:root {
  color-scheme: dark;
  --bg: #07090b;
  --panel: rgba(16, 19, 23, 0.92);
  --panel-2: rgba(28, 32, 36, 0.78);
  --ink: #f5f3ee;
  --muted: #a7adb8;
  --line: rgba(255, 255, 255, 0.12);
  --gold: #f4b244;
  --gold-2: #ffd37a;
  --green: #57d29a;
  --danger: #ff7676;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans TC", sans-serif;
  background: var(--bg);
  color: var(--ink);
}

* { box-sizing: border-box; }
html { min-height: 100%; background: var(--bg); }
body {
  min-height: 100vh;
  margin: 0;
  background:
    radial-gradient(circle at 20% 0%, rgba(244, 178, 68, 0.14), transparent 34rem),
    radial-gradient(circle at 85% 28%, rgba(87, 210, 154, 0.08), transparent 30rem),
    linear-gradient(180deg, #11151a 0%, var(--bg) 42%);
  color: var(--ink);
  line-height: 1.7;
}

a { color: var(--gold-2); }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--green); outline-offset: 4px; }
.shell { width: min(100% - 32px, 960px); margin-inline: auto; }

.landing { min-height: 100vh; display: grid; place-items: center; padding-block: 48px; }
.hero-card, .article-card {
  border: 1px solid var(--line);
  background: linear-gradient(145deg, rgba(22, 25, 30, 0.96), rgba(9, 11, 14, 0.95));
  box-shadow: 0 30px 90px rgba(0, 0, 0, 0.48), inset 0 1px rgba(255, 255, 255, 0.04);
}
.hero-card { width: min(100%, 620px); padding: clamp(28px, 6vw, 64px); border-radius: 34px; text-align: center; }
.app-icon { display: block; margin: 0 auto 28px; border-radius: 30px; box-shadow: 0 18px 52px rgba(0, 0, 0, 0.5); }
.eyebrow { margin: 0 0 12px; color: var(--gold); font-size: 0.78rem; font-weight: 800; letter-spacing: 0.18em; }
h1 { margin: 0; font-size: clamp(2.65rem, 9vw, 5.2rem); line-height: 1.04; letter-spacing: -0.045em; }
.lead { margin: 24px auto 0; max-width: 42rem; color: var(--muted); font-size: clamp(1.05rem, 2.3vw, 1.3rem); }
.small, .footer-note { color: var(--muted); font-size: 0.88rem; }
.actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin: 34px 0 22px; }
.button {
  display: inline-flex;
  min-height: 50px;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  border: 1px solid var(--line);
  border-radius: 15px;
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
}
.button.primary { border-color: #f7c161; background: linear-gradient(180deg, #ffc45d, #e69a25); color: #211600; }
.button.secondary { background: rgba(255, 255, 255, 0.045); }

.topbar {
  position: sticky;
  top: 0;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px max(20px, calc((100vw - 960px) / 2));
  border-bottom: 1px solid var(--line);
  background: rgba(7, 9, 11, 0.88);
  backdrop-filter: blur(18px);
}
.brand { color: var(--ink); font-weight: 850; text-decoration: none; }
nav { display: flex; gap: 8px; }
nav a { padding: 7px 11px; border-radius: 10px; color: var(--muted); font-weight: 700; text-decoration: none; }
nav a[aria-current="page"] { background: rgba(244, 178, 68, 0.14); color: var(--gold-2); }

.article-shell { padding-block: clamp(32px, 6vw, 72px); }
.article-card { padding: clamp(26px, 6vw, 64px); border-radius: 30px; }
.article-card h1 { max-width: 760px; }
.article-card section { margin-top: 48px; padding-top: 34px; border-top: 1px solid var(--line); }
h2 { margin: 0 0 12px; font-size: clamp(1.35rem, 3vw, 1.8rem); letter-spacing: -0.02em; }
p, li { color: #c4c8d0; }
strong { color: var(--ink); }
ul { padding-left: 1.35rem; }
li + li { margin-top: 8px; }
details { border-top: 1px solid var(--line); padding: 18px 0; }
details:last-child { border-bottom: 1px solid var(--line); }
summary { color: var(--ink); font-weight: 800; cursor: pointer; }
details p { margin-bottom: 0; }
.contact-card, .summary-card { padding: 24px; border: 1px solid var(--line); border-radius: 20px; background: var(--panel-2); }
.contact-card .button { margin-top: 8px; }
.summary-card dl { display: grid; gap: 10px; margin: 0; }
.summary-card dl div { display: flex; justify-content: space-between; gap: 20px; padding: 10px 0; border-bottom: 1px solid var(--line); }
.summary-card dl div:last-child { border-bottom: 0; }
dt { color: var(--muted); }
dd { margin: 0; color: var(--green); font-weight: 850; }
.footer-note { margin: 48px 0 0; text-align: center; }

@media (max-width: 620px) {
  .topbar { align-items: flex-start; flex-direction: column; gap: 8px; }
  .article-card { border-radius: 22px; }
  .summary-card dl div { align-items: flex-start; flex-direction: column; gap: 2px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; }
}