/* ============================================================
   通俗版 · 浅色（已对齐主页 Hy-Memory 设计语言）
   背景 #fafaf9 暖白 · 品牌橙红 #E85D4C · zinc/stone 中性 · 纸张噪点
   仅换皮肤，HTML 结构 / class 选择器与深色版保持一致
   ============================================================ */
:root {
    --bg: #fafaf9;            /* stone-50 暖白，对齐主页 */
    --bg-soft: #f5f5f4;       /* stone-100 */
    --text: #18181b;          /* zinc-900 */
    --muted: #52525b;         /* zinc-600 */
    --muted-2: #a1a1aa;       /* zinc-400 */
    --surface: #ffffff;
    --surface-2: #f5f5f4;
    --border: #e7e5e4;        /* stone-200 */
    --border-strong: #d4d4d8; /* zinc-300 */
    --brand: #E85D4C;         /* 主页 brand */
    --brand-hover: #D14E3E;   /* 主页 brand.hover */
    --brand-2: #D14E3E;
    --accent: #E85D4C;
    --brand-tint: rgba(232, 93, 76, .06);
    --brand-tint-2: rgba(232, 93, 76, .12);
    --brand-edge: rgba(232, 93, 76, .22);
    --good: #059669;
    --warn: #b45309;
    --danger: #e11d48;
    --grad: #E85D4C;          /* 主页几乎不用渐变文字，统一 brand 纯色 */
    --grad-soft: rgba(232, 93, 76, .05);
    --radius: 16px;
    --shadow: 0 8px 30px rgba(24, 24, 27, .06);
    --card-shadow: 0 1px 2px rgba(24, 24, 27, .04), 0 10px 30px -18px rgba(24, 24, 27, .18);
    --maxw: 1180px;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
    --mono: ui-monospace, "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
  }

  * { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
  }

  /* ---------- 背景装饰：纸张噪点 + 暖色光晕（对齐主页） ---------- */
  .bg-orbs, .bg-deco { position: fixed; inset: 0; z-index: 0; pointer-events: none; overflow: hidden; }
  .bg-orbs .orb, .bg-deco .glow { position: absolute; border-radius: 50%; filter: blur(110px); }
  .bg-orbs .orb.a, .bg-deco .g1 { width: 520px; height: 520px; background: rgba(232, 93, 76, .10); top: -180px; left: -120px; }
  .bg-orbs .orb.b, .bg-deco .g2 { width: 460px; height: 460px; background: rgba(231, 229, 228, .55); top: 120px; right: -160px; }
  .bg-orbs .orb.c { width: 380px; height: 380px; background: rgba(232, 93, 76, .055); bottom: -120px; left: 40%; }
  .grid-overlay {
    position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: .02;
    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");
    background-repeat: repeat;
  }

  .container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; position: relative; z-index: 1; }

  /* ---------- logo / 按钮 ---------- */
  .logo { display: flex; align-items: center; gap: 11px; font-weight: 700; font-size: 18px; letter-spacing: -.01em; color: var(--text); text-decoration: none; }
  .brand-logo { height: 30px; width: auto; display: block; }
  @media (max-width: 940px) { .brand-logo { height: 26px; } }
  .logo .mark { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center;
    background: var(--text); box-shadow: 0 8px 18px -10px rgba(24,24,27,.5); flex: none; }
  .logo .mark svg { width: 20px; height: 20px; }
  .logo .mark svg path { fill: #fff !important; }
  .logo small { display: block; font-size: 10.5px; font-weight: 600; color: var(--muted); letter-spacing: 2px; }

  .btn { display: inline-flex; align-items: center; gap: 8px; cursor: pointer; font-weight: 600; font-size: 14px;
    text-decoration: none; border: none; padding: 11px 20px; border-radius: 12px;
    transition: transform .15s, box-shadow .2s, background .2s, border-color .2s; font-family: inherit; }
  .btn-primary { background: var(--text); color: #fff; box-shadow: inset 0 1px 1px rgba(255,255,255,.15), 0 10px 15px -3px rgba(0,0,0,.08); }
  .btn-primary:hover { background: #27272a; transform: translateY(-1px); }
  .btn-ghost { background: #fff; color: var(--text); border: 1px solid var(--border-strong); }
  .btn-ghost:hover { background: var(--bg-soft); border-color: var(--muted-2); transform: translateY(-1px); }
  .btn.lg { padding: 14px 26px; font-size: 15px; border-radius: 13px; }

