/* ============================================================
       MockLLM — Premium Light Editorial Design System
       Fonts: Fraunces (display) · Plus Jakarta Sans (UI) · JetBrains Mono (code)
       ============================================================ */

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

    :root {
      /* Surfaces — warm-tinted paper, never pure white/black */
      --paper:        oklch(98.6% 0.004 95);
      --surface:      oklch(100% 0 0);
      --surface-2:    oklch(96.4% 0.005 95);
      --surface-3:    oklch(93.5% 0.006 95);

      /* Ink — deep violet-tinted neutrals */
      --ink:          oklch(24% 0.022 290);
      --ink-2:        oklch(42% 0.020 290);
      --muted:        oklch(58% 0.014 290);
      --faint:        oklch(70% 0.010 290);

      /* Hairlines */
      --line:         oklch(90% 0.006 290);
      --line-strong:  oklch(82% 0.012 290);

      /* Single confident accent — matte violet, used sparingly */
      --accent:       oklch(50% 0.17 295);
      --accent-ink:   oklch(43% 0.18 295);   /* accent text on paper (contrast-safe) */
      --accent-wash:  oklch(95.5% 0.028 295);
      --accent-line:  oklch(88% 0.05 295);

      /* Semantic (used sparingly) */
      --ok:   oklch(52% 0.13 155);
      --warn: oklch(66% 0.15 70);
      --bad:  oklch(55% 0.19 25);

      /* Dark code surface — focal anchor on the light page */
      --code-bg:   oklch(23% 0.018 290);
      --code-bg-2: oklch(27% 0.018 290);
      --code-fg:   oklch(92% 0.008 290);
      --code-dim:  oklch(64% 0.012 290);
      --code-kw:   oklch(78% 0.12 300);
      --code-fn:   oklch(80% 0.13 165);
      --code-str:  oklch(82% 0.13 95);
      --code-num:  oklch(80% 0.12 50);
      --code-op:   oklch(74% 0.10 250);
      --code-com:  oklch(58% 0.01 290);

      --radius:    14px;
      --radius-lg: 22px;
      --max-width: 1140px;

      --font-display: 'Fraunces', Georgia, 'Times New Roman', serif;
      --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
      --font-mono: 'JetBrains Mono', ui-monospace, 'SFMono-Regular', Menlo, monospace;

      --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
      --ease-io:  cubic-bezier(0.65, 0, 0.35, 1);
      --t-fast: 140ms;
      --t-mid:  280ms;
      --t-slow: 520ms;
    }

    html { scroll-behavior: smooth; }
    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
    }

    body {
      font-family: var(--font-sans);
      background: var(--paper);
      color: var(--ink-2);
      line-height: 1.7;
      font-size: 1.02rem;
      -webkit-font-smoothing: antialiased;
      text-rendering: optimizeLegibility;
      overflow-x: hidden;
    }

    h1, h2, h3, h4 { font-family: var(--font-display); color: var(--ink); font-weight: 600; line-height: 1.08; letter-spacing: -0.018em; }
    h1 { font-size: clamp(2.6rem, 6vw, 4.6rem); }
    h2 { font-size: clamp(1.9rem, 4vw, 3rem); }
    h3 { font-size: 1.3rem; letter-spacing: -0.01em; }
    p { color: var(--ink-2); }
    code, pre { font-family: var(--font-mono); font-size: .9em; }
    a { color: var(--accent-ink); text-decoration: none; transition: color var(--t-fast) var(--ease-out); }
    a:hover { color: var(--accent); }
    ::selection { background: var(--accent); color: #fff; }

    .container { max-width: var(--max-width); margin: 0 auto; padding: 0 clamp(20px, 5vw, 32px); }

