:root {
  --bg: #0d1117;
  --bg-card: #161b22;
  --bg-hover: #1c2333;
  --border: #30363d;
  --border-bright: #4d5b6b;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --accent: #58a6ff;
  --accent2: #7ee787;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 24px rgba(0,0,0,.25);
  color-scheme: dark;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html { scroll-behavior: smooth; }

body {
  font-family: system-ui, -apple-system, "Segoe UI", "Noto Sans TC", "PingFang TC", "Microsoft JhengHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  margin: 0;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

main { max-width: 920px; margin: 0 auto; padding: 0 1.25rem 1rem; }

/* ---------- hero ---------- */
.hero {
  position: relative;
  max-width: 920px;
  margin: 0 auto;
  padding: clamp(3rem, 9vw, 5.5rem) 1.25rem 2.5rem;
  overflow: visible;
}
.hero-inner { position: relative; z-index: 1; }
.glow {
  position: absolute;
  top: -40%; right: -10%;
  width: 420px; height: 420px;
  background: radial-gradient(circle, rgba(88,166,255,.16) 0%, transparent 65%);
  pointer-events: none;
}
.kicker {
  font-family: ui-monospace, SFMono-Regular, monospace;
  color: var(--accent);
  font-size: .78rem;
  letter-spacing: .18em;
  margin: 0 0 .6rem;
}
.hero h1 {
  font-size: clamp(2.3rem, 7vw, 3.4rem);
  line-height: 1.15;
  letter-spacing: -.02em;
  margin: 0 0 .6rem;
}
.accent {
  background: linear-gradient(120deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.tagline { color: var(--text-dim); font-size: 1.05rem; margin: 0; max-width: 34em; }

/* ---------- section head + search ---------- */
.section-head {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin: 1.8rem 0 1.1rem;
}
.section-title { font-size: 1.2rem; margin: 0; letter-spacing: -.01em; }
.search-wrap { flex: 1; min-width: 200px; max-width: 320px; margin-left: auto; }
#search {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  padding: .55rem .9rem;
  font-size: .95rem;
  font-family: inherit;
  transition: border-color .15s, box-shadow .15s;
}
#search:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(88,166,255,.18);
}
#search::placeholder { color: var(--text-dim); }

/* ---------- grid ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(250px, 100%), 1fr));
  gap: 1rem;
}

.card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.15rem 1.25rem;
  text-decoration: none;
  color: var(--text);
  box-shadow: var(--shadow);
  transition: border-color .18s, transform .18s, background .18s;
}
@media (hover: hover) {
  a.card:hover {
    border-color: var(--accent);
    background: var(--bg-hover);
    transform: translateY(-3px);
  }
  a.card:hover .arrow { transform: translateX(4px); }
}
a.card:active { transform: scale(.98); }
a.card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
.card h3 { margin: 0 0 .35rem; font-size: 1.08rem; letter-spacing: -.01em; }
.card p {
  margin: 0 0 1rem;
  color: var(--text-dim);
  font-size: .9rem;
  flex: 1;
}
.card-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: .5rem;
  flex-wrap: wrap;
}

.tag {
  display: inline-block;
  font-size: .72rem;
  font-family: ui-monospace, monospace;
  color: var(--accent2);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: .08rem .6rem;
  margin: .1rem .3rem .1rem 0;
  white-space: nowrap;
}
.arrow { color: var(--accent); transition: transform .18s; }

.empty { color: var(--text-dim); padding: 2rem 0; text-align: center; }

code {
  font-family: ui-monospace, monospace;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: .1rem .4rem;
  font-size: .85em;
}

/* ---------- footer ---------- */
footer {
  max-width: 920px;
  margin: 3rem auto 0;
  padding: 1.4rem 1.25rem calc(1.8rem + env(safe-area-inset-bottom));
  border-top: 1px solid var(--border);
  color: var(--text-dim);
  font-size: .85rem;
}
footer p { margin: 0; }
footer a { color: var(--accent); text-decoration: none; }
footer a:hover { text-decoration: underline; }
.dot {
  display: inline-block;
  width: 7px; height: 7px;
  background: var(--accent2);
  border-radius: 50%;
  margin-right: .45rem;
}

/* ---------- skeleton loading ---------- */
.skeleton { min-height: 8rem; }
.sk-line {
  height: .95rem;
  border-radius: 5px;
  background: var(--border);
  margin: .4rem 0;
  animation: pulse 1.2s ease-in-out infinite;
}
.sk-line.short { width: 55%; }
@keyframes pulse { 50% { opacity: .4; } }

/* ---------- small screens ---------- */
@media (max-width: 480px) {
  .section-head { margin-top: 1.4rem; }
  .search-wrap { max-width: none; width: 100%; order: 3; flex-basis: 100%; }
  .grid { gap: .75rem; }
  .card { padding: 1rem 1.05rem; }
  .card:active { transform: scale(.985); }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
}