  /* ---------- hero ---------- */
  .hero { padding: 64px 0 56px; background: radial-gradient(ellipse 70% 60% at 72% 0%, rgba(232,93,76,.06) 0%, transparent 62%); }
  .hero-grid { display: grid; grid-template-columns: 1.08fr .92fr; gap: 54px; align-items: center; }
  .eyebrow { display: inline-flex; align-items: center; gap: 9px; font-size: 11px; font-weight: 700; color: var(--brand);
    text-transform: uppercase; letter-spacing: .14em;
    background: var(--brand-tint); border: 1px solid var(--brand-edge); padding: 7px 14px; border-radius: 999px; margin-bottom: 24px; }
  .eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--brand); box-shadow: 0 0 10px rgba(232,93,76,.7); }
  h1.hero-title { font-size: 56px; line-height: 1.0; font-weight: 650; letter-spacing: -.05em; color: #09090b; }
  h1.hero-title .g { color: var(--brand); }
  .hero-sub { margin-top: 24px; font-size: 18px; line-height: 1.7; color: var(--muted); max-width: 540px; font-weight: 450; }
  .hero-sub b { color: var(--text); font-weight: 650; }
  .hero-cta { display: flex; gap: 14px; margin-top: 32px; flex-wrap: wrap; }
  .hero-note { margin-top: 18px; font-size: 13px; color: var(--muted-2); display: flex; align-items: center; gap: 8px; }

  /* ---------- 对话演示卡 ---------- */
  .demo { background: rgba(255,255,255,.8); border: 1px solid rgba(244,244,245,.9); border-radius: 24px; padding: 18px;
    box-shadow: var(--shadow); position: relative; backdrop-filter: blur(12px); }
  .demo-head { display: flex; align-items: center; gap: 8px; padding: 4px 6px 14px; border-bottom: 1px solid var(--border); }
  .demo-head .dot3 { width: 11px; height: 11px; border-radius: 50%; }
  .demo-head .r { background: #ff5f57; } .demo-head .y { background: #febc2e; } .demo-head .g { background: #28c840; }
  .demo-head .t { margin-left: 10px; font-size: 12.5px; color: var(--muted); font-family: var(--mono); }
  .chat { padding: 16px 10px 6px 6px; display: flex; flex-direction: column; gap: 14px; max-height: 360px; overflow-y: auto; }
  .chat::-webkit-scrollbar { width: 6px; }
  .chat::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 3px; }
  .chat .day { align-self: center; font-size: 11px; color: var(--muted-2); letter-spacing: 1px; margin: 2px 0; }
  .msg { max-width: 85%; padding: 11px 15px; border-radius: 14px; font-size: 14.5px; position: relative; }
  .msg.user { align-self: flex-end; background: var(--bg-soft); border: 1px solid var(--border); border-bottom-right-radius: 4px; }
  .msg.ai { align-self: flex-start; background: var(--brand-tint); border: 1px solid var(--brand-edge); border-bottom-left-radius: 4px; }
  .msg b { color: var(--brand); }
  .msg .who { font-size: 11px; color: var(--muted-2); margin-bottom: 3px; font-weight: 600; }
  .recall-chip { align-self: flex-start; display: inline-flex; align-items: center; gap: 7px; font-size: 12px; color: var(--brand);
    background: var(--brand-tint); border: 1px dashed var(--brand-edge); padding: 6px 11px; border-radius: 999px; font-weight: 600; }
  .recall-chip svg { width: 13px; height: 13px; }
  .recall-chip.evo { color: var(--warn); background: #fff7ed; border-color: #fdba74; }