    /* ---- Language switch (preserve i18n mechanics) ---- */
    [data-lang] { display: none !important; }
    html.zh [data-lang="zh"] { display: inline !important; }
    html.en [data-lang="en"] { display: inline !important; }
    html.en [data-lang-block="zh"] { display: none !important; }
    html.zh [data-lang-block="en"] { display: none !important; }
    html.zh [data-lang-block="zh"] { display: block !important; }
    html.en [data-lang-block="en"] { display: block !important; }

    .lang-toggle {
      display: flex; align-items: center; gap: 2px;
      background: var(--surface); border: 1px solid var(--line);
      border-radius: 9px; padding: 3px; cursor: pointer;
      user-select: none; font-size: .8rem; font-weight: 600;
    }
    .lang-toggle span { padding: 4px 11px; border-radius: 6px; color: var(--muted); transition: all var(--t-fast) var(--ease-out); }
    .lang-toggle span.active { background: var(--accent); color: #fff; }
    .lang-toggle:hover { border-color: var(--line-strong); }

    /* ---- Navigation ---- */
    nav {
      position: fixed; top: 0; left: 0; right: 0; z-index: 100;
      background: rgba(255,255,255,.82);
      backdrop-filter: blur(16px) saturate(1.4);
      -webkit-backdrop-filter: blur(16px) saturate(1.4);
      border-bottom: 1px solid transparent;
      transition: border-color var(--t-mid) var(--ease-out), box-shadow var(--t-mid) var(--ease-out);
    }
    nav.scrolled { border-bottom-color: var(--line); box-shadow: 0 1px 0 var(--line), 0 12px 30px -24px rgba(40,30,80,.25); }
    nav .container { display: flex; align-items: center; justify-content: space-between; height: 66px; }
    .logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.18rem; color: var(--ink); font-family: var(--font-sans); letter-spacing: -0.01em; }
    .logo-icon {
      width: 32px; height: 32px;
      background: var(--accent); border-radius: 9px;
      display: flex; align-items: center; justify-content: center;
      font-family: var(--font-sans); font-size: 16px; font-weight: 800; color: #fff;
      transition: transform var(--t-mid) var(--ease-out);
    }
    .logo:hover .logo-icon { transform: scale(1.06) rotate(-4deg); }
    .nav-links { display: flex; align-items: center; gap: 26px; }
    .nav-links a { color: var(--ink-2); font-size: .9rem; font-weight: 500; position: relative; padding: 4px 0; transition: color var(--t-fast) var(--ease-out); }
    .nav-links a:hover { color: var(--ink); }
    .nav-links a:not(.nav-cta)::after {
      content: ''; position: absolute; bottom: -2px; left: 0; right: 0;
      height: 2px; background: var(--accent); border-radius: 2px;
      transform: scaleX(0); transform-origin: left; transition: transform var(--t-mid) var(--ease-out);
    }
    .nav-links a:not(.nav-cta):hover::after { transform: scaleX(1); }
    .nav-cta { padding: 8px 20px; background: var(--accent); color: #fff !important; border-radius: 9px; font-weight: 600; transition: background var(--t-fast) var(--ease-out), transform var(--t-fast) var(--ease-out); }
    .nav-cta::after { display: none !important; }
    .nav-cta:hover { background: var(--accent-ink); transform: translateY(-1px); }
    .mobile-menu-btn { display: none; background: none; border: none; color: var(--ink); font-size: 1.5rem; cursor: pointer; padding: 4px; }

    /* ---- Hero ---- */
    .hero { padding: clamp(120px, 16vw, 180px) 0 clamp(56px, 8vw, 90px); position: relative; }
    .hero .container { position: relative; z-index: 1; text-align: left; }
    .hero-badge {
      display: inline-flex; align-items: center; gap: 8px; padding: 6px 15px;
      background: var(--accent-wash); border: 1px solid var(--accent-line);
      border-radius: 100px; font-size: .82rem; color: var(--accent-ink); font-weight: 600; margin-bottom: 26px;
    }
    .hero h1 { margin-bottom: 22px; max-width: 14ch; color: var(--ink); }
    .hero p { font-size: clamp(1.05rem, 1.6vw, 1.25rem); max-width: 60ch; color: var(--ink-2); margin-bottom: 34px; }
    .hero-actions { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }

