:root {
  --bg: #ffffff;
  --fg: #1a1a1a;
  --muted: #666666;
  --line: #e2e2e2;
  --accent: #1a4d8f;
  --card: #fafafa;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --fg: #e8e8e8;
    --muted: #9aa0a6;
    --line: #2a2e35;
    --accent: #7cb0f0;
    --card: #1b1e24;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 0 1.5rem 4rem;
  background: var(--bg);
  color: var(--fg);
  font-family: "Noto Sans TC", -apple-system, "Segoe UI", system-ui, sans-serif;
  line-height: 1.75;
  font-size: 16px;
}

.hero {
  max-width: 720px;
  margin: 0 auto;
  padding: 5rem 0 3rem;
  border-bottom: 1px solid var(--line);
}

.hero h1 {
  margin: 0;
  font-size: clamp(2rem, 6vw, 3rem);
  letter-spacing: -0.02em;
}

.tagline {
  margin: 0.5rem 0 0;
  color: var(--muted);
  font-size: 1.05rem;
}

main {
  max-width: 720px;
  margin: 0 auto;
}

section { padding: 2.5rem 0; }

h2 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--muted);
  font-weight: 600;
  margin: 0 0 1rem;
}

h3 {
  font-size: 1.2rem;
  margin: 0 0 0.75rem;
}

p { margin: 0 0 1rem; }

.case {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 1.5rem;
}

.case p { margin-bottom: 0.9rem; }
.case p:last-child { margin-bottom: 0; }

.case strong { color: var(--accent); }

.skills {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.skills li {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.3rem 0.9rem;
  font-size: 0.9rem;
  color: var(--muted);
}

a { color: var(--accent); }

footer {
  max-width: 720px;
  margin: 0 auto;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
}