:root {
    --bg: #07070b;
    --surface: #0e0e15;
    --surface-2: #14141d;
    --hairline: rgba(216, 218, 224, 0.09);
    --text: #d8dae0;
    --text-2: #b0b4c0;
    --text-3: #80849a;
    --accent: #2563ff;
    --accent-2: #4f7bff;
    --accent-glow: rgba(37, 99, 255, 0.40);
    --accent-tint: rgba(37, 99, 255, 0.14);
    --long: #ff3b5c;
    --short: #00d97e;
    --diverge: #f5b83d;
    --font-display: "Space Grotesk", "Inter", -apple-system, "PingFang TC", "Microsoft JhengHei", sans-serif;
    --font-sans: "Inter", -apple-system, "PingFang TC", "Microsoft JhengHei", sans-serif;
    --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Code", Consolas, monospace;
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; }
  body {
    background: var(--bg);
    background-image: radial-gradient(ellipse 1200px 600px at 50% -200px, var(--accent-tint), transparent 60%);
    background-repeat: no-repeat;
    color: var(--text);
    font-family: var(--font-sans);
    font-size: 17px;
    line-height: 1.65;
    color-scheme: dark;
  }
  a { color: inherit; text-decoration: none; }
  .sr-only {
    position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
  }

  /* ============ topbar ============ */
  .topbar {
    position: sticky; top: 0; z-index: 50;
    display: flex; align-items: center; gap: 14px;
    padding: 16px 32px;
    background: rgba(7, 7, 11, 0.72);
    backdrop-filter: blur(20px) saturate(140%);
    -webkit-backdrop-filter: blur(20px) saturate(140%);
    border-bottom: 1px solid var(--hairline);
  }
  .logo { display: flex; align-items: center; gap: 12px; font-family: var(--font-display); font-weight: 700; font-size: 18px; }
  .logo-mark {
    width: 30px; height: 30px; border-radius: 9px; flex: none;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    display: flex; align-items: center; justify-content: center;
    color: #fff; font-size: 17px; box-shadow: 0 4px 16px var(--accent-glow);
  }
  .logo-name {
    background: linear-gradient(120deg, var(--text) 35%, var(--accent-2) 100%);
    -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  }
  .topnav { display: flex; gap: 4px; margin-left: 14px; }
  .topnav a { font-size: 16px; color: var(--text-3); padding: 8px 13px; border-radius: 8px; transition: color .15s, background .15s; }
  .topnav a:hover { color: var(--text); background: var(--surface-2); }
  .spacer { flex: 1; }
  .btn-ghost {
    font-size: 16px; color: var(--text-2); padding: 9px 18px;
    border: 1px solid var(--hairline); border-radius: 10px; transition: border-color .15s, color .15s;
  }
  .btn-ghost:hover { border-color: var(--accent-2); color: var(--text); }
  .btn-cta {
    font-size: 16px; font-weight: 600; color: #fff; padding: 9px 20px; border-radius: 10px;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    box-shadow: 0 4px 18px var(--accent-glow); transition: transform .15s, box-shadow .15s;
  }
  .btn-cta:hover { transform: translateY(-1px); box-shadow: 0 6px 24px var(--accent-glow); }

