:root {
    color-scheme: light dark;
    --bg: #ffffff;
    --card: #faf5ec;
    --card-deep: #f3ecdf;
    --text: #17170f;
    --muted: #6f6a60;
    --brand: #2e7d32;
    --brand-ink: #ffffff;
    --band: #1d3a20;
    --band-text: #eef4ea;
    --line: #ece5d8;
    --nav-bg: rgba(255, 255, 255, .88);
    --shadow: 0 10px 34px rgba(72, 52, 24, .10);
  }
  @media (prefers-color-scheme: dark) {
    :root {
      --bg: #161512;
      --card: #201e19;
      --card-deep: #262420;
      --text: #f0efe9;
      --muted: #a5a094;
      --brand: #63b268;
      --brand-ink: #10240f;
      --band: #22391f;
      --band-text: #e6efe0;
      --line: #33302a;
      --nav-bg: rgba(24, 23, 20, .88);
      --shadow: 0 10px 34px rgba(0, 0, 0, .45);
    }
  }
  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Noto Sans TC", "Segoe UI", sans-serif;
    line-height: 1.75;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
  }
  a { color: inherit; }
  img { max-width: 100%; display: block; }
  .wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

  /* ── 懸浮導覽列 ─────────────────────────── */
  .nav-shell { position: sticky; top: 14px; z-index: 50; padding: 0 14px; }
  .nav {
    max-width: 1080px; margin: 0 auto;
    display: flex; align-items: center; gap: 14px;
    background: var(--nav-bg); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
    border: 1px solid var(--line); border-radius: 100px;
    padding: 10px 12px 10px 18px; box-shadow: var(--shadow);
  }
  .nav .brand { display: flex; align-items: center; gap: 9px; font-weight: 800; letter-spacing: .02em; text-decoration: none; }
  .nav .brand img { width: 26px; height: 26px; border-radius: 7px; }
  .nav .spacer { flex: 1; }
  .nav .navlink { text-decoration: none; color: var(--muted); font-size: .92rem; font-weight: 600; padding: 6px 10px; white-space: nowrap; }
  .nav .navlink:hover { color: var(--text); }
  .nav .navlink.guide .gm { display: none; }
  @media (max-width: 480px) {
    .nav .navlink.guide .gw { display: none; }
    .nav .navlink.guide .gm { display: inline; }
  }
  .btn {
    display: inline-flex; align-items: center; gap: 7px;
    background: var(--brand); color: var(--brand-ink);
    border-radius: 100px; padding: 10px 20px;
    font-weight: 700; font-size: .95rem; text-decoration: none;
    white-space: nowrap;
    transition: transform .15s ease;
  }
  .btn:hover { transform: translateY(-1px); }
  .btn .arr { font-weight: 400; }

  /* ── Hero ─────────────────────────────── */
  .hero { text-align: center; padding: 92px 0 64px; }
  .eyebrow {
    display: inline-block; font-weight: 700; color: var(--brand);
    letter-spacing: .35em; text-indent: .35em; font-size: .95rem; margin-bottom: 22px;
  }
  .hero h1 {
    font-size: clamp(2.1rem, 5.4vw, 3.9rem);
    line-height: 1.28; margin: 0 auto .9rem; max-width: 17em;
    font-weight: 900; letter-spacing: .06em;
  }
  .hero .lead { color: var(--muted); font-size: 1.08rem; max-width: 34em; margin: 0 auto 2rem; }
  .pills { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }
  .pill {
    display: inline-flex; align-items: center; gap: 8px;
    border: 1.5px solid var(--line); background: var(--card);
    border-radius: 100px; padding: 10px 22px; font-weight: 700; font-size: .95rem;
  }
  .pill .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--brand); }
  .hero .note { color: var(--muted); font-size: .88rem; margin-top: 1.1rem; }
  .hero .note a { color: var(--brand); }

