:root {
  --bg-deep: #070a10;
  --bg-mid: #0f1624;
  --glass-bg: rgba(22, 32, 48, 0.55);
  --glass-border: rgba(120, 160, 220, 0.18);
  --text: #eef3fb;
  --muted: #94a3b8;
  --accent: #38bdf8;
  --accent-strong: #0ea5e9;
  --radius-lg: 20px;
  --radius-md: 14px;
  --shadow-card: 0 12px 40px rgba(0, 0, 0, 0.35);
  --font-display: "Outfit", system-ui, sans-serif;
  --font-body: "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  background: var(--bg-deep);
  color: var(--text);
  line-height: 1.55;
  position: relative;
}

.page-bg {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(ellipse 100% 80% at 15% 10%, rgba(56, 189, 248, 0.12), transparent 50%),
    radial-gradient(ellipse 80% 60% at 90% 30%, rgba(167, 139, 250, 0.1), transparent 45%),
    radial-gradient(ellipse 70% 50% at 50% 100%, rgba(34, 211, 238, 0.08), transparent 40%),
    linear-gradient(165deg, var(--bg-deep) 0%, var(--bg-mid) 45%, #0a0e18 100%);
}

.page-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.04;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  pointer-events: none;
}

.glass {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

@supports ((-webkit-backdrop-filter: blur(12px)) or (backdrop-filter: blur(12px))) {
  .glass {
    -webkit-backdrop-filter: blur(14px) saturate(1.2);
    backdrop-filter: blur(14px) saturate(1.2);
    background: rgba(22, 32, 48, 0.42);
  }
}

.wrap {
  max-width: 1040px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

.hero {
  text-align: center;
  margin-bottom: 1.75rem;
  padding: 2rem 1.5rem 1.75rem;
}

.hero-kicker {
  margin: 0 0 0.5rem;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  opacity: 0.95;
}

.hero h1 {
  margin: 0 0 0.65rem;
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 4.2vw, 2.05rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.hero .sub {
  margin: 0;
  color: var(--muted);
  font-size: 1.02rem;
}

.section {
  margin-bottom: 2.5rem;
}

.section h2 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.04em;
}

.section-lead {
  margin: 0 0 1.1rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.section-lead code {
  font-size: 0.9em;
  color: var(--accent);
}

.grid {
  display: grid;
  gap: 1.15rem;
  grid-template-columns: 1fr;
}

@media (min-width: 560px) {
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .grid {
    gap: 1.25rem;
  }
}

.card {
  position: relative;
  display: flex;
  flex-direction: row;
  align-items: stretch;
  min-height: 7.5rem;
  overflow: hidden;
  padding: 0;
  border-radius: var(--radius-md);
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(18, 26, 40, 0.75);
  text-decoration: none;
  color: inherit;
  box-shadow: var(--shadow-card);
  transition:
    transform 0.25s ease,
    border-color 0.25s ease,
    box-shadow 0.25s ease;
}

.card:hover {
  transform: translateY(-3px);
  border-color: rgba(56, 189, 248, 0.25);
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.45);
}

.card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.card-shine {
  position: absolute;
  inset: -50%;
  background: linear-gradient(
    115deg,
    transparent 35%,
    rgba(255, 255, 255, 0.06) 48%,
    rgba(255, 255, 255, 0.12) 50%,
    rgba(255, 255, 255, 0.06) 52%,
    transparent 65%
  );
  transform: translateX(-100%) rotate(0.001deg);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.2s ease;
}

@media (prefers-reduced-motion: no-preference) {
  .card:hover .card-shine {
    opacity: 1;
    animation: card-shine-sweep 1.1s ease forwards;
  }
}

@keyframes card-shine-sweep {
  from {
    transform: translateX(-100%) rotate(0.001deg);
  }
  to {
    transform: translateX(100%) rotate(0.001deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  .card:hover {
    transform: none;
  }

  .card-shine {
    display: none;
  }
}

.card-thumb {
  flex: 0 0 5.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.35rem;
  line-height: 1;
  border-right: 1px solid rgba(255, 255, 255, 0.06);
}

.card--cat-hub .card-thumb {
  background: linear-gradient(160deg, rgba(56, 189, 248, 0.35), rgba(129, 140, 248, 0.2));
}

.card--cat-board .card-thumb {
  background: linear-gradient(160deg, rgba(52, 211, 153, 0.35), rgba(16, 185, 129, 0.15));
}

.card--cat-puzzle .card-thumb {
  background: linear-gradient(160deg, rgba(167, 139, 250, 0.4), rgba(139, 92, 246, 0.2));
}

.card--cat-action .card-thumb {
  background: linear-gradient(160deg, rgba(251, 146, 60, 0.4), rgba(249, 115, 22, 0.2));
}

.card--cat-build .card-thumb {
  background: linear-gradient(160deg, rgba(74, 222, 128, 0.35), rgba(120, 113, 108, 0.35));
}

.card-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 1rem 1.15rem 1rem 1rem;
  min-width: 0;
}

.card h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.card p {
  margin: 0;
  flex: 1;
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.5;
}

.card p code {
  font-size: 0.82em;
  word-break: break-all;
  color: rgba(148, 163, 184, 0.95);
}

.card .warn {
  margin: 0.4rem 0 0;
  font-size: 0.78rem;
  color: #fbbf24;
}

.card-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 0.85rem;
  align-self: flex-start;
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.4rem 0.95rem;
  border-radius: 999px;
  color: var(--bg-deep);
  background: linear-gradient(135deg, #38bdf8, #22d3ee);
  box-shadow: 0 4px 16px rgba(34, 211, 238, 0.25);
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
}

.card:hover .card-cta {
  transform: translateX(2px);
  box-shadow: 0 6px 22px rgba(56, 189, 248, 0.4);
}

.card-cta-arrow {
  transition: transform 0.2s ease;
}

.card:hover .card-cta-arrow {
  transform: translateX(4px);
}

@media (prefers-reduced-motion: reduce) {
  .card:hover .card-cta,
  .card:hover .card-cta-arrow {
    transform: none;
  }
}

.site-footer {
  margin-top: 2.5rem;
  padding: 1.25rem 1.25rem;
  font-size: 0.85rem;
  color: var(--muted);
  text-align: center;
}

.site-footer code {
  color: var(--accent);
  font-size: 0.9em;
}