:root {
  color-scheme: light dark;
  --canvas: #f5f7fb;
  --surface: rgba(255, 255, 255, 0.86);
  --surface-solid: #ffffff;
  --text: #10131a;
  --muted: #5f6673;
  --line: rgba(16, 19, 26, 0.11);
  --accent: #315ba8;
  --accent-soft: #e8efff;
  --safe: #16664c;
  --shadow: 0 18px 54px rgba(25, 45, 82, 0.1);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Noto Sans TC", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--canvas);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background:
    radial-gradient(circle at 12% -12%, rgba(74, 111, 183, 0.18), transparent 34rem),
    radial-gradient(circle at 100% 4%, rgba(120, 95, 196, 0.1), transparent 30rem),
    var(--canvas);
  font-size: 1rem;
  line-height: 1.7;
}

a {
  color: var(--accent);
  text-underline-offset: 0.18em;
}

a:hover {
  text-decoration-thickness: 0.12em;
}

.shell {
  width: min(100% - 2rem, 70rem);
  margin: 0 auto;
}

header {
  position: sticky;
  z-index: 10;
  top: 0;
  border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--canvas) 82%, transparent);
  backdrop-filter: blur(20px) saturate(150%);
}

.nav {
  min-height: 4.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.72rem;
  color: var(--text);
  font-weight: 720;
  text-decoration: none;
  letter-spacing: -0.02em;
}

.mark {
  display: grid;
  grid-template-columns: repeat(2, 0.58rem);
  gap: 0.16rem;
  padding: 0.44rem;
  border-radius: 0.72rem;
  background: linear-gradient(145deg, #273f78, #4775ca);
  box-shadow: 0 6px 18px rgba(49, 91, 168, 0.28);
}

.mark span {
  aspect-ratio: 1;
  border-radius: 0.16rem;
  background: #fff;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.nav-links a {
  padding: 0.48rem 0.72rem;
  border-radius: 0.7rem;
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 620;
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--accent);
  background: var(--accent-soft);
}

main {
  padding: clamp(3rem, 7vw, 6.5rem) 0 5rem;
}

.hero {
  max-width: 48rem;
}

.eyebrow {
  margin: 0 0 0.8rem;
  color: var(--accent);
  font-size: 0.83rem;
  font-weight: 760;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  margin-top: 0;
  line-height: 1.16;
  letter-spacing: -0.035em;
}

h1 {
  margin-bottom: 1.15rem;
  font-size: clamp(2.45rem, 7vw, 5rem);
}

h2 {
  margin-bottom: 1rem;
  font-size: clamp(1.55rem, 3vw, 2.15rem);
}

h3 {
  margin-bottom: 0.55rem;
  font-size: 1.08rem;
}

.lead {
  margin: 0;
  max-width: 42rem;
  color: var(--muted);
  font-size: clamp(1.08rem, 2vw, 1.28rem);
}

.actions,
.grid {
  display: grid;
  gap: 1rem;
}

.actions {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 2.4rem;
}

.grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 2rem;
}

.card,
.action-card,
.notice {
  border: 1px solid var(--line);
  border-radius: 1.35rem;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.action-card {
  display: block;
  min-height: 11rem;
  padding: 1.55rem;
  color: var(--text);
  text-decoration: none;
  transition: transform 180ms ease, border-color 180ms ease;
}

.action-card:hover {
  transform: translateY(-0.2rem);
  border-color: color-mix(in srgb, var(--accent) 46%, var(--line));
}

.action-card p,
.card p,
.card ul {
  margin-bottom: 0;
  color: var(--muted);
}

.glyph {
  display: inline-grid;
  width: 2.25rem;
  height: 2.25rem;
  margin-bottom: 1.35rem;
  place-items: center;
  border-radius: 0.72rem;
  color: var(--accent);
  background: var(--accent-soft);
  font-size: 1.2rem;
  font-weight: 750;
}

.section {
  margin-top: clamp(3rem, 7vw, 5.6rem);
}

.card {
  padding: 1.45rem;
}

.card ul,
.content ul,
.content ol {
  padding-left: 1.25rem;
}

.content {
  max-width: 48rem;
}

.content section {
  margin-top: 3.2rem;
  scroll-margin-top: 6rem;
}

.content p,
.content li {
  color: var(--muted);
}

.content strong {
  color: var(--text);
}

.notice {
  margin-top: 2rem;
  padding: 1.2rem 1.35rem;
  border-left: 0.28rem solid var(--safe);
  box-shadow: none;
}

.notice p {
  margin: 0;
}

.lang-block {
  margin-top: 3.5rem;
  padding-top: 3rem;
  border-top: 1px solid var(--line);
}

.meta {
  color: var(--muted);
  font-size: 0.92rem;
}

footer {
  padding: 2rem 0 3rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

.footer-row {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

@media (max-width: 42rem) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 0.8rem 0;
  }

  .nav-links {
    width: 100%;
  }

  .nav-links a {
    flex: 1;
    text-align: center;
  }

  .actions,
  .grid {
    grid-template-columns: 1fr;
  }

  main {
    padding-top: 2.6rem;
  }
}

@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #0e1118;
    --surface: rgba(24, 29, 40, 0.88);
    --surface-solid: #181d28;
    --text: #f4f6fb;
    --muted: #b2bac8;
    --line: rgba(244, 246, 251, 0.12);
    --accent: #8eb4ff;
    --accent-soft: #1b2b4c;
    --safe: #69d7aa;
    --shadow: 0 18px 54px rgba(0, 0, 0, 0.25);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .action-card {
    transition: none;
  }
}