  /* ── 卡片區 ───────────────────────────── */
  .cards { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; padding-bottom: 26px; }
  .card {
    background: var(--card); border-radius: 30px; overflow: hidden;
    display: flex; flex-direction: column; text-align: center;
    padding: 44px 36px 0;
  }
  .card.full { grid-column: 1 / -1; }
  .card h2 { font-size: clamp(1.35rem, 2.6vw, 1.9rem); line-height: 1.4; margin: 0 0 .5rem; font-weight: 800; letter-spacing: .03em; }
  .card p { color: var(--muted); margin: 0 auto; max-width: 34em; }
  .card .shot-well { margin-top: 30px; display: flex; justify-content: center; }
  .card .phone {
    width: min(280px, 78%); border-radius: 26px 26px 0 0;
    box-shadow: 0 -8px 30px rgba(72, 52, 24, .14);
    overflow: hidden; line-height: 0;
    cursor: zoom-in; transition: transform .25s ease;
  }
  .card .phone:hover { transform: translateY(-6px); }
  .card.full .split {
    display: grid; grid-template-columns: 1fr 1fr; align-items: center;
    gap: 30px; text-align: left; padding-bottom: 0;
  }
  .card.full .split .copy { padding: 20px 0 44px 10px; }
  .card.full .split .shot-well { margin-top: 0; align-self: end; }
  .card .tag {
    display: inline-block; font-size: .82rem; font-weight: 800; color: var(--brand);
    letter-spacing: .18em; text-indent: .18em; margin-bottom: .7rem;
  }

  /* ── 數據帶 ───────────────────────────── */
  .stats { text-align: center; padding: 84px 0 72px; }
  .stats h2 { font-size: clamp(1.5rem, 3.4vw, 2.3rem); font-weight: 900; letter-spacing: .06em; margin: 0 0 2.4rem; }
  .stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
  .stat .num { font-size: clamp(1.9rem, 4.4vw, 3rem); font-weight: 900; color: var(--brand); line-height: 1.1; }
  .stat .lbl { color: var(--muted); font-weight: 600; margin-top: .3rem; }

  /* ── 隱私帶 ───────────────────────────── */
  .band {
    background: var(--band); color: var(--band-text);
    border-radius: 30px; padding: 52px 48px; margin-bottom: 26px;
  }
  .band h2 { margin: 0 0 1rem; font-size: clamp(1.4rem, 3vw, 2rem); font-weight: 800; letter-spacing: .04em; }
  .band ul { margin: 0; padding-left: 1.2em; opacity: .92; }
  .band li { margin: .45rem 0; }

  /* ── FAQ ─────────────────────────────── */
  .faq { padding: 72px 0 40px; max-width: 760px; margin: 0 auto; }
  .faq h2 { text-align: center; font-size: clamp(1.5rem, 3.4vw, 2.3rem); font-weight: 900; letter-spacing: .1em; text-indent: .1em; margin: 0 0 2rem; }
  .faq details { border-bottom: 1px solid var(--line); }
  .faq summary {
    cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center;
    font-weight: 700; font-size: 1.05rem; padding: 20px 4px;
  }
  .faq summary::-webkit-details-marker { display: none; }
  .faq summary::after { content: "+"; font-size: 1.5rem; font-weight: 400; color: var(--muted); transition: transform .2s; }
  .faq details[open] summary::after { transform: rotate(45deg); }
  .faq .a { color: var(--muted); padding: 0 4px 22px; }
  .faq .a a { color: var(--brand); }

  /* ── 關於/支援 ───────────────────────── */
  .support { padding: 56px 0 24px; border-top: 1px solid var(--line); }
  .support h2 { font-size: 1.5rem; font-weight: 800; margin: 0 0 .3rem; letter-spacing: .04em; }
  .support .sec-lead { color: var(--muted); margin: 0 0 2rem; }
  .support-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
  .support-grid h3 { margin: 0 0 .3rem; font-size: 1.02rem; }
  .support-grid p { margin: 0 0 1.1rem; color: var(--text); }
  .support-grid .muted { color: var(--muted); font-size: .93rem; }
  .support-grid a { color: var(--brand); }