  .wrap { max-width: 1080px; margin: 0 auto; padding: 0 32px; }

  /* ============ hero ============ */
  .hero { padding: 80px 0 40px; text-align: center; }
  .hero-eyebrow {
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 16px; color: var(--accent-2); font-weight: 600;
    background: var(--accent-tint); border: 1px solid rgba(79, 123, 255, 0.25);
    padding: 7px 16px; border-radius: 999px; margin-bottom: 26px;
  }
  h1 {
    font-family: var(--font-display); font-size: clamp(34px, 5.5vw, 52px); line-height: 1.18;
    letter-spacing: -0.02em; font-weight: 700; max-width: 860px; margin: 0 auto;
  }
  h1 .hl {
    background: linear-gradient(120deg, var(--accent-2), #8fb0ff);
    -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  }
  .hero-sub { font-size: 20px; color: var(--text-2); max-width: 680px; margin: 22px auto 0; }
  .hero-ctas { display: flex; gap: 14px; justify-content: center; margin-top: 36px; flex-wrap: wrap; }
  .hero-ctas .btn-cta { font-size: 18px; padding: 14px 32px; border-radius: 12px; }
  .hero-ctas .btn-ghost { font-size: 18px; padding: 14px 28px; border-radius: 12px; }
  .hero-note { margin-top: 16px; font-size: 16px; color: var(--text-3); }
  .hero-facts { display: flex; gap: 26px; justify-content: center; margin-top: 40px; flex-wrap: wrap; }
  .fact { display: flex; align-items: center; gap: 9px; font-size: 16px; color: var(--text-2); }
  .fact .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent-2); flex: none; }

  /* ============ 看板示意（獨立 section，瀏覽器外框 + 語意 table + 比例條） ============ */
  .preview { padding: 40px 0 72px; }
  .preview-head { text-align: center; margin-bottom: 30px; }
  .browser {
    max-width: 820px; margin: 0 auto; border-radius: 18px; overflow: hidden;
    border: 1px solid var(--hairline);
    background: linear-gradient(180deg, var(--surface-2), var(--surface));
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
    position: relative;
  }
  .browser-bar {
    display: flex; align-items: center; gap: 10px;
    padding: 12px 16px; border-bottom: 1px solid var(--hairline);
    background: rgba(7, 7, 11, 0.5);
  }
  .browser-bar .win { display: flex; gap: 6px; }
  .browser-bar .win i { width: 11px; height: 11px; border-radius: 50%; background: var(--surface-2); border: 1px solid var(--hairline); }
  .browser-bar .url {
    flex: 1; text-align: center; font-family: var(--font-mono); font-size: 16px; color: var(--text-3);
    background: var(--surface-2); border-radius: 8px; padding: 4px 12px; max-width: 340px; margin: 0 auto;
  }
  .demo-badge {
    position: absolute; top: -12px; right: 18px; z-index: 2; font-size: 16px; color: var(--text-3);
    background: var(--surface-2); border: 1px solid var(--hairline);
    padding: 2px 12px; border-radius: 999px;
  }
  .board-inner { padding: 20px 24px 8px; }
  .board-meta { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
  .board-meta .t { font-family: var(--font-display); font-size: 18px; font-weight: 700; }
  /* wire 階段：更新日由 prerender 帶入實際最後交易日 */
  .board-meta .d { font-size: 16px; color: var(--text-3); }
  table.board { width: 100%; border-collapse: collapse; }
  table.board th {
    text-align: left; font-size: 16px; font-weight: 600; color: var(--text-3);
    padding: 8px 10px; border-bottom: 1px solid var(--hairline);
  }
  table.board td { padding: 13px 10px; border-bottom: 1px solid var(--hairline); font-size: 17px; vertical-align: middle; }
  table.board tr:last-child td { border-bottom: 0; }
  .code { font-family: var(--font-mono); font-size: 16px; color: var(--text-3); margin-right: 10px; }
  .sname { font-weight: 600; }
  .chip { font-size: 16px; font-weight: 600; padding: 3px 13px; border-radius: 999px; white-space: nowrap; }
  .chip.long { color: var(--long); background: rgba(255, 59, 92, 0.12); }
  .chip.short { color: var(--short); background: rgba(0, 217, 126, 0.10); }
  .chip.div { color: var(--diverge); background: rgba(245, 184, 61, 0.12); }
  .bar { height: 6px; border-radius: 3px; background: var(--surface-2); overflow: hidden; display: flex; min-width: 110px; }
  .bar i { display: block; height: 100%; }
  /* 比例條分段寬度（示意資料為靜態值，用小工具類取代 inline style width，CSP style-src 管不到 attribute） */
  .bar i.w20 { width: 20%; }
  .bar i.w22 { width: 22%; }
  .bar i.w30 { width: 30%; }
  .bar i.w34 { width: 34%; }
  .bar i.w35 { width: 35%; }
  .bar i.w45 { width: 45%; }
  .bar i.w50 { width: 50%; }
  .bar i.w66 { width: 66%; }
  .bar i.w70 { width: 70%; }
  .bar i.w78 { width: 78%; }
  /* 比例條分段色：對齊 chip 的偏多/偏空/分歧/中性色 */
  .bar i.fl { background: var(--long); }
  .bar i.fs { background: var(--short); }
  .bar i.fd { background: var(--diverge); }
  .bar i.fn { background: var(--surface-2); }
  .mention { font-size: 16px; color: var(--text-3); white-space: nowrap; }
  .board-foot {
    display: flex; align-items: center; justify-content: center; gap: 8px; flex-wrap: wrap;
    padding: 14px; border-top: 1px solid var(--hairline); margin-top: 4px;
    font-size: 16px; color: var(--text-2); background: rgba(37, 99, 255, 0.05);
  }
  .board-foot a { color: var(--accent-2); font-weight: 600; }
  .preview-trust { text-align: center; font-size: 16px; color: var(--text-3); margin-top: 14px; }