    .btn {
      display: inline-flex; align-items: center; gap: 8px; padding: 13px 28px;
      border-radius: 11px; font-family: var(--font-sans); font-weight: 600; font-size: .98rem;
      transition: background var(--t-fast) var(--ease-out), color var(--t-fast) var(--ease-out), border-color var(--t-fast) var(--ease-out), transform var(--t-fast) var(--ease-out);
      border: 1px solid transparent; cursor: pointer; white-space: nowrap;
    }
    .btn-primary { background: var(--accent); color: #fff; }
    .btn-primary:hover { background: var(--accent-ink); transform: translateY(-2px); }
    .btn-secondary { background: var(--surface); color: var(--ink); border-color: var(--line-strong); }
    .btn-secondary:hover { border-color: var(--accent); color: var(--accent-ink); transform: translateY(-2px); }

    .hero-code {
      margin-top: clamp(40px, 6vw, 64px); background: var(--code-bg);
      border: 1px solid var(--code-bg-2); border-radius: var(--radius-lg);
      overflow: hidden; text-align: left; box-shadow: 0 30px 70px -30px rgba(30,20,60,.45);
      transition: box-shadow var(--t-mid) var(--ease-out);
    }
    .hero-code:hover { box-shadow: 0 40px 90px -30px rgba(30,20,60,.5); }
    .hero-code-header { display: flex; align-items: center; gap: 8px; padding: 13px 20px; background: var(--code-bg-2); border-bottom: 1px solid rgba(255,255,255,.07); }
    .hero-code-dot { width: 11px; height: 11px; border-radius: 50%; }
    .hero-code-dot:nth-child(1) { background: #ff5f57; }
    .hero-code-dot:nth-child(2) { background: #febc2e; }
    .hero-code-dot:nth-child(3) { background: #28c840; }
    .hero-code-title { margin-left: 12px; font-family: var(--font-mono); font-size: .76rem; color: var(--code-dim); }
    .hero-code pre { padding: 22px 24px; overflow-x: auto; font-size: .84rem; line-height: 1.75; color: var(--code-fg); }
    .hero-code pre code { color: var(--code-fg); }
    .hl-kw { color: var(--code-kw); } .hl-fn { color: var(--code-fn); }
    .hl-str { color: var(--code-str); } .hl-num { color: var(--code-num); }
    .hl-com { color: var(--code-com); font-style: italic; } .hl-op { color: var(--code-op); }

    /* ---- Section scaffolding ---- */
    section { padding: clamp(72px, 10vw, 124px) 0; }
    .section-label {
      display: inline-flex; align-items: center; gap: 10px;
      font-family: var(--font-sans); font-size: .78rem; font-weight: 700;
      letter-spacing: .14em; text-transform: uppercase; color: var(--accent-ink);
      margin-bottom: 14px;
    }
    .section-label::before { content: ''; width: 26px; height: 2px; background: var(--accent); border-radius: 2px; }
    .section-title { margin-bottom: 16px; max-width: 18ch; }
    .section-desc { font-size: 1.1rem; max-width: 58ch; margin-bottom: clamp(40px, 6vw, 64px); color: var(--ink-2); }

    /* ---- Stats band ---- */
    .stats { background: var(--surface-2); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
    .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: clamp(28px, 5vw, 56px); }
    .stat-number { font-family: var(--font-display); font-size: clamp(2.2rem, 4vw, 3rem); font-weight: 600; color: var(--ink); letter-spacing: -0.02em; line-height: 1; }
    .stat-label { font-size: .92rem; color: var(--muted); margin-top: 10px; }