  .stats { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; margin-top: 64px; }
  .stat { text-align: center; padding: 22px 12px; background: #fff; border: 1px solid var(--border); border-radius: 16px; box-shadow: var(--card-shadow); }
  .stat .n { font-size: 30px; font-weight: 700; color: var(--brand); letter-spacing: -.03em; }
  .stat .l { font-size: 12.5px; color: var(--muted); margin-top: 4px; }

  /* ---------- section ---------- */
  section { padding: 80px 0; position: relative; z-index: 1; }
  .sec-head { max-width: 720px; margin: 0 auto 50px; text-align: center; }
  .sec-eyebrow { font-size: 12px; font-weight: 700; letter-spacing: .24em; text-transform: uppercase; color: var(--brand); }
  .sec-title { font-size: 38px; font-weight: 650; margin-top: 14px; letter-spacing: -.04em; line-height: 1.12; color: #09090b; }
  .sec-sub { font-size: 16.5px; color: var(--muted); margin-top: 16px; line-height: 1.7; }

  /* ---------- pain ---------- */
  .pain-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
  .pain { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 22px; box-shadow: var(--card-shadow);
    transition: transform .2s, box-shadow .2s; }
  .pain:hover { transform: translateY(-4px); box-shadow: 0 18px 40px -20px rgba(24,24,27,.22); }
  .pain .ic { font-size: 26px; margin-bottom: 14px; display: block; }
  .pain h3 { font-size: 16.5px; font-weight: 650; margin-bottom: 9px; letter-spacing: -.01em; }
  .pain p { font-size: 14px; color: var(--muted); }
  .pain .quote { margin-top: 14px; font-size: 13px; color: #be123c; background: #fff5f5;
    border-left: 3px solid var(--brand); padding: 8px 12px; border-radius: 0 8px 8px 0; font-style: italic; }

  /* ---------- what-is ---------- */
  .whatis { background: var(--brand-tint); border: 1px solid var(--brand-edge); border-radius: 28px; padding: 56px; text-align: center; }
  .whatis .big { font-size: 30px; font-weight: 700; line-height: 1.4; max-width: 880px; margin: 0 auto; letter-spacing: -.02em; }
  .whatis .big .g { color: var(--brand); }
  .whatis .analogy { margin-top: 26px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
  .analogy .a { background: #fff; border: 1px solid var(--border); border-radius: 14px; padding: 18px 14px; box-shadow: var(--card-shadow); }
  .analogy .a .e { font-size: 24px; } .analogy .a .h { font-weight: 650; font-size: 14.5px; margin: 8px 0 4px; }
  .analogy .a .d { font-size: 12.5px; color: var(--muted); }

  /* ---------- value ---------- */
  .val-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
  .val { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 22px;
    box-shadow: var(--card-shadow); transition: transform .2s, box-shadow .2s; }
  .val:hover { transform: translateY(-5px); box-shadow: 0 18px 40px -18px rgba(24,24,27,.22); }
  .val .ic { width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center;
    background: var(--brand-tint); border: 1px solid var(--brand-edge); margin-bottom: 16px; }
  .val .ic svg { width: 23px; height: 23px; stroke: var(--brand); }
  .val h3 { font-size: 16.5px; font-weight: 650; margin-bottom: 8px; letter-spacing: -.01em; }
  .val p { font-size: 13.5px; color: var(--muted); }