  /* ============ sections ============ */
  section { padding: 72px 0; }
  .sec-eyebrow { font-size: 16px; font-weight: 600; color: var(--accent-2); letter-spacing: 0.06em; margin-bottom: 10px; }
  h2 { font-family: var(--font-display); font-size: clamp(26px, 3.6vw, 34px); letter-spacing: -0.01em; line-height: 1.25; }
  .sec-sub { font-size: 18px; color: var(--text-2); margin-top: 12px; max-width: 640px; }
  /* 底部 CTA 區的 sec-sub 變體：置中 + 縮排上距（該區沒有其他 sec-sub 需要保留左對齊預設） */
  .final-sub { margin: 14px auto 0; text-align: center; }

  .steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; margin-top: 40px; }
  .step { background: var(--surface); border: 1px solid var(--hairline); border-radius: 16px; padding: 24px; }
  .step-num {
    font-family: var(--font-mono); font-size: 16px; color: var(--accent-2);
    background: var(--accent-tint); width: 34px; height: 34px; border-radius: 10px;
    display: flex; align-items: center; justify-content: center; margin-bottom: 16px;
  }
  .step h3 { font-size: 19px; margin-bottom: 8px; font-family: var(--font-display); }
  .step p { font-size: 16px; color: var(--text-2); }

  .feats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 40px; }
  .feat {
    display: flex; flex-direction: column;
    background: var(--surface); border: 1px solid var(--hairline); border-radius: 16px; padding: 24px;
    transition: border-color .2s;
  }
  .feat:hover { border-color: rgba(79, 123, 255, 0.35); }
  .feat .ic { font-size: 22px; margin-bottom: 12px; color: var(--accent-2); }
  .feat h3 { font-size: 19px; font-family: var(--font-display); margin-bottom: 8px; }
  .feat p { font-size: 16px; color: var(--text-2); }
  .feat-tag {
    margin-top: auto; padding-top: 14px;
    font-size: 16px; font-weight: 600;
  }
  .feat-tag.free { color: var(--short); }
  .feat-tag.gated { color: var(--diverge); }
  .feat-tag.login { color: var(--text-3); }

  /* ============ pricing ============ */
  .plans { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-top: 40px; max-width: 860px; }
  .plan { background: var(--surface); border: 1px solid var(--hairline); border-radius: 18px; padding: 30px; }
  .plan.pro { border-color: rgba(79, 123, 255, 0.45); background: linear-gradient(180deg, rgba(37, 99, 255, 0.08), var(--surface)); position: relative; }
  .plan-name { font-family: var(--font-display); font-size: 20px; font-weight: 700; }
  .plan-price { font-family: var(--font-display); font-size: 40px; font-weight: 700; margin: 14px 0 4px; }
  .plan-price small { font-size: 18px; color: var(--text-3); font-weight: 500; }
  .plan ul { list-style: none; margin-top: 18px; display: grid; gap: 11px; }
  .plan li { font-size: 16px; color: var(--text-2); display: flex; gap: 10px; }
  .plan li::before { content: "✓"; color: var(--accent-2); font-weight: 700; flex: none; }
  .plan li b { color: var(--text); font-weight: 600; }
  .plan .btn-cta, .plan .btn-ghost { display: block; text-align: center; margin-top: 24px; font-size: 17px; padding: 13px; border-radius: 12px; }
  .plan-badge {
    position: absolute; top: -13px; left: 26px; font-size: 16px; font-weight: 600; color: #fff;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    padding: 2px 14px; border-radius: 999px;
  }
  .plan-pay { font-size: 16px; color: var(--text-3); text-align: center; margin-top: 12px; }

