/* ── Design tokens: light default, dark via system preference or toggle ── */
  :root {
    color-scheme: light dark;
    --bg: #f8f5ee;
    --surface: #fffdf8;
    --surface-2: #eee7da;
    --text: #26312d;
    --muted: #64746c;
    --line: rgba(38, 49, 45, 0.12);
    --accent: #3f8068;
    --accent-2: #b58a3e;
    --primary: #34745f;
    --primary-contrast: #fffdf8;
    --mark-filter: none;
    --shadow: 0 18px 52px rgba(72, 80, 67, 0.13);
  }
  @media (prefers-color-scheme: dark) {
    :root:not([data-theme="day"]) {
      --bg: #101816;
      --surface: #17211e;
      --surface-2: #20302a;
      --text: #f1f7f2;
      --muted: #b2c2ba;
      --line: rgba(241, 247, 242, 0.12);
      --accent: #7fd3b1;
      --accent-2: #d4b16a;
      --primary: #9fdcc4;
      --primary-contrast: #10201a;
      --mark-filter: invert(92%) sepia(15%) saturate(287%) hue-rotate(103deg) brightness(104%) contrast(94%);
      --shadow: 0 22px 64px rgba(0, 0, 0, 0.28);
    }
  }
  :root[data-theme="night"] {
    --bg: #101816;
    --surface: #17211e;
    --surface-2: #20302a;
    --text: #f1f7f2;
    --muted: #b2c2ba;
    --line: rgba(241, 247, 242, 0.12);
    --accent: #7fd3b1;
    --accent-2: #d4b16a;
    --primary: #9fdcc4;
    --primary-contrast: #10201a;
    --mark-filter: invert(92%) sepia(15%) saturate(287%) hue-rotate(103deg) brightness(104%) contrast(94%);
    --shadow: 0 22px 64px rgba(0, 0, 0, 0.28);
  }
  :root[data-theme="day"] {
    color-scheme: light;
    --bg: #f8f5ee;
    --surface: #fffdf8;
    --surface-2: #eee7da;
    --text: #26312d;
    --muted: #64746c;
    --line: rgba(38, 49, 45, 0.12);
    --accent: #3f8068;
    --accent-2: #b58a3e;
    --primary: #34745f;
    --primary-contrast: #fffdf8;
    --mark-filter: none;
    --shadow: 0 18px 52px rgba(72, 80, 67, 0.13);
  }
  * { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body {
    margin: 0;
    font-family: "Manrope", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", "Heiti TC", ui-sans-serif, system-ui, sans-serif;
    background:
      radial-gradient(circle at top left, color-mix(in srgb, var(--accent) 11%, transparent), transparent 34rem),
      radial-gradient(circle at 85% 8%, color-mix(in srgb, var(--accent-2) 12%, transparent), transparent 28rem),
      var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100dvh;
  }
  a { color: inherit; }
  .site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    padding: .9rem clamp(1rem, 4vw, 4rem);
    backdrop-filter: blur(18px);
    background: color-mix(in srgb, var(--bg) 78%, transparent);
    border-bottom: 1px solid var(--line);
  }
  .brand { display: inline-flex; align-items: center; gap: .75rem; text-decoration: none; font-weight: 800; letter-spacing: -.02em; }
  .brand-mark { width: 2.2rem; height: 2.2rem; object-fit: contain; filter: var(--mark-filter); }
  .header-nav { display: flex; align-items: center; gap: 1.5rem; }
  .header-nav a { text-decoration: none; color: var(--muted); font-size: .92rem; }
  .header-nav a:hover { color: var(--text); }
  .header-nav a[aria-current="page"] { color: var(--text); font-weight: 700; }
  .theme-toggle {
    width: 2.5rem; height: 2.5rem;
    border: 1px solid var(--line);
    background: color-mix(in srgb, var(--surface) 86%, transparent);
    color: var(--text);
    border-radius: 999px;
    display: grid; place-items: center;
    cursor: pointer;
    backdrop-filter: blur(16px);
  }
  .theme-toggle .theme-icon { grid-area: 1 / 1; width: 1.1rem; height: 1.1rem; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; transition: opacity .18s ease, transform .18s ease; }
  .theme-toggle .sun circle { fill: currentColor; stroke: none; }
  /* Show moon icon when dark, sun icon when light */
  .theme-toggle .moon { opacity: 1; transform: scale(1) rotate(0deg); }
  .theme-toggle .sun { opacity: 0; transform: scale(.7) rotate(-20deg); }
