel h4 {
      font-family: var(--serif);
      font-size: 1.15rem;
      margin-bottom: 10px;
    }

    .mobile-panel p {
      color: var(--text-muted);
      font-size: 0.88rem;
      font-weight: 300;
      line-height: 1.65;
      margin-bottom: 16px;
    }

    .mobile-panel ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .mobile-panel li {
      position: relative;
      padding-left: 18px;
      font-size: 0.84rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    .mobile-panel li::before {
      content: "";
      position: absolute;
      left: 0;
      top: 0.55em;
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--primary);
      box-shadow: 0 0 8px rgba(0, 255, 202, 0.5);
    }

    .mobile-panel[hidden] {
      display: none;
    }

    .mobile-showcase__actions {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      margin-top: 28px;
    }

    .mobile-showcase__actions .btn {
      padding: 14px 28px;
      font-size: 0.92rem;
    }

    .mobile-showcase__note {
      font-size: 0.78rem;
      color: var(--text-dim);
    }

    .mobile-phone {
      position: relative;
      justify-self: center;
      width: 100%;
      max-width: 300px;
    }

    .mobile-phone__glow {
      position: absolute;
      inset: 10% -20%;
      background: radial-gradient(ellipse at 50% 50%, rgba(0, 255, 202, 0.18), transparent 65%);
      pointer-events: none;
    }

    .mobile-phone__frame {
      position: relative;
      padding: 12px 10px 14px;
      border-radius: 36px;
      background: linear-gradient(160deg, #2a2a30 0%, #141416 100%);
      border: 1px solid rgba(255, 255, 255, 0.1);
      box-shadow:
        0 24px 64px rgba(0, 0, 0, 0.55),
        0 0 0 1px rgba(255, 255, 255, 0.04) inset;
    }

    .mobile-phone__notch {
      position: absolute;
      top: 18px;
      left: 50%;
      transform: translateX(-50%);
      width: 72px;
      height: 22px;
      border-radius: 0 0 14px 14px;
      background: #0a0a0c;
      z-index: 2;
    }

    .mobile-phone__screen {
      display: block;
      width: 100%;
      height: auto;
      border-radius: 28px;
      background: #0a0a0c;
      transition: opacity 0.3s var(--ease-out);
    }

    .mobile-phone__screen.is-fading {
      opacity: 0.4;
    }

    /* ── Traffic spotlight (全平台引流) ── */
    .traffic-spotlight {
      position: relative;
      margin-top: 48px;
      padding: clamp(32px, 5vw, 48px);
      border-radius: 24px;
      border: 1px solid rgba(0, 255, 202, 0.16);
      background: linear-gradient(135deg, rgba(0, 255, 202, 0.06) 0%, rgba(26, 26, 30, 0.85) 45%, rgba(255, 36, 66, 0.04) 100%);
      overflow: hidden;
      text-align: left;
    }

    .traffic-spotlight__glow {
      position: absolute;
      inset: -40% -20% auto -20%;
      height: 70%;
      background: radial-gradient(ellipse at 30% 50%, rgba(0, 255, 202, 0.14), transparent 60%);
      pointer-events: none;
    }

    .traffic-spotlight__layout {
      position: relative;
      display: grid;
      grid-template-columns: minmax(140px, 200px) 1fr;
      gap: clamp(28px, 5vw, 56px);
      align-items: center;
    }

    .traffic-spotlight__visual {
      display: flex;
      align-items: center;
      justify-content: center;
      animation: traffic-hub-pulse 5s ease-in-out infinite;
    }

    .traffic-spotlight__visual img {
      width: 100%;
      max-width: 200px;
      height: auto;
    }

    @keyframes traffic-hub-pulse {
      0%, 100% { transform: scale(1); filter: drop-shadow(0 0 24px rgba(0, 255, 202, 0.25)); }
      50% { transform: scale(1.05); filter: drop-shadow(0 0 36px rgba(0, 255, 202, 0.38)); }
    }

    .traffic-spotlight__label {
      display: inline-block;
      font-size: 0.72rem;
      font-weight: 600;
      letter-spacing: 0.22em;
      color: var(--primary);
      margin-bottom: 12px;
      padding: 4px 12px;
      border: 1px solid rgba(0, 255, 202, 0.28);
      border-radius: 999px;
      background: rgba(0, 255, 202, 0.06);
    }