  /* ---------- how ---------- */
  .how-grid { display: grid; grid-template-columns: 1.1fr 1fr; gap: 48px; align-items: center; }
  .steps { display: flex; flex-direction: column; gap: 20px; }
  .step { display: flex; gap: 18px; align-items: flex-start; }
  .step .num { flex: none; width: 44px; height: 44px; border-radius: 12px; display: grid; place-items: center;
    font-weight: 700; font-size: 18px; background: var(--text); color: #fff; box-shadow: 0 8px 18px -10px rgba(24,24,27,.5); }
  .step h3 { font-size: 18px; font-weight: 650; margin-bottom: 5px; letter-spacing: -.01em; }
  .step p { font-size: 14.5px; color: var(--muted); }
  .pyramid { display: flex; flex-direction: column; gap: 8px; align-items: center; }
  .pyramid .cap { font-size: 12.5px; color: var(--muted-2); margin-bottom: 4px; }
  .layer { width: 100%; border-radius: 12px; padding: 13px 18px; display: flex; justify-content: space-between; align-items: center;
    border: 1px solid var(--brand-edge); font-weight: 600; font-size: 14px; box-shadow: var(--card-shadow); color: var(--text); }
  .layer .tag { font-family: var(--mono); font-size: 11px; color: var(--muted-2); }
  .layer.l1 { width: 100%; background: rgba(232, 93, 76, .07); }
  .layer.l2 { width: 88%; background: rgba(232, 93, 76, .12); }
  .layer.l3 { width: 76%; background: rgba(232, 93, 76, .18); }
  .layer.l4 { width: 64%; background: rgba(232, 93, 76, .26); }
  .layer.l5 { width: 52%; background: rgba(232, 93, 76, .36); }
  .layer.l6 { width: 40%; background: rgba(232, 93, 76, .46); justify-content: center; color: #fff; }
  .layer.l6 .tag { color: rgba(255,255,255,.75); }

  /* ---------- compare ---------- */
  .compare-wrap { max-width: 920px; margin: 0 auto; border: 1px solid var(--border); border-radius: 22px; overflow: hidden; box-shadow: var(--card-shadow); background: #fff; }
  table.compare { width: 100%; border-collapse: collapse; }
  table.compare th, table.compare td { padding: 18px 22px; text-align: left; font-size: 15px; border-bottom: 1px solid var(--border); }
  table.compare thead th { background: var(--bg-soft); font-size: 14px; font-weight: 650; }
  table.compare thead th:nth-child(2) { color: var(--muted); }
  table.compare thead th:nth-child(3) { background: var(--brand-tint); color: var(--brand); }
  table.compare tbody td:first-child { color: var(--muted); font-weight: 600; width: 26%; }
  table.compare td.bad { color: #be123c; }
  table.compare td.good { background: #ecfdf5; color: #047857; font-weight: 600; }
  table.compare td.good::before { content: "✓ "; color: var(--good); font-weight: 800; }
  table.compare td.bad::before { content: "✕ "; color: var(--danger); font-weight: 800; }
  table.compare tbody tr:last-child td { border-bottom: none; }

  /* ---------- metrics ---------- */
  .metrics-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; max-width: 980px; margin: 0 auto; }
  .metric { text-align: center; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 30px 18px; box-shadow: var(--card-shadow); }
  .metric .n { font-size: 40px; font-weight: 700; color: var(--brand); letter-spacing: -.04em; }
  .metric .l { font-size: 13.5px; color: var(--muted); margin-top: 8px; }
  .note-line { text-align: center; color: var(--muted-2); font-size: 12.5px; margin-top: 22px; }
  .placeholder-badge { display: inline-block; font-size: 11px; color: var(--warn); background: #fff7ed; border: 1px dashed #fdba74; padding: 3px 9px; border-radius: 999px; margin-left: 6px; vertical-align: middle; }

  /* ---------- scenarios ---------- */
  .scn-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
  .scn { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 22px; box-shadow: var(--card-shadow); transition: transform .2s; }
  .scn:hover { transform: translateY(-5px); }
  .scn .e { font-size: 30px; } .scn h3 { font-size: 16.5px; font-weight: 650; margin: 14px 0 8px; }
  .scn p { font-size: 13.5px; color: var(--muted); }

  /* ---------- ecosystem ---------- */
  .eco { text-align: center; }
  .eco-hub { margin: 0 auto 30px; width: 100%; max-width: 760px; background: var(--brand-tint); border: 1px solid var(--brand-edge);
    border-radius: 18px; padding: 22px; font-weight: 650; font-size: 19px; letter-spacing: -.01em; }
  .eco-hub .g { color: var(--brand); }
  .eco-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
  .eco-card { background: #fff; border: 1px solid var(--border); border-radius: 14px; padding: 20px 12px; box-shadow: var(--card-shadow); transition: transform .2s; }
  .eco-card:hover { transform: translateY(-4px); }
  .eco-card .e { font-size: 22px; } .eco-card .n { font-size: 13.5px; font-weight: 650; margin-top: 9px; }
  .eco-card .d { font-size: 11.5px; color: var(--muted-2); margin-top: 3px; }

