/* === SEED TOKENS (Qoder warm-black system) === */
    :root {
      --seed-bg: #080807;
      --seed-fg: #ffffff;
      --seed-primary: #00d47b;
      --seed-surface: #0f0d0c;
      --seed-container: #171716;
      --seed-radius: 12px;
      --seed-radius-sm: 6px;

      /* Derived tokens (computed from seeds) */
      --bg: var(--seed-bg);
      --fg: var(--seed-fg);
      --primary: var(--seed-primary);
      --primary-hover: color-mix(in srgb, var(--seed-primary) 82%, #ffffff);
      --on-primary: #0f0d0c;
      --surface: var(--seed-surface);
      --container: var(--seed-container);
      --radius: var(--seed-radius);
      --radius-sm: var(--seed-radius-sm);
      --text-secondary: color-mix(in srgb, var(--seed-fg) 68%, var(--seed-bg));
      --text-tertiary: color-mix(in srgb, var(--seed-fg) 46%, var(--seed-bg));
      --text-quaternary: color-mix(in srgb, var(--seed-fg) 38%, var(--seed-bg));
      --border: color-mix(in srgb, var(--seed-fg) 16%, transparent);
      --border-tertiary: color-mix(in srgb, var(--seed-fg) 9%, transparent);
      --fill-hover: color-mix(in srgb, var(--seed-fg) 4%, transparent);
      --fill-active: color-mix(in srgb, var(--seed-fg) 8%, transparent);
      --primary-tint: color-mix(in srgb, var(--seed-primary) 10%, transparent);
      --primary-border: color-mix(in srgb, var(--seed-primary) 35%, transparent);
      --warn: #faad14;
      --error: #ff4d4f;
      --font: 'Inter', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
      --font-mono: 'JetBrains Mono', 'Cascadia Code', 'Consolas', monospace;
      --container-max: 1440px;
      --section-pad: 100px;
      --side-pad: 60px;
    }

    /* === RESET === */
    *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
    html { scroll-behavior: smooth; }
    body {
      font-family: var(--font);
      background: var(--bg);
      color: var(--fg);
      font-size: 16px;
      line-height: 22px;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
    }
    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; display: block; }
    button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }

    .container { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--side-pad); }

    /* === HEADER === */
    header {
      position: sticky; top: 0; z-index: 100;
      background: color-mix(in srgb, var(--bg) 88%, transparent);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-tertiary);
    }
    .header-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; gap: 32px; }
    .logo { display: flex; align-items: center; gap: 10px; font-size: 16px; font-weight: 500; line-height: 22px; }
    .logo-mark {
      width: 28px; height: 28px; border-radius: var(--radius-sm);
      background: var(--primary-tint);
      border: 1px solid var(--primary-border);
      display: flex; align-items: center; justify-content: center;
      color: var(--primary);
    }
    .logo-mark svg { width: 15px; height: 15px; }
    .logo .ver { font-family: var(--font-mono); font-size: 11px; font-weight: 500; color: var(--text-tertiary); margin-left: 2px; }
    nav { display: flex; align-items: center; gap: 28px; }
    nav a { font-size: 14px; font-weight: 500; line-height: 20px; color: var(--text-secondary); transition: color .2s; }
    nav a:hover { color: var(--fg); }
    .btn {
      display: inline-flex; align-items: center; justify-content: center; gap: 8px;
      padding: 8px 20px; border-radius: var(--radius-sm);
      font-size: 14px; font-weight: 500; line-height: 20px;
      transition: background .2s, border-color .2s, color .2s;
      white-space: nowrap;
    }
    .btn svg { width: 15px; height: 15px; }
    .btn-primary { background: var(--primary); color: var(--on-primary); }
    .btn-primary:hover { background: var(--primary-hover); }
    .btn-ghost { background: transparent; color: var(--fg); border: 1px solid var(--border); }
    .btn-ghost:hover { background: var(--fill-hover); border-color: color-mix(in srgb, var(--seed-fg) 28%, transparent); }
    .btn-lg { padding: 11px 28px; font-size: 15px; line-height: 20px; }
    .nav-toggle { display: none; width: 36px; height: 36px; align-items: center; justify-content: center; border-radius: var(--radius-sm); color: var(--text-secondary); }
    .nav-toggle:hover { background: var(--fill-hover); }