    .traffic-spotlight__content h3 {
      font-family: var(--serif);
      font-size: clamp(1.35rem, 3vw, 1.75rem);
      font-weight: 900;
      letter-spacing: 0.04em;
      margin-bottom: 12px;
      line-height: 1.35;
    }

    .traffic-spotlight__content > p {
      color: var(--text-muted);
      font-weight: 300;
      font-size: 0.95rem;
      line-height: 1.75;
      margin-bottom: 28px;
      max-width: 640px;
    }

    .traffic-platform-grid {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px;
      margin-bottom: 24px;
    }

    .traffic-platform {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      padding: 14px 16px;
      border-radius: 14px;
      background: rgba(255, 255, 255, 0.03);
      border: 1px solid var(--border);
      transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s;
    }

    .traffic-platform:hover {
      transform: translateY(-2px);
    }

    .traffic-platform--dy:hover {
      border-color: rgba(37, 244, 238, 0.35);
      box-shadow: 0 8px 24px rgba(37, 244, 238, 0.08);
    }

    .traffic-platform--ks:hover {
      border-color: rgba(255, 73, 6, 0.35);
      box-shadow: 0 8px 24px rgba(255, 73, 6, 0.08);
    }

    .traffic-platform--wx:hover {
      border-color: rgba(7, 193, 96, 0.35);
      box-shadow: 0 8px 24px rgba(7, 193, 96, 0.08);
    }

    .traffic-platform--xhs:hover {
      border-color: rgba(255, 36, 66, 0.35);
      box-shadow: 0 8px 24px rgba(255, 36, 66, 0.08);
    }

    .traffic-platform__icon {
      width: 36px;
      height: 36px;
      flex-shrink: 0;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: 10px;
      background: rgba(255, 255, 255, 0.04);
    }

    .traffic-platform__icon img {
      width: 28px;
      height: 28px;
    }

    .traffic-platform strong {
      display: block;
      font-size: 0.92rem;
      font-weight: 600;
      margin-bottom: 3px;
    }

    .traffic-platform span {
      display: block;
      font-size: 0.78rem;
      color: var(--text-dim);
      line-height: 1.45;
      font-weight: 300;
    }

    .traffic-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .traffic-tags span {
      font-size: 0.72rem;
      font-weight: 500;
      letter-spacing: 0.04em;
      padding: 5px 12px;
      border-radius: 999px;
      color: var(--text-muted);
      border: 1px solid rgba(255, 255, 255, 0.08);
      background: rgba(255, 255, 255, 0.03);
    }

    /* ── CTA ── */
    .cta-section {
      text-align: center;
      padding-bottom: clamp(100px, 14vw, 160px);
    }

    .cta-box {
      padding: clamp(56px, 8vw, 88px) clamp(32px, 6vw, 64px);
      border-radius: 32px;
      background:
        linear-gradient(160deg, rgba(0, 255, 202, 0.08) 0%, transparent 50%),
        var(--bg-card);
      border: 1px solid rgba(0, 255, 202, 0.12);
      position: relative;
      overflow: hidden;
    }

    .cta-box h2 {
      font-family: var(--serif);
      font-size: clamp(2rem, 5vw, 3rem);
      font-weight: 900;
      letter-spacing: 0.06em;
      margin-bottom: 16px;
    }

    .cta-box p {
      color: var(--text-muted);
      font-weight: 300;
      margin-bottom: 40px;
      max-width: 480px;
      margin-left: auto;
      margin-right: auto;
    }

    /* ── Access modal (WeChat VIP) ── */
    body.access-open {
      overflow: hidden;
    }

    .access-modal {
      position: fixed;
      inset: 0;
      z-index: 200;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: clamp(16px, 4vw, 32px);
    }

    .access-modal[hidden] {
      display: none;
    }

    .access-modal__backdrop {
      position: absolute;
      inset: 0;
      border: none;
      background: rgba(6, 6, 8, 0.78);
      backdrop-filter: blur(10px);
      -webkit-backdrop-filter: blur(10px);
      cursor: pointer;
    }