    /* ---- Features — editorial list (replaces card grid) ---- */
    .features { background: var(--paper); }
    .feature-list { display: grid; grid-template-columns: 1fr 1fr; column-gap: clamp(40px, 6vw, 72px); margin-top: clamp(40px, 5vw, 56px); }
    .feature-item {
      display: grid; grid-template-columns: 48px 1fr; gap: 18px;
      padding: clamp(28px, 3.5vw, 38px) 0; border-top: 1px solid var(--line);
    }
    .feature-index { font-family: var(--font-display); font-size: 1.5rem; font-weight: 600; color: var(--accent); line-height: 1; padding-top: 2px; }
    .feature-item h3 { margin-bottom: 10px; color: var(--ink); }
    .feature-item p { font-size: .96rem; color: var(--ink-2); }
    .feature-tag { display: inline-block; padding: 3px 11px; border-radius: 100px; font-family: var(--font-sans); font-size: .7rem; font-weight: 700; letter-spacing: .03em; margin-top: 14px; }
    .feature-tag.core { background: var(--accent-wash); color: var(--accent-ink); }
    .feature-tag.pro { background: var(--surface-3); color: var(--ink-2); border: 1px solid var(--line); }
    .feature-tag.new { background: var(--surface-3); color: var(--ink-2); border: 1px solid var(--line); }

    /* ---- Architecture ---- */
    .arch { background: var(--surface); }
    .arch .section-desc { margin-left: 0; }
    .arch-diagram { display: flex; flex-direction: column; align-items: stretch; gap: 0; margin-top: clamp(36px, 5vw, 52px); max-width: 760px; }
    .arch-layer { background: var(--surface); border: 1px solid var(--line); border-left: 3px solid var(--accent); border-radius: var(--radius); padding: 22px 28px; transition: border-color var(--t-mid) var(--ease-out), transform var(--t-mid) var(--ease-out); }
    .arch-layer:hover { border-left-color: var(--accent-ink); transform: translateX(4px); }
    .arch-layer h4 { font-family: var(--font-sans); margin-bottom: 6px; font-size: 1.02rem; color: var(--ink); font-weight: 700; letter-spacing: -0.01em; }
    .arch-layer p { font-size: .92rem; color: var(--ink-2); }
    .arch-arrow { color: var(--faint); font-size: 1.3rem; padding: 6px 0 6px 30px; line-height: 1; }
    .arch-layer.l1 { border-left-color: oklch(55% 0.15 250); }
    .arch-layer.l2 { border-left-color: var(--accent); }
    .arch-layer.l3 { border-left-color: oklch(55% 0.13 165); }
    .arch-layer.l4 { border-left-color: oklch(60% 0.16 30); }

    /* ---- Code examples ---- */
    .code-examples { background: var(--surface-2); }
    .code-tabs { display: flex; gap: 6px; flex-wrap: wrap; }
    .code-tab {
      padding: 10px 18px; background: transparent; border: 1px solid var(--line); border-bottom: none;
      border-radius: 10px 10px 0 0; color: var(--muted); font-family: var(--font-sans);
      font-size: .85rem; font-weight: 600; cursor: pointer; transition: all var(--t-fast) var(--ease-out);
    }
    .code-tab:hover { color: var(--ink); }
    .code-tab.active { background: var(--code-bg); color: var(--code-fg); border-color: var(--code-bg); }
    .code-panel { background: var(--code-bg); border: 1px solid var(--code-bg); border-radius: 0 var(--radius) var(--radius) var(--radius); padding: 24px; overflow-x: auto; display: none; }
    .code-panel.active { display: block; }
    .code-panel pre { font-size: .84rem; line-height: 1.75; color: var(--code-fg); }
    .code-panel .comment { color: var(--code-com); font-style: italic; }
    .code-panel .keyword { color: var(--code-kw); }
    .code-panel .string { color: var(--code-str); }
    .code-panel .function { color: var(--code-fn); }
    .code-panel .number { color: var(--code-num); }
    .code-panel .operator { color: var(--code-op); }
    .code-panel .type { color: var(--code-op); font-weight: 500; }