    /* === SECTION SCAFFOLD === */
    section { padding: var(--section-pad) 0; }
    .dashed-sep {
      width: calc(100% - 32px); max-width: var(--container-max);
      margin: 0 auto; border-bottom: 1px dashed var(--text-tertiary);
      opacity: .45;
    }
    .eyebrow {
      display: inline-flex; align-items: center; gap: 8px;
      font-family: var(--font-mono); font-size: 12px; font-weight: 500; line-height: 18px;
      letter-spacing: .08em; text-transform: uppercase;
      color: var(--primary);
      background: var(--primary-tint);
      border: 1px solid var(--primary-border);
      border-radius: 9999px; padding: 2px 12px;
      margin-bottom: 20px;
    }
    .section-head { margin-bottom: 48px; }
    .section-head h2 { font-size: 32px; font-weight: 500; line-height: 42px; letter-spacing: -0.2px; }
    .section-head p { margin-top: 12px; font-size: 16px; line-height: 24px; color: var(--text-secondary); max-width: 640px; }
    .section-head.center { text-align: center; }
    .section-head.center p { margin-left: auto; margin-right: auto; }

    /* === HERO === */
    .hero { padding: 96px 0 80px; }
    .hero-grid { display: grid; grid-template-columns: minmax(0, 560px) minmax(0, 1fr); gap: 64px; align-items: center; }
    .hero h1 { font-size: 44px; font-weight: 500; line-height: 60px; letter-spacing: -0.24px; }
    .hero h1 em { font-style: normal; color: var(--primary); }
    .hero-sub { margin-top: 20px; font-size: 16px; line-height: 26px; color: var(--text-secondary); max-width: 520px; }
    .hero-ctas { margin-top: 32px; display: flex; gap: 12px; flex-wrap: wrap; }
    .hero-meta { margin-top: 28px; display: flex; gap: 24px; flex-wrap: wrap; }
    .hero-meta span { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; line-height: 20px; color: var(--text-tertiary); }
    .hero-meta svg { width: 14px; height: 14px; color: var(--primary); }
    .hero-shot {
      border: 1px solid var(--border);
      border-radius: var(--radius);
      background: var(--surface);
      overflow: hidden;
    }
    .shot-bar {
      display: flex; align-items: center; gap: 6px;
      padding: 10px 14px;
      border-bottom: 1px solid var(--border-tertiary);
      background: var(--container);
    }
    .shot-bar i { width: 10px; height: 10px; border-radius: 50%; background: var(--fill-active); }
    .shot-bar i:first-child { background: color-mix(in srgb, var(--error) 70%, transparent); }
    .shot-bar span { margin-left: 8px; font-family: var(--font-mono); font-size: 11px; color: var(--text-tertiary); }
    .hero-shot img { width: 100%; height: auto; }

    /* === FEATURES (2-col hairline grid) === */
    .feature-grid {
      display: grid; grid-template-columns: repeat(2, 1fr);
      border: 1px solid var(--border-tertiary);
      border-radius: var(--radius);
      overflow: hidden;
    }
    .feature-cell {
      background: var(--surface);
      padding: 28px 44px;
      position: relative;
      border-top: 1px solid var(--border-tertiary);
    }
    .feature-cell:nth-child(-n+2) { border-top: none; }
    .feature-cell:nth-child(even) { border-left: 1px solid var(--border-tertiary); }
    .feature-cell .f-icon {
      width: 36px; height: 36px; border-radius: var(--radius-sm);
      background: var(--primary-tint); color: var(--primary);
      display: flex; align-items: center; justify-content: center;
      margin-bottom: 16px;
    }
    .feature-cell .f-icon svg { width: 18px; height: 18px; }
    .feature-cell h3 { font-size: 20px; font-weight: 500; line-height: 28px; }
    .feature-cell p { margin-top: 8px; font-size: 14px; line-height: 22px; color: var(--text-secondary); max-width: 560px; }
    .feature-cell .f-tag {
      position: absolute; top: 28px; right: 44px;
      font-family: var(--font-mono); font-size: 11px; font-weight: 500;
      color: var(--text-quaternary);
    }