    .access-modal__panel {
      position: relative;
      width: min(100%, 420px);
      padding: clamp(32px, 6vw, 44px) clamp(28px, 5vw, 40px) clamp(28px, 5vw, 36px);
      border-radius: 24px;
      background: linear-gradient(165deg, rgba(32, 32, 36, 0.98) 0%, rgba(18, 18, 20, 0.98) 100%);
      border: 1px solid rgba(255, 255, 255, 0.08);
      box-shadow:
        0 24px 80px rgba(0, 0, 0, 0.55),
        0 0 0 1px rgba(255, 255, 255, 0.03) inset;
      text-align: center;
      animation: accessIn 0.35s var(--ease-out);
    }

    @keyframes accessIn {
      from {
        opacity: 0;
        transform: translateY(16px) scale(0.98);
      }
      to {
        opacity: 1;
        transform: translateY(0) scale(1);
      }
    }

    .access-modal__close {
      position: absolute;
      top: 14px;
      right: 16px;
      width: 36px;
      height: 36px;
      display: flex;
      align-items: center;
      justify-content: center;
      border: none;
      border-radius: 50%;
      background: transparent;
      color: var(--text-dim);
      font-size: 1.5rem;
      line-height: 1;
      cursor: pointer;
      transition: color 0.2s, background 0.2s;
    }

    .access-modal__close:hover {
      color: var(--text);
      background: rgba(255, 255, 255, 0.06);
    }

    .access-modal__badge {
      display: inline-block;
      margin-bottom: 16px;
      padding: 5px 14px;
      border-radius: 999px;
      border: 1px solid rgba(0, 255, 202, 0.45);
      color: var(--primary);
      font-size: 0.68rem;
      font-weight: 600;
      letter-spacing: 0.14em;
    }

    .access-modal__title {
      font-family: var(--serif);
      font-size: clamp(1.35rem, 4vw, 1.65rem);
      font-weight: 900;
      letter-spacing: 0.04em;
      margin-bottom: 10px;
    }

    .access-modal__subtitle {
      color: var(--text-muted);
      font-size: 0.9rem;
      font-weight: 300;
      margin-bottom: 28px;
      line-height: 1.6;
    }

    .access-modal__qr {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 12px;
      margin-bottom: 20px;
    }

    .access-modal__qr-frame {
      padding: 12px;
      border-radius: 16px;
      background: #fff;
      box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
    }

    .access-modal__qr-frame img {
      display: block;
      width: 180px;
      height: 180px;
      object-fit: contain;
    }

    .access-modal__qr-title {
      font-size: 0.95rem;
      font-weight: 700;
      letter-spacing: 0.04em;
    }

    .access-modal__qr-desc {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    .access-modal__note {
      font-size: 0.75rem;
      color: var(--text-dim);
      line-height: 1.5;
    }

    /* ── Footer ── */
    footer {
      position: relative;
      z-index: 2;
      border-top: 1px solid var(--border);
      padding: 32px clamp(20px, 5vw, 48px);
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      max-width: 1280px;
      margin: 0 auto;
    }

    footer .copy {
      font-size: 0.82rem;
      color: var(--text-dim);
    }

    footer .copy strong {
      font-family: var(--serif);
      color: var(--text-muted);
      font-weight: 700;
      letter-spacing: 0.08em;
    }

    footer .footer-icp a {
      color: inherit;
      text-decoration: none;
    }

    footer .footer-icp a:hover {
      color: var(--text-muted);
      text-decoration: underline;
    }

    /* ── 返回顶部 ── */
    .back-to-top {
      position: fixed;
      right: clamp(16px, 3vw, 28px);
      bottom: clamp(20px, 4vw, 32px);
      z-index: 150;
      width: 48px;
      height: 48px;
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 0;
      border: 1px solid rgba(0, 255, 202, 0.4);
      border-radius: 50%;
      background: #121214;
      color: var(--primary);
      cursor: pointer;
      appearance: none;
      -webkit-appearance: none;
      -webkit-tap-highlight-color: transparent;
      outline: none;
      box-shadow:
        0 4px 24px rgba(0, 0, 0, 0.45),
        0 0 20px rgba(0, 255, 202, 0.1);
      opacity: 0;
      visibility: hidden;
      transform: translateY(12px) translateZ(0);
      backface-visibility: hidden;
      transition:
        opacity 0.35s var(--ease-out),
        visibility 0.35s,
        transform 0.35s var(--ease-out),
        border-color 0.25s,
        box-shadow 0.25s;
    }