    /* ---- Use cases ---- */
    .cases-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 22px; }
    .case-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 32px; transition: border-color var(--t-mid) var(--ease-out), transform var(--t-mid) var(--ease-out); }
    .case-card:hover { border-color: var(--accent-line); transform: translateY(-3px); }
    .case-card h3 { margin-bottom: 10px; display: flex; align-items: center; gap: 10px; font-size: 1.15rem; }
    .case-card h3 .emoji { font-size: 1.3rem; }
    .case-card p { font-size: .95rem; color: var(--ink-2); }
    .case-stat { margin-top: 18px; padding: 11px 15px; background: var(--accent-wash); border-radius: 10px; font-size: .84rem; font-weight: 500; color: var(--accent-ink); }

    /* ---- Pricing ---- */
    .pricing-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 22px; align-items: start; }
    .pricing-card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius-lg); padding: 36px 32px; position: relative; transition: border-color var(--t-mid) var(--ease-out), transform var(--t-mid) var(--ease-out); }
    .pricing-card:hover { transform: translateY(-3px); border-color: var(--line-strong); }
    .pricing-card.featured { border-color: var(--accent); border-width: 1.5px; box-shadow: 0 30px 60px -36px var(--accent-wash); }
    .pricing-card.featured::before {
      content: 'Most Popular'; position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
      padding: 5px 16px; background: var(--accent); border-radius: 100px; font-family: var(--font-sans);
      font-size: .72rem; font-weight: 700; color: #fff; letter-spacing: .02em;
    }
    .pricing-name { font-family: var(--font-display); font-size: 1.35rem; font-weight: 600; color: var(--ink); margin-bottom: 4px; }
    .pricing-desc { font-size: .9rem; color: var(--muted); margin-bottom: 20px; min-height: 2.6em; }
    .pricing-price { font-family: var(--font-display); font-size: 2.6rem; font-weight: 600; color: var(--ink); letter-spacing: -0.02em; margin-bottom: 4px; }
    .pricing-price span { font-family: var(--font-sans); font-size: 1rem; font-weight: 500; color: var(--muted); }
    .pricing-period { font-size: .85rem; color: var(--muted); margin-bottom: 24px; }
    .pricing-features { list-style: none; margin-bottom: 28px; }
    .pricing-features li { padding: 9px 0; font-size: .92rem; color: var(--ink-2); display: flex; align-items: flex-start; gap: 10px; }
    .pricing-features li::before { content: ''; flex: none; width: 18px; height: 18px; margin-top: 3px; border-radius: 50%; background: var(--accent-wash) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23433aa0' stroke-width='3.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E") center / 11px no-repeat; }
    .pricing-card .btn { width: 100%; justify-content: center; }

    /* ---- Testimonials ---- */
    .testimonials { background: var(--surface); }
    .testimonials-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 22px; margin-bottom: 48px; }
    .testimonial-card { background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 30px; transition: border-color var(--t-mid) var(--ease-out), transform var(--t-mid) var(--ease-out); }
    .testimonial-card:hover { border-color: var(--accent-line); transform: translateY(-3px); }
    .testimonial-stars { color: var(--accent); font-size: .95rem; letter-spacing: 3px; margin-bottom: 14px; }
    .testimonial-quote { font-size: .96rem; line-height: 1.75; color: var(--ink-2); font-style: italic; margin-bottom: 22px; }
    .testimonial-author { display: flex; align-items: center; gap: 12px; }
    .testimonial-avatar { font-size: 1.5rem; }
    .testimonial-name { font-family: var(--font-sans); font-weight: 700; font-size: .92rem; color: var(--ink); }
    .testimonial-role { font-size: .8rem; color: var(--muted); }
    .testimonials-stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: clamp(24px, 4vw, 44px); text-align: center; margin-top: 8px; padding-top: 48px; border-top: 1px solid var(--line); }
    .ts-stat { display: flex; flex-direction: column; gap: 4px; }
    .ts-number { font-family: var(--font-display); font-size: clamp(1.8rem, 3vw, 2.4rem); font-weight: 600; color: var(--ink); letter-spacing: -0.02em; line-height: 1; }
    .ts-label { font-size: .82rem; color: var(--muted); }