  /* ============ FAQ ============ */
  .faq { max-width: 760px; margin-top: 36px; }
  .faq details { border-bottom: 1px solid var(--hairline); }
  .faq summary {
    cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center;
    gap: 16px; padding: 20px 4px; font-size: 18px; font-weight: 600;
  }
  .faq summary::-webkit-details-marker { display: none; }
  .faq summary::after { content: "+"; color: var(--text-3); font-size: 22px; flex: none; transition: transform .2s; }
  .faq details[open] summary::after { transform: rotate(45deg); }
  .faq .a { padding: 0 4px 20px; font-size: 17px; color: var(--text-2); max-width: 640px; }

  /* ============ 免責聲明 ============ */
  .disclaimer-sec { padding: 0 0 72px; }
  .disclaimer-card {
    max-width: 760px; padding: 18px 22px;
    border: 1px solid rgba(245, 184, 61, 0.35); border-left: 4px solid var(--diverge);
    border-radius: 12px; background: rgba(245, 184, 61, 0.05);
    font-size: 16px; color: var(--text-2);
  }
  .disclaimer-card b { color: var(--text); }

  /* ============ 底部 CTA + footer ============ */
  .final {
    text-align: center; padding: 80px 0;
    background: radial-gradient(ellipse 800px 400px at 50% 100%, var(--accent-tint), transparent 70%);
  }
  .final h2 { font-size: clamp(28px, 4vw, 38px); }
  footer { border-top: 1px solid var(--hairline); padding: 44px 0; }
  .foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 28px; }
  .foot-brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-display); font-weight: 700; font-size: 18px; margin-bottom: 12px; }
  .foot-brand .logo-mark { width: 26px; height: 26px; border-radius: 8px; font-size: 16px; }
  .foot-about { font-size: 16px; color: var(--text-3); max-width: 300px; }
  .foot-col h3 { font-size: 16px; font-weight: 600; color: var(--text-2); margin-bottom: 12px; }
  .foot-col a { display: block; font-size: 16px; color: var(--text-3); padding: 4px 0; }
  .foot-col a:hover { color: var(--text); }
  .foot-bottom {
    margin-top: 32px; padding-top: 22px; border-top: 1px solid var(--hairline);
    display: flex; gap: 18px; flex-wrap: wrap; align-items: center;
    font-size: 16px; color: var(--text-3);
  }
  .foot-bottom .copy { margin-left: auto; }

  /* ============ RWD ============ */
  @media (max-width: 900px) {
    .steps { grid-template-columns: repeat(2, 1fr); }
    .feats { grid-template-columns: repeat(2, 1fr); }
    .foot-grid { grid-template-columns: 1fr 1fr; }
  }
  @media (max-width: 640px) {
    .topnav { display: none; }
    .wrap { padding: 0 20px; }
    .topbar { padding: 14px 20px; }
    .hero { padding: 52px 0 32px; }
    .hero-sub { font-size: 18px; }
    .steps, .feats, .plans { grid-template-columns: 1fr; }
    .foot-grid { grid-template-columns: 1fr; }
    /* 手機藏「提及頻道」次要欄，保核心（個股/共識/分佈） */
    table.board th:nth-child(4), table.board td:nth-child(4) { display: none; }
    .browser-bar .url { max-width: 200px; }
    .foot-bottom .copy { margin-left: 0; }
  }