    .back-to-top.is-visible {
      opacity: 1;
      visibility: visible;
      transform: translateY(0) translateZ(0);
    }

    .back-to-top:hover {
      border-color: var(--primary);
      box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.5),
        0 0 32px rgba(0, 255, 202, 0.22);
      color: #fff;
    }

    .back-to-top:focus-visible {
      outline: none;
      border-color: var(--primary);
      box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.5),
        0 0 0 3px rgba(0, 255, 202, 0.28),
        0 0 32px rgba(0, 255, 202, 0.22);
    }

    .back-to-top:active {
      transform: translateY(0) scale(0.94) translateZ(0);
    }

    .back-to-top svg {
      display: block;
      width: 22px;
      height: 22px;
      shape-rendering: geometricPrecision;
    }

    /* ── 3D 产品截图展台 ── */
    .showcase {
      max-width: none;
      padding-left: 0;
      padding-right: 0;
      overflow: visible;
      padding-bottom: 40px;
    }

    .showcase-head {
      max-width: 1280px;
      margin: 0 auto;
      padding: 0 clamp(20px, 5vw, 48px);
    }

    .showcase-stage-wrap {
      position: relative;
      margin-top: 48px;
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      height: auto;
      min-height: 0;
      padding: 8px clamp(16px, 4vw, 40px) 24px;
      overflow: visible;
    }

    .showcase-stage {
      position: relative;
      display: grid;
      grid-template-columns: repeat(3, minmax(0, 1fr));
      gap: clamp(28px, 4vw, 52px);
      align-items: start;
      width: 100%;
      overflow: visible;
    }

    .showcase-glow {
      position: absolute;
      inset: 0;
      background: radial-gradient(ellipse 70% 50% at 50% 40%, rgba(0, 255, 202, 0.08), transparent 70%);
      pointer-events: none;
      filter: blur(48px);
    }

    .showcase-floor {
      display: none;
    }

    .shot {
      position: relative;
      margin: 0;
      padding: 0 0 8px;
      border: none;
      background: none;
      cursor: pointer;
      transform-origin: center center;
      transition: box-shadow 0.45s var(--ease-out), filter 0.35s;
      isolation: isolate;
      border-radius: 14px;
      overflow: visible;
      width: 100%;
      z-index: 1;
    }

    .shot:focus-visible {
      outline: 2px solid var(--primary);
      outline-offset: 6px;
    }

    .shot-inner {
      position: relative;
      display: block;
      border-radius: 14px;
      overflow: hidden;
      border: 1px solid rgba(255, 255, 255, 0.1);
      background: #0c0c0e;
      box-shadow:
        0 4px 24px rgba(0, 0, 0, 0.45),
        0 32px 80px rgba(0, 0, 0, 0.55),
        0 0 0 1px rgba(0, 255, 202, 0.06);
      transform: translateZ(0);
      transition: box-shadow 0.5s var(--ease-out);
    }

    .shot-inner picture {
      display: block;
    }

    .shot img {
      display: block;
      width: 100%;
      height: auto;
      vertical-align: middle;
      transform: scale(1.001);
    }

    .shot figcaption {
      position: relative;
      display: block;
      margin-top: 14px;
      text-align: center;
      font-size: 0.8rem;
      font-weight: 600;
      letter-spacing: 0.12em;
      color: var(--primary);
      opacity: 0.7;
      transition: opacity 0.35s;
      text-shadow: 0 2px 12px rgba(0, 0, 0, 0.8);
      white-space: nowrap;
    }

    /* 悬停/置顶：仅抬层级，不改尺寸与位姿，避免裁切 */
    .shot.is-front,
    .shot:hover,
    .shot:focus-within {
      z-index: 200 !important;
      filter: brightness(1.06);
      animation-play-state: paused;
    }