    /* === SCREENSHOTS === */
    .shots-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .shot-card {
      border: 1px solid var(--border-tertiary);
      border-radius: var(--radius);
      background: var(--surface);
      overflow: hidden;
      transition: border-color .25s;
    }
    .shot-card:hover { border-color: var(--border); }
    .shot-card img { width: 100%; height: auto; border-bottom: 1px solid var(--border-tertiary); }
    .shot-card figcaption {
      display: flex; align-items: center; justify-content: space-between; gap: 8px;
      padding: 12px 16px;
      font-size: 13px; line-height: 20px; font-weight: 500; color: var(--text-secondary);
    }
    .shot-card figcaption code { font-family: var(--font-mono); font-size: 11px; color: var(--text-quaternary); }

    /* === PRICING === */
    .pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .price-card {
      background: var(--surface);
      border: 1px solid var(--border-tertiary);
      border-radius: var(--radius);
      padding: 28px;
      display: flex; flex-direction: column;
      transition: border-color .25s;
    }
    .price-card:hover { border-color: var(--border); }
    .price-card.featured { border-color: var(--primary-border); background: color-mix(in srgb, var(--seed-primary) 4%, var(--seed-surface)); }
    .price-top { display: flex; align-items: center; justify-content: space-between; margin-bottom: 16px; }
    .price-name { font-size: 16px; font-weight: 500; line-height: 22px; }
    .price-flag {
      font-size: 11px; font-weight: 500; line-height: 18px;
      color: var(--on-primary); background: var(--primary);
      border-radius: 9999px; padding: 1px 10px;
    }
    .price-value { font-size: 40px; font-weight: 600; line-height: 48px; letter-spacing: -0.24px; }
    .price-value small { font-size: 14px; font-weight: 400; color: var(--text-tertiary); letter-spacing: 0; }
    .price-desc { margin-top: 6px; font-size: 13px; line-height: 20px; color: var(--text-tertiary); }
    .price-list { list-style: none; margin: 20px 0 24px; flex: 1; }
    .price-list li {
      display: flex; gap: 10px; align-items: flex-start;
      padding: 8px 0; font-size: 14px; line-height: 20px; color: var(--text-secondary);
      border-bottom: 1px dashed var(--border-tertiary);
    }
    .price-list li:last-child { border-bottom: none; }
    .price-list svg { width: 15px; height: 15px; color: var(--primary); flex-shrink: 0; margin-top: 2px; }
    .price-card .btn { width: 100%; }
    .pricing-note { margin-top: 20px; font-size: 13px; line-height: 20px; color: var(--text-tertiary); text-align: center; }

    /* === PURCHASE BAND === */
    .buy-band {
      border: 1px solid var(--border-tertiary);
      border-radius: var(--radius);
      background: var(--surface);
      padding: 40px 44px;
      display: flex; align-items: center; justify-content: space-between; gap: 32px;
      flex-wrap: wrap;
    }
    .buy-band h3 { font-size: 24px; font-weight: 500; line-height: 32px; }
    .buy-band p { margin-top: 8px; font-size: 14px; line-height: 22px; color: var(--text-secondary); max-width: 560px; }
    .buy-actions { display: flex; flex-direction: column; gap: 10px; align-items: stretch; min-width: 260px; }
    .buy-qq { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; line-height: 20px; color: var(--text-secondary); justify-content: center; }
    .buy-qq svg { width: 14px; height: 14px; color: var(--primary); }
    .buy-qq b { color: var(--fg); font-weight: 500; font-family: var(--font-mono); }

    /* === DOWNLOAD === */
    .download-box {
      border: 1px solid var(--border-tertiary);
      border-radius: var(--radius);
      background: var(--surface);
      padding: 56px 44px;
      text-align: center;
    }
    .download-box h2 { font-size: 28px; font-weight: 500; line-height: 40px; }
    .download-box > p { margin: 12px auto 28px; font-size: 15px; line-height: 24px; color: var(--text-secondary); max-width: 520px; }
    .dl-meta { margin-top: 16px; font-family: var(--font-mono); font-size: 12px; color: var(--text-tertiary); }
    .sys-req { margin-top: 24px; display: flex; justify-content: center; gap: 28px; flex-wrap: wrap; }
    .sys-req span { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; line-height: 20px; color: var(--text-secondary); }
    .sys-req svg { width: 14px; height: 14px; color: var(--text-tertiary); }