    /* ---- CTA band (focal moment) ---- */
    .cta { text-align: center; }
    .cta .container {
      background: var(--accent); color: #fff; border-radius: var(--radius-lg);
      padding: clamp(48px, 8vw, 84px) clamp(24px, 5vw, 48px);
    }
    .cta h2 { color: #fff; margin-bottom: 16px; }
    .cta p { color: rgba(255,255,255,.88); max-width: 52ch; margin: 0 auto 34px; font-size: 1.08rem; }
    .cta .hero-actions { justify-content: center; }
    .cta .btn-primary { background: #fff; color: var(--accent); }
    .cta .btn-primary:hover { background: var(--surface-2); }
    .cta .btn-secondary { background: transparent; color: #fff; border-color: rgba(255,255,255,.45); }
    .cta .btn-secondary:hover { background: rgba(255,255,255,.16); border-color: #fff; }

    /* ---- Footer ---- */
    footer { border-top: 1px solid var(--line); padding: 44px 0; background: var(--paper); }
    footer .container { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; }
    footer p { font-size: .85rem; color: var(--muted); }
    .footer-links { display: flex; gap: 22px; flex-wrap: wrap; }
    .footer-links a { font-size: .85rem; color: var(--muted); }
    .footer-links a:hover { color: var(--ink); }

    /* ---- Motion utilities ---- */
    .fade-in { opacity: 0; transform: translateY(18px); transition: opacity var(--t-slow) var(--ease-out), transform var(--t-slow) var(--ease-out); }
    .fade-in.visible { opacity: 1; transform: translateY(0); }

    /* Scroll progress bar */
    .scroll-progress { position: fixed; top: 0; left: 0; height: 3px; z-index: 200; background: var(--accent); transition: width .1s linear; }

    /* Back to top */
    .back-to-top {
      position: fixed; bottom: 30px; right: 30px; z-index: 99;
      width: 44px; height: 44px; border-radius: 50%;
      background: var(--surface); border: 1px solid var(--line-strong);
      color: var(--ink); font-size: 1.2rem; cursor: pointer;
      display: flex; align-items: center; justify-content: center;
      opacity: 0; transform: translateY(16px);
      transition: all var(--t-mid) var(--ease-out); pointer-events: none;
    }
    .back-to-top.visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
    .back-to-top:hover { background: var(--accent); border-color: var(--accent); color: #fff; transform: translateY(-3px); }

    /* Copy button (sits on dark code) */
    .copy-btn {
      position: absolute; top: 10px; right: 10px; z-index: 2;
      background: rgba(255,255,255,.08); border: 1px solid rgba(255,255,255,.14);
      border-radius: 7px; padding: 4px 9px; cursor: pointer; color: var(--code-fg);
      font-size: .8rem; line-height: 1; opacity: 0; transition: opacity var(--t-fast) var(--ease-out), background var(--t-fast) var(--ease-out);
    }
    .code-panel:hover .copy-btn, .hero-code:hover .copy-btn { opacity: 1; }
    .copy-btn:hover { background: var(--accent); border-color: var(--accent); color: #fff; }