  /* ── 結尾 CTA + Footer ───────────────── */
  .closing { text-align: center; padding: 88px 0 96px; }
  .closing h2 {
    font-size: clamp(1.7rem, 4.4vw, 3rem); font-weight: 900;
    letter-spacing: .12em; text-indent: .12em; margin: 0 0 1.6rem;
  }
  footer { border-top: 1px solid var(--line); padding: 34px 0 58px; color: var(--muted); font-size: .92rem; }
  footer .cols { display: flex; flex-wrap: wrap; gap: 18px 26px; margin-bottom: 1rem; }
  footer a { color: var(--muted); text-decoration: none; }
  footer a:hover { color: var(--text); }

  /* ── Lightbox ─────────────────────────── */
  .lightbox {
    position: fixed; inset: 0; z-index: 100;
    display: none; align-items: center; justify-content: center;
    background: rgba(12, 11, 8, .82);
    backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
    cursor: zoom-out; padding: 4vh 4vw;
  }
  .lightbox.open { display: flex; }
  .lightbox img {
    max-width: 100%; max-height: 92vh; width: auto; height: auto;
    border-radius: 22px; box-shadow: 0 24px 80px rgba(0, 0, 0, .55);
    animation: lb-in .22s ease;
  }
  .lightbox .hint {
    position: fixed; bottom: 18px; left: 0; right: 0;
    text-align: center; color: rgba(255, 255, 255, .65); font-size: .85rem;
  }
  @keyframes lb-in { from { opacity: 0; transform: scale(.94); } to { opacity: 1; transform: scale(1); } }

  @media (max-width: 820px) {
    .cards, .card.full .split { grid-template-columns: 1fr; }
    .card.full .split { text-align: center; }
    .card.full .split .copy { padding: 0 0 10px; }
    .card.full .split .shot-well { justify-content: center; }
    .stat-grid { grid-template-columns: 1fr 1fr; gap: 28px 12px; }
    .support-grid { grid-template-columns: 1fr; gap: 26px; }
    .band { padding: 36px 26px; }
    .hero { padding: 64px 0 48px; }
    .nav .navlink { display: none; }
    .nav .navlink.lang { display: inline-block; }
    .nav .navlink.guide { display: inline-block; }
    .nav { gap: 8px; padding: 10px 10px 10px 14px; }
    .nav .navlink { padding: 6px 6px; }
  }

  /* ── 操作說明頁(/guide)── */
  .guide { padding: 14px 0 10px; }
  .guide h2 {
    font-size: clamp(1.25rem, 2.6vw, 1.65rem); font-weight: 900;
    letter-spacing: .04em; margin: 0 0 1rem;
    padding-top: 26px; border-top: 1px solid var(--line);
  }
  .guide ol { margin: 0 0 1rem; padding-left: 1.35em; color: var(--muted); }
  .guide ol li { margin: .55rem 0; line-height: 1.7; }
  .guide li strong, .guide p strong { color: var(--text); }
  .guide .muted { color: var(--muted); font-size: .92rem; }
  .guide .faq { padding: 6px 0 10px; max-width: none; }
  .guide .faq summary { font-size: 1rem; }
  .guide-hero { padding-bottom: 26px; }
  .guide-hero h1 { font-size: clamp(1.7rem, 4vw, 2.6rem); }
  .guide-split {
    display: grid; grid-template-columns: 1.5fr 1fr;
    gap: 30px; align-items: center;
  }
  .guide-split .shot-well { display: flex; justify-content: center; }
  .guide-split .phone {
    width: min(240px, 82%); border-radius: 26px;
    box-shadow: 0 10px 30px rgba(72, 52, 24, .14);
    overflow: hidden; line-height: 0; cursor: zoom-in;
  }
  @media (max-width: 820px) {
    .guide-split { grid-template-columns: 1fr; }
    .guide-split .shot-well { order: 2; }
  }