  /* ---------- testimonials ---------- */
  .tst-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
  .tst { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 22px; display: flex; flex-direction: column; gap: 16px; box-shadow: var(--card-shadow); }
  .tst .q { font-size: 14.5px; color: var(--text); line-height: 1.7; }
  .tst .who { display: flex; align-items: center; gap: 12px; margin-top: auto; }
  .tst .av { width: 42px; height: 42px; border-radius: 50%; background: var(--brand-tint); border: 1px solid var(--brand-edge); flex: none; }
  .tst .who .nm { font-weight: 650; font-size: 14px; }
  .tst .who .rl { font-size: 12px; color: var(--muted); }
  .logos { display: flex; flex-wrap: wrap; gap: 14px; justify-content: center; margin-top: 34px; }
  .logos .lg { width: 124px; height: 46px; border-radius: 10px; background: #fff; border: 1px dashed var(--border-strong); display: grid; place-items: center; color: var(--muted-2); font-size: 12px; }

  /* ---------- trust ---------- */
  .trust-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
  .trust { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 26px 22px; box-shadow: var(--card-shadow); }
  .trust .ic { font-size: 24px; margin-bottom: 12px; } .trust h3 { font-size: 16px; font-weight: 650; margin-bottom: 8px; }
  .trust p { font-size: 13.5px; color: var(--muted); }

  /* ---------- final cta ---------- */
  .cta-final { text-align: center; background: var(--text); border-radius: 28px; padding: 64px 40px; box-shadow: 0 24px 60px -28px rgba(24,24,27,.6); }
  .cta-final h2 { font-size: 40px; font-weight: 650; letter-spacing: -.04em; color: #fff; }
  .cta-final p { font-size: 17px; color: rgba(255,255,255,.78); margin: 18px auto 32px; max-width: 560px; }
  .cta-row { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
  .cta-final .btn-primary { background: var(--brand); color: #fff; box-shadow: 0 12px 26px -12px rgba(232,93,76,.6); }
  .cta-final .btn-primary:hover { background: var(--brand-hover); }
  .cta-final .btn-ghost { background: rgba(255,255,255,.1); color: #fff; border: 1px solid rgba(255,255,255,.45); }
  .cta-final .btn-ghost:hover { background: rgba(255,255,255,.2); }

  /* ---------- footer ---------- */
  footer { border-top: 1px solid var(--border); padding: 40px 0; margin-top: 30px; background: var(--bg-soft); }
  .foot-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 16px; }
  .foot-inner .muted { color: var(--muted-2); font-size: 13px; }
  .foot-tags { display: flex; gap: 10px; flex-wrap: wrap; }
  .foot-tags span { font-size: 12px; color: var(--muted); border: 1px solid var(--border); padding: 5px 11px; border-radius: 999px; background: #fff; }

  /* ---------- reveal ---------- */
  .reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
  .reveal.in { opacity: 1; transform: none; }