    /* ============================================================
       Subpage: hero + legal document
       ============================================================ */
    .page-hero {
      padding: clamp(120px, 15vw, 160px) 0 clamp(36px, 5vw, 52px);
      text-align: center;
      border-bottom: 1px solid var(--line);
      background: var(--surface);
    }
    .page-hero .page-title { font-size: clamp(2.2rem, 5vw, 3.2rem); font-weight: 600; color: var(--ink); letter-spacing: -.02em; }
    .page-hero .page-sub { margin-top: 14px; color: var(--muted); font-size: 1rem; }
    .breadcrumb { margin-top: 20px; font-size: .85rem; color: var(--muted); }
    .breadcrumb a { color: var(--accent-ink); }

    .doc { max-width: 780px; margin: 0 auto; padding: clamp(40px, 6vw, 64px) clamp(20px, 4vw, 24px) clamp(60px, 8vw, 90px); }
    .doc h2 {
      font-family: var(--font-display); font-size: clamp(1.4rem, 3vw, 1.7rem); font-weight: 600;
      color: var(--ink); margin: 44px 0 14px; padding-bottom: 10px; border-bottom: 1px solid var(--line);
    }
    .doc h2:first-child { margin-top: 0; }
    .doc h3 { font-family: var(--font-sans); font-size: 1.08rem; font-weight: 700; color: var(--ink); margin: 26px 0 8px; }
    .doc p { color: var(--ink-2); line-height: 1.85; margin: 12px 0; font-size: .98rem; }
    .doc ul { margin: 12px 0 12px 22px; color: var(--ink-2); line-height: 1.8; }
    .doc li { margin: 7px 0; }
    .doc strong { color: var(--ink); font-weight: 700; }
    .doc a.inline { color: var(--accent-ink); text-decoration: underline; text-underline-offset: 2px; }
    .doc .updated { color: var(--muted); font-size: .85rem; margin-bottom: 8px; }
    .doc .toc { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 18px 24px; margin: 8px 0 36px; }
    .doc .toc li { list-style: none; margin: 5px 0; }
    .doc .toc a { color: var(--accent-ink); }
    .doc .contact-card { background: var(--accent-wash); border: 1px solid var(--accent-line); border-radius: 16px; padding: 28px; margin: 32px 0; }
    .doc .contact-card a { color: var(--accent-ink); font-weight: 700; }
    .faq-item { border: 1px solid var(--line); border-radius: 14px; padding: 18px 22px; margin: 14px 0; background: var(--surface); }
    .faq-item h3 { margin: 0 0 8px; color: var(--ink); font-size: 1rem; }
    .faq-item p { margin: 0; }
    .page-actions { text-align: center; margin-top: 40px; }
    .page-actions .btn { display: inline-block; margin: 6px; }

    /* ============================================================
       Responsive
       ============================================================ */
    @media (max-width: 860px) {
      .feature-list { grid-template-columns: 1fr; }
      .stats-grid { grid-template-columns: repeat(2, 1fr); }
      .testimonials-stats { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 768px) {
      .nav-links { display: none; }
      .mobile-menu-btn { display: block; }
      .nav-links.open {
        display: flex; flex-direction: column; position: absolute; top: 66px; left: 0; right: 0;
        background: var(--surface); border-bottom: 1px solid var(--line); padding: 18px 24px; gap: 14px; align-items: flex-start;
        box-shadow: 0 20px 40px -24px rgba(30,20,60,.3);
      }
      .hero { padding-top: 120px; }
      .hero p { font-size: 1.02rem; }
      .hero-actions { flex-direction: column; align-items: stretch; }
      .hero-actions .btn { width: 100%; justify-content: center; }
      .cases-grid, .pricing-grid, .testimonials-grid { grid-template-columns: 1fr; }
      .code-tabs { overflow-x: auto; flex-wrap: nowrap; }
      .code-tab { white-space: nowrap; }
      footer .container { flex-direction: column; text-align: center; }
      .page-hero .page-title { font-size: 2rem; }
      .doc { padding: 32px 18px 56px; }
      .doc h2 { font-size: 1.3rem; }
    }
    @media (max-width: 480px) {
      .stats-grid, .testimonials-stats { grid-template-columns: 1fr; }
    }