    .shot.is-front .shot-inner,
    .shot:hover .shot-inner,
    .shot:focus-within .shot-inner {
      box-shadow:
        0 8px 32px rgba(0, 0, 0, 0.5),
        0 40px 100px rgba(0, 0, 0, 0.6),
        0 0 48px rgba(0, 255, 202, 0.22);
    }

    .shot.is-front figcaption,
    .shot:hover figcaption,
    .shot:focus-within figcaption {
      opacity: 1;
    }

    /* 3×2 网格散开，互不重叠；仅保留轻透视 */
    .shot--novels {
      grid-column: 1;
      grid-row: 1;
      transform: perspective(900px) rotateX(3deg) rotateY(7deg);
    }

    .shot--hero {
      grid-column: 2;
      grid-row: 1;
      transform: perspective(900px) rotateX(4deg) rotateY(0deg);
    }

    .shot--assets {
      grid-column: 3;
      grid-row: 1;
      transform: perspective(900px) rotateX(3deg) rotateY(-7deg);
    }

    .shot--pool {
      grid-column: 1;
      grid-row: 2;
      transform: perspective(900px) rotateX(5deg) rotateY(6deg);
    }

    .shot--zhihu {
      grid-column: 2;
      grid-row: 2;
      transform: perspective(900px) rotateX(5deg) rotateY(0deg);
    }

    .shot--styles {
      grid-column: 3;
      grid-row: 2;
      transform: perspective(900px) rotateX(5deg) rotateY(-6deg);
    }

    .showcase-legend {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px 14px;
      max-width: 900px;
      margin: clamp(48px, 6vw, 72px) auto 0;
      padding: 0 clamp(20px, 5vw, 48px);
    }

    .showcase-legend span {
      font-size: 0.78rem;
      color: var(--text-muted);
      padding: 8px 16px;
      border-radius: 999px;
      border: 1px solid var(--border);
      background: var(--bg-card);
      backdrop-filter: blur(8px);
      letter-spacing: 0.06em;
    }

    .showcase-legend span em {
      font-style: normal;
      color: var(--primary);
      font-weight: 600;
    }

    /* ── Reveal on scroll ── */
    .reveal {
      opacity: 0;
      transform: translateY(32px);
      transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
    }

    .reveal.visible {
      opacity: 1;
      transform: translateY(0);
    }

    /* ── Mobile ── */
    @media (max-width: 1024px) {
      .workflow-track {
        grid-template-columns: repeat(3, 1fr);
      }
      .workflow-track::before { display: none; }
      .features-grid {
        grid-template-columns: 1fr 1fr;
      }
      .feature-card.featured { grid-column: span 2; }
      .highlight-inner { grid-template-columns: 1fr; }
      .showcase-stage {
        grid-template-columns: repeat(2, minmax(0, 1fr));
      }
      .shot--hero { grid-column: 1 / -1; grid-row: 1; }
      .shot--novels { grid-column: 1; grid-row: 2; }
      .shot--assets { grid-column: 2; grid-row: 2; }
      .shot--pool { grid-column: 1; grid-row: 3; }
      .shot--styles { grid-column: 2; grid-row: 3; }
      .shot--zhihu { grid-column: 1 / -1; grid-row: 4; max-width: 480px; justify-self: center; width: 100%; }
      .mobile-showcase__layout {
        grid-template-columns: 1fr;
      }
      .mobile-phone {
        order: -1;
        max-width: 280px;
        margin: 0 auto 12px;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-h);
        left: 0;
        right: 0;
        flex-direction: column;
        padding: 24px;
        background: rgba(10, 10, 12, 0.96);
        backdrop-filter: blur(16px);
        border-bottom: 1px solid var(--border);
        gap: 20px;
      }
      .nav-links.open { display: flex; }
      .nav-toggle { display: block; }