  /* ---------- 破误解 / 差异翻转 / 分割线 / 记忆不膨胀 ---------- */
  .myth-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
  .myth { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 28px 24px; box-shadow: var(--card-shadow); }
  .myth .bad { color: var(--danger); font-weight: 700; font-size: 17px; margin-bottom: 12px; letter-spacing: -.01em; }
  .myth .bad::before { content: "✕ "; }
  .myth .body { font-size: 14px; color: var(--muted); line-height: 1.7; }
  .myth .good { margin-top: 16px; padding-top: 16px; border-top: 1px dashed var(--border-strong); color: var(--good); font-weight: 650; font-size: 13.5px; }
  .myth .good::before { content: "✓ "; font-weight: 800; }
  .conclusion { max-width: 880px; margin: 28px auto 0; text-align: center; background: var(--brand-tint); border: 1px solid var(--brand-edge); border-radius: 16px; padding: 24px 28px; font-size: 18px; font-weight: 650; line-height: 1.65; }
  .conclusion .g { color: var(--brand); }
  .diff-flip { display: grid; grid-template-columns: 1fr auto 1fr; gap: 18px; align-items: center; max-width: 860px; margin: 0 auto; }
  .diff-flip .side { background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; text-align: center; box-shadow: var(--card-shadow); }
  .diff-flip .side.them { opacity: .72; }
  .diff-flip .side.us { background: var(--brand-tint); border-color: var(--brand-edge); }
  .diff-flip .side .lab { font-size: 12.5px; color: var(--muted-2); margin-bottom: 8px; }
  .diff-flip .side .big { font-size: 19px; font-weight: 700; letter-spacing: -.01em; }
  .diff-flip .vs { font-weight: 700; color: var(--brand); font-size: 16px; }
  .divider { max-width: 1180px; margin: 0 auto; height: 1px; background: linear-gradient(90deg, transparent, var(--border-strong) 18%, var(--border-strong) 82%, transparent); }
  .adv-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
  @media (max-width: 760px) { .diff-flip, .adv-grid, .myth-grid { grid-template-columns: 1fr; } .diff-flip .vs { transform: rotate(90deg); } }

  /* ---------- topbar + 左侧目录（玻璃化对齐主页） ---------- */
  body { padding-top: 66px; padding-left: 220px; }
  section[id] { scroll-margin-top: 84px; }
  .topbar { position: fixed; top: 0; left: 0; right: 0; height: 66px; z-index: 60; display: flex; align-items: center; background: rgba(250, 250, 249, .82); backdrop-filter: blur(14px); border-bottom: 1px solid var(--border); }
  .topbar-inner { width: 100%; padding: 0 24px; display: flex; align-items: center; }
  .topbar-actions { margin-left: auto; display: flex; gap: 10px; align-items: center; }
  .toc { position: fixed; top: 66px; left: 0; bottom: 0; width: 220px; padding: 26px 16px; display: flex; flex-direction: column; gap: 4px; border-right: 1px solid var(--border); background: rgba(250, 250, 249, .66); backdrop-filter: blur(14px); overflow-y: auto; z-index: 50; }
  .toc-title { font-size: 12px; font-weight: 700; letter-spacing: 2px; color: var(--muted-2); padding: 0 12px 6px; }
  .toc-group { font-size: 11px; font-weight: 700; letter-spacing: .1em; text-transform: uppercase; color: var(--brand); padding: 14px 12px 4px; }
  .toc a { color: var(--muted); text-decoration: none; font-size: 14.5px; font-weight: 500; padding: 9px 12px; border-radius: 9px; transition: color .2s, background .2s; }
  .toc a:hover { color: var(--text); background: var(--surface-2); }
  @media (max-width: 940px) {
    body { padding-left: 0; padding-top: 60px; }
    .topbar { height: 60px; }
    .topbar .logo small { display: none; }
    .topbar-actions .btn { white-space: nowrap; padding: 9px 14px; font-size: 13px; }
    .toc { display: none; }
  }

  /* ---------- responsive ---------- */
  @media (max-width: 940px) {
    .hero-grid, .how-grid { grid-template-columns: 1fr; gap: 40px; }
    h1.hero-title { font-size: 42px; }
    .stats { grid-template-columns: repeat(2, 1fr); }
    .pain-grid, .val-grid, .scn-grid, .trust-grid, .analogy, .metrics-grid { grid-template-columns: repeat(2, 1fr); }
    .tst-grid { grid-template-columns: 1fr; }
    .eco-grid { grid-template-columns: repeat(3, 1fr); }
    .sec-title { font-size: 30px; } .whatis { padding: 36px 24px; } .whatis .big { font-size: 23px; }
    .cta-final h2 { font-size: 30px; }
  }
  @media (max-width: 540px) {
    .pain-grid, .val-grid, .scn-grid, .trust-grid, .analogy, .eco-grid, .stats, .metrics-grid { grid-template-columns: 1fr; }
    h1.hero-title { font-size: 34px; } .whatis .big { font-size: 20px; }
  }