:root {
  --bg: #f7f5f2;
  --bg-wash: #fff7ef;
  --ink: #2a2420;
  --muted: #6f6861;
  --brand: #ff6f61;
  --accent: #e5484d;
  --accent-text: #8f3437;
  --card: #ffffff;
  --surface: #fbfaf8;
  --border: #e5e1db;
  --border-strong: #d5d0c8;
  --teal: #0f9f91;
  --glass: rgba(255, 255, 255, 0.72);
  --elev-1: 0 1px 2px rgba(42, 36, 32, 0.06), 0 1px 4px rgba(42, 36, 32, 0.04);
  --elev-2: 0 10px 28px rgba(42, 36, 32, 0.08), 0 2px 8px rgba(42, 36, 32, 0.04);
  --ease-out: cubic-bezier(0.23, 1, 0.32, 1);
  --dur-fast: 140ms;
  --dur-med: 200ms;
  --display: "Nunito", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "PingFang SC", "Hiragino Sans", "Apple SD Gothic Neo", "Noto Sans TC", sans-serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "PingFang SC", "Hiragino Sans", "Apple SD Gothic Neo", "Noto Sans TC", sans-serif;
  --focus: #e5484d;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161310;
    --bg-wash: #1c1814;
    --ink: #f4efe8;
    --muted: #b4ada4;
    --card: #221e1a;
    --surface: #1b1815;
    --border: #3a342e;
    --border-strong: #4a433c;
    --glass: rgba(34, 30, 26, 0.78);
    --elev-1: 0 1px 2px rgba(0, 0, 0, 0.28);
    --elev-2: 0 16px 40px rgba(0, 0, 0, 0.36);
  }
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% -10%, rgba(255, 111, 97, 0.14), transparent 36%),
    radial-gradient(circle at 88% 0%, rgba(15, 159, 145, 0.08), transparent 30%),
    linear-gradient(180deg, var(--bg-wash) 0%, var(--bg) 42%, var(--bg) 100%);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: var(--accent-text); text-decoration-thickness: 1px; text-underline-offset: 3px; }
@media (prefers-color-scheme: dark) {
  a { color: #ff8d84; }
}

:where(a, button, summary, [role="button"]):focus { outline: none; }
:where(a, button, summary, [role="button"]):focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: 8px;
}
:where(button, a.btn):active:not(:disabled) {
  transform: scale(0.97);
}

.shell { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.legal-shell { width: min(760px, calc(100% - 40px)); margin: 0 auto; }

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--glass);
  backdrop-filter: blur(16px) saturate(160%);
  -webkit-backdrop-filter: blur(16px) saturate(160%);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 64px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  text-decoration: none;
  font-family: var(--display);
  font-weight: 800;
  font-size: 22px;
  letter-spacing: -0.03em;
}
.brand img { width: 34px; height: 34px; border-radius: 9px; }
.nav-links {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}
.nav-links a {
  color: var(--muted);
  text-decoration: none;
  padding: 8px 10px;
  border-radius: 10px;
  font-size: 15px;
}
@media (hover: hover) and (pointer: fine) {
  .nav-links a:hover { color: var(--ink); background: var(--surface); }
}
.nav-links a.is-current { color: var(--ink); font-weight: 600; }
.lang-switch {
  display: inline-flex;
  flex-wrap: wrap;
  margin-left: 8px;
  padding: 3px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card);
}
.lang-btn {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 5px 8px;
  border-radius: 999px;
  font: inherit;
  font-size: 12px;
  font-weight: 650;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out), transform var(--dur-fast) var(--ease-out);
}
.lang-btn.is-active { background: var(--ink); color: var(--bg); }

.page-hero { padding: 48px 0 12px; }
.kicker {
  margin: 0 0 10px;
  color: var(--accent-text);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}
.page-hero h1 {
  margin: 0 0 12px;
  font-family: var(--display);
  font-size: clamp(2rem, 4vw, 2.75rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
}
.lede { margin: 0; color: var(--muted); font-size: 1.05rem; max-width: 40rem; }
.updated { margin: 14px 0 0; color: var(--muted); font-size: 14px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: var(--elev-1);
  padding: 22px 24px;
}
.card + .card, .stack > * + * { margin-top: 14px; }

.faq {
  display: grid;
  gap: 12px;
}
.faq details {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 4px 18px 4px;
  box-shadow: var(--elev-1);
}
.faq summary {
  cursor: pointer;
  list-style: none;
  padding: 14px 0;
  font-weight: 650;
}
.faq summary::-webkit-details-marker { display: none; }
.faq details p { margin: 0 0 16px; color: var(--muted); }

.prose { padding: 8px 0 72px; }
.prose h2 {
  margin: 2.2rem 0 0.7rem;
  font-size: 1.2rem;
  letter-spacing: -0.02em;
}
.prose p, .prose li { color: var(--ink); }
.prose ul { padding-left: 1.2rem; }
.prose li + li { margin-top: 0.4rem; }
.prose code {
  font-size: 0.92em;
  background: rgba(128, 128, 128, 0.12);
  padding: 0.1em 0.4em;
  border-radius: 6px;
}

.contact-row {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 24px;
  align-items: center;
  justify-content: space-between;
}
.contact-row > div { flex: 1 1 260px; }
.contact-row > div p { margin: 6px 0 0; }
.contact-row a {
  font-weight: 750;
  font-size: 1.15rem;
  color: var(--ink);
  text-decoration: none;
}
.muted { color: var(--muted); }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 16px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--ink);
  text-decoration: none;
  font-weight: 650;
  box-shadow: var(--elev-1);
  transition: transform var(--dur-fast) var(--ease-out), box-shadow var(--dur-med) var(--ease-out), background var(--dur-med) var(--ease-out);
}
/* 深色模式 --ink 是米白:字一定要用 --bg,不能寫死白色(白字配米白底看不到) */
.btn.primary { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.contact-row a.btn { font-size: 1rem; font-weight: 650; color: var(--bg); padding: 0 20px; }
@media (hover: hover) and (pointer: fine) {
  .btn:hover { box-shadow: var(--elev-2); }
}

.footer {
  border-top: 1px solid var(--border);
  padding: 28px 0 40px;
  color: var(--muted);
  font-size: 14px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}
.footer a { color: var(--muted); text-decoration: none; }
.footer-links { display: flex; flex-wrap: wrap; gap: 14px 18px; }

@media (max-width: 720px) {
  body { font-size: 16px; }
  .nav { min-height: 58px; }
  .nav-links a { padding: 8px 7px; font-size: 14px; }
  .lang-switch { margin-left: 0; }
  .page-hero { padding-top: 32px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition-duration: 0.01ms !important; }
}
@media (prefers-reduced-transparency: reduce) {
  .topbar { background: var(--card); backdrop-filter: none; }
}