      .workflow-track { grid-template-columns: repeat(2, 1fr); }
      .features-grid { grid-template-columns: 1fr; }
      .feature-card.featured { grid-column: span 1; }
      .platform-cards { grid-template-columns: 1fr; }
      .mobile-showcase__layout {
        grid-template-columns: 1fr;
      }
      .mobile-phone {
        order: -1;
        max-width: 260px;
        margin: 0 auto 8px;
      }
      .traffic-spotlight__layout { grid-template-columns: 1fr; text-align: center; }
      .traffic-spotlight__visual { max-width: 160px; margin: 0 auto; }
      .traffic-spotlight__content > p { margin-left: auto; margin-right: auto; }
      .traffic-platform-grid { grid-template-columns: 1fr; }
      .traffic-platform { text-align: left; }
      .traffic-tags { justify-content: center; }
      .mock-shots { grid-template-columns: repeat(2, 1fr); }
      .showcase-stage-wrap {
        padding: 0 12px;
      }
      .showcase-stage {
        grid-template-columns: 1fr;
        gap: 36px;
        max-width: 440px;
        margin: 0 auto;
      }
      .shot--hero,
      .shot--novels,
      .shot--assets,
      .shot--pool,
      .shot--zhihu,
      .shot--styles {
        grid-column: 1;
        grid-row: auto;
        max-width: none;
        justify-self: stretch;
        transform: perspective(900px) rotateX(4deg) rotateY(0deg) !important;
      }
      .shot--novels { transform: perspective(900px) rotateX(4deg) rotateY(5deg) !important; }
      .shot--assets { transform: perspective(900px) rotateX(4deg) rotateY(-5deg) !important; }
      .shot figcaption { opacity: 0.85; }
    }

    /* ── 语言切换 & 导航布局 ── */
    .nav-end {
      display: flex;
      align-items: center;
      gap: clamp(12px, 2vw, 20px);
    }

    .lang-switch {
      display: flex;
      border: 1px solid var(--border);
      border-radius: 999px;
      overflow: hidden;
      background: var(--bg-card);
    }

    .lang-switch button {
      font-family: var(--sans);
      font-size: 0.75rem;
      font-weight: 600;
      letter-spacing: 0.06em;
      padding: 8px 14px;
      border: none;
      background: transparent;
      color: var(--text-muted);
      cursor: pointer;
      transition: background 0.25s, color 0.25s;
    }

    .lang-switch button.is-active {
      background: var(--primary-dim);
      color: var(--primary);
    }

    .lang-switch button:hover:not(.is-active) {
      color: var(--text);
    }

    body.lang-en {
      --serif: "Noto Serif SC", Georgia, "Times New Roman", serif;
      --sans: "Noto Sans SC", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    }

    /* 英文 Hero：拉丁字母下降部 + 渐变裁剪易显「压扁」，单独放宽行高与字距 */
    html[lang="en"] .hero h1,
    body.lang-en .hero h1 {
      font-family: "Noto Serif SC", Georgia, "Times New Roman", serif;
      font-weight: 700;
      font-size: clamp(2.75rem, 8.5vw, 5.25rem);
      line-height: 1.22;
      letter-spacing: 0.01em;
      text-indent: 0;
      padding-bottom: 0.18em;
      font-feature-settings: "kern" 1, "liga" 1;
      text-rendering: optimizeLegibility;
    }

    html[lang="en"] .section-title,
    body.lang-en .section-title {
      letter-spacing: 0.01em;
      line-height: 1.3;
    }

    html[lang="en"] .hero-tagline,
    body.lang-en .hero-tagline {
      letter-spacing: 0.02em;
      line-height: 1.65;
    }

    /* ── FAQ（SEO / GEO） ── */
    .faq {
      max-width: 800px;
      margin-left: auto;
      margin-right: auto;
    }

    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 20px;
      margin-top: 40px;
    }

    .faq-item {
      padding: 24px 28px;
      background: var(--bg-card);
      border: 1px solid var(--border);
      border-radius: 16px;
    }

    .faq-item h3 {
      font-family: var(--serif);
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 12px;
      letter-spacing: 0.03em;
    }

    .faq-item p {
      color: var(--text-muted);
      font-weight: 300;
      line-height: 1.75;
    }

    @media (max-width: 768px) {
      .lang-switch { order: -1; }
      .nav-end {
        gap: 8px;
      }
      .nav-links.open {
        padding-top: 16px;
      }
    }