  /* ── /guide 同行邀請三步驟(方向 A:卡片三連)── */
  .guide-steps-panel {
    background: var(--card); color: var(--text);
    border: 1px solid var(--line); border-radius: 30px;
    padding: 44px 44px 40px; margin-top: 22px;
  }
  .guide-steps-panel h2 { border-top: none; padding-top: 0; margin: 10px 0 8px; color: var(--text); }
  .steps-chip {
    display: inline-flex; align-items: center;
    background: var(--band); color: var(--band-text);
    border-radius: 100px; padding: 5px 14px;
    font-size: .82rem; font-weight: 700; letter-spacing: .06em;
  }
  .steps-lead { margin: 0; max-width: 44em; color: var(--muted); font-size: .97rem; }
  .steps-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; margin-top: 26px; }
  .step-card {
    background: var(--card-deep); border: 1px solid var(--line);
    border-radius: 20px; padding: 22px; display: flex; flex-direction: column; gap: 13px;
  }
  .step-head { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: .97rem; }
  .step-num {
    width: 26px; height: 26px; border-radius: 100px; flex: none;
    background: var(--brand); color: var(--brand-ink);
    font-size: .88rem; font-weight: 800;
    display: flex; align-items: center; justify-content: center;
  }
  .step-mock {
    background: var(--card); border: 1px solid var(--line);
    border-radius: 14px; padding: 14px 16px;
    display: flex; flex-direction: column; gap: 8px; flex: 1; justify-content: center;
  }
  .mock-title { font-size: .92rem; font-weight: 700; line-height: 1.4; }
  .mock-sub { font-size: .8rem; color: var(--muted); line-height: 1.4; }
  .mock-avatars { display: flex; align-items: center; gap: 8px; margin-top: 2px; }
  .mock-avatars img, .mock-invite img {
    width: 30px; height: 30px; border-radius: 100px; object-fit: cover; flex: none;
  }
  .avatar-add {
    width: 30px; height: 30px; border-radius: 100px; box-sizing: border-box;
    border: 1.5px dashed var(--muted); color: var(--muted);
    display: flex; align-items: center; justify-content: center; font-size: 1rem;
  }
  .mock-invite { display: flex; align-items: center; gap: 10px; }
  .mock-actions { display: flex; gap: 8px; }
  .mock-accept {
    background: var(--brand); color: var(--brand-ink);
    border-radius: 100px; padding: 5px 18px; font-size: .82rem; font-weight: 800;
  }
  .mock-decline {
    border: 1px solid var(--line); color: var(--muted);
    border-radius: 100px; padding: 5px 14px; font-size: .82rem; font-weight: 600;
  }
  .step-mock.mock-upcoming {
    background: var(--band); color: var(--band-text); border: none;
    flex-direction: row; align-items: center; justify-content: space-between;
  }
  .mock-eyebrow { font-size: .74rem; font-weight: 700; letter-spacing: .08em; color: #a8d3a0; }
  .mock-title-light { font-size: .92rem; font-weight: 700; color: var(--band-text); }
  .mock-countdown { font-size: 1.55rem; font-weight: 800; color: #7fc984; line-height: 1; }
  .step-note { font-size: .82rem; color: var(--muted); line-height: 1.6; }
  @media (max-width: 820px) {
    .guide-steps-panel { padding: 30px 24px; }
    .steps-grid { grid-template-columns: 1fr; }
  }

  /* 操作說明入口:hero 次要按鈕 + 導覽列品牌色 */
  .guide-cta-row { margin: 14px 0 0; }
  .btn.btn-ghost {
    background: transparent; color: var(--brand);
    border: 1.5px solid var(--brand);
  }
  .btn.btn-ghost:hover { background: var(--brand); color: var(--brand-ink); }
  .nav .navlink.guide { color: var(--brand); }