    /* === DOCS === */
    .docs-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
    .docs-card {
      border: 1px solid var(--border-tertiary);
      border-radius: var(--radius);
      background: var(--surface);
      padding: 24px;
      display: flex; flex-direction: column;
      transition: border-color .25s;
    }
    .docs-card:hover { border-color: var(--border); }
    .docs-card .d-icon {
      width: 32px; height: 32px; border-radius: var(--radius-sm);
      background: var(--fill-active); color: var(--text-secondary);
      display: flex; align-items: center; justify-content: center; margin-bottom: 14px;
    }
    .docs-card .d-icon svg { width: 16px; height: 16px; }
    .docs-card h3 { font-size: 16px; font-weight: 500; line-height: 22px; }
    .docs-card p { margin-top: 6px; font-size: 13px; line-height: 20px; color: var(--text-secondary); flex: 1; }
    .docs-link { margin-top: 14px; display: inline-flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 500; color: var(--primary); }
    .docs-link svg { width: 13px; height: 13px; transition: transform .2s; }
    .docs-card:hover .docs-link svg { transform: translateX(3px); }

    /* === FOOTER === */
    footer { border-top: 1px solid var(--border-tertiary); padding: 40px 0; }
    .footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
    .footer-brand { display: flex; align-items: center; gap: 12px; font-size: 14px; font-weight: 500; }
    .footer-brand .ver { font-family: var(--font-mono); font-size: 11px; color: var(--text-quaternary); border: 1px solid var(--border-tertiary); border-radius: 4px; padding: 1px 6px; }
    .footer-links { display: flex; gap: 24px; font-size: 13px; color: var(--text-secondary); flex-wrap: wrap; align-items: center; }
    .footer-links a:hover { color: var(--fg); }
    .footer-qq { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--text-secondary); }
    .footer-qq svg { width: 14px; height: 14px; color: var(--primary); }
    .footer-copy { margin-top: 24px; font-size: 12px; line-height: 18px; color: var(--text-quaternary); text-align: center; }

    /* === REVEAL === */
    .reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
    .reveal.in { opacity: 1; transform: none; }
    @media (prefers-reduced-motion: reduce) {
      .reveal { opacity: 1; transform: none; transition: none; }
      html { scroll-behavior: auto; }
    }

    /* === RESPONSIVE === */
    @media (max-width: 1280px) {
      :root { --side-pad: 32px; --section-pad: 75px; }
      .hero-grid { grid-template-columns: 1fr; gap: 48px; }
    }
    @media (max-width: 900px) {
      .shots-grid, .docs-grid { grid-template-columns: repeat(2, 1fr); }
      .pricing-grid { grid-template-columns: 1fr; max-width: 480px; margin: 0 auto; }
      .feature-grid { grid-template-columns: 1fr; }
      .feature-cell:nth-child(even) { border-left: none; }
      .feature-cell:nth-child(-n+2) { border-top: 1px solid var(--border-tertiary); }
      .feature-cell:first-child { border-top: none; }
      .feature-cell { padding: 24px 28px; }
      .feature-cell .f-tag { right: 28px; top: 24px; }
    }
    @media (max-width: 768px) {
      :root { --side-pad: 22px; --section-pad: 60px; }
      nav { display: none; }
      .nav-toggle { display: flex; }
      nav.open {
        display: flex; flex-direction: column; align-items: flex-start;
        position: absolute; top: 60px; left: 0; right: 0;
        background: var(--bg); border-bottom: 1px solid var(--border-tertiary);
        padding: 16px 22px; gap: 16px;
      }
      .hero { padding: 60px 0; }
      .hero h1 { font-size: 32px; line-height: 42px; }
      .shots-grid, .docs-grid { grid-template-columns: 1fr; }
      .buy-band { padding: 28px 22px; }
      .download-box { padding: 40px 22px; }
    }