  :root[data-theme="day"] .theme-toggle .moon,
  :root[data-theme="day"] .theme-toggle .sun { transition: opacity .18s ease, transform .18s ease; }
  :root[data-theme="day"] .theme-toggle .moon { opacity: 0; transform: scale(.7) rotate(-20deg); }
  :root[data-theme="day"] .theme-toggle .sun { opacity: 1; transform: scale(1) rotate(0deg); }
  /* When system is light (no forced theme), show sun */
  @media (prefers-color-scheme: light) {
    :root:not([data-theme="night"]) .theme-toggle .moon { opacity: 0; transform: scale(.7) rotate(-20deg); }
    :root:not([data-theme="night"]) .theme-toggle .sun { opacity: 1; transform: scale(1) rotate(0deg); }
  }
  .page-wrap { width: min(1000px, calc(100% - 2rem)); margin: 0 auto; padding: clamp(3rem, 7vw, 5rem) 0; }
  .eyebrow { margin: 0 0 .9rem; color: var(--accent); text-transform: uppercase; letter-spacing: .16em; font-size: .78rem; font-weight: 850; }
  h1 { font-family: "Noto Sans TC", "PingFang TC", "Manrope", sans-serif; font-size: clamp(1.9rem, 5vw, 3rem); line-height: 1.2; letter-spacing: -.01em; margin: 0 0 .6rem; }
  .page-lead { color: var(--muted); font-size: 1.05rem; margin: 0 0 3rem; max-width: 46rem; }
  .tools-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1rem; }
  .tool-card {
    display: flex; flex-direction: column; gap: .6rem;
    padding: 1.5rem;
    background: linear-gradient(160deg, color-mix(in srgb, var(--surface) 90%, transparent), color-mix(in srgb, var(--surface-2) 58%, transparent));
    border: 1px solid var(--line);
    border-radius: 1.2rem;
    text-decoration: none;
    transition: transform .2s ease, border-color .2s ease;
    box-shadow: var(--shadow);
  }
  .tool-card:hover { transform: translateY(-2px); border-color: color-mix(in srgb, var(--accent) 40%, transparent); }
  .tool-card.coming-soon { opacity: .55; cursor: default; pointer-events: none; }
  .tool-tag {
    display: inline-flex; align-items: center;
    padding: .22rem .65rem;
    border-radius: 999px;
    font-size: .72rem; font-weight: 800; letter-spacing: .06em; text-transform: uppercase;
    background: color-mix(in srgb, var(--accent) 14%, transparent);
    color: var(--accent);
    border: 1px solid color-mix(in srgb, var(--accent) 28%, transparent);
    width: fit-content;
  }
  .tool-tag.soon {
    background: color-mix(in srgb, var(--muted) 10%, transparent);
    color: var(--muted);
    border-color: color-mix(in srgb, var(--muted) 22%, transparent);
  }
  .tool-title { font-family: "Noto Sans TC", "PingFang TC", "Manrope", sans-serif; font-size: 1.15rem; font-weight: 700; margin: 0; }
  .tool-desc { color: var(--muted); font-size: .9rem; margin: 0; line-height: 1.55; }
  .tool-arrow { color: var(--accent); font-size: 1rem; margin-top: auto; padding-top: .4rem; }
  .service-cta {
    width: min(1000px, calc(100% - 2rem));
    margin: 0 auto 2rem;
    padding: 1.25rem;
    border: 1px solid var(--line);
    border-radius: 1.2rem;
    background: color-mix(in srgb, var(--surface) 82%, transparent);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    box-shadow: var(--shadow);
  }
  .service-cta p { margin: .15rem 0 0; color: var(--muted); }
  .service-cta strong { display: block; }
  .service-cta a {
    flex: none;
    text-decoration: none;
    color: var(--primary-contrast);
    background: var(--primary);
    font-weight: 800;
    border-radius: 999px;
    padding: .75rem 1rem;
  }
  footer { width: min(1000px, calc(100% - 2rem)); margin: 0 auto; padding: 2rem 0 3rem; color: var(--muted); border-top: 1px solid var(--line); display: flex; justify-content: space-between; align-items: center; gap: 1rem; font-size: .9rem; }
  @media (max-width: 600px) {
    .header-nav a { display: none; }
    .service-cta { flex-direction: column; align-items: flex-start; }
    .service-cta a { width: 100%; text-align: center; }
    footer { flex-direction: column; align-items: flex-start; }
  }