:root {
  color-scheme: light only;
  --ink: #1f2937;
  --muted: #4b5563;
  --accent: #ea580c;
  --bg: #fffbeb;
  --card: #ffffff;
  --line: #fed7aa;
}

body[data-accent='topik'] {
  --accent: #2563eb;
  --bg: #eff6ff;
  --line: #bfdbfe;
}

body[data-accent='tutoring'] {
  --accent: #059669;
  --bg: #ecfdf5;
  --line: #a7f3d0;
}

body[data-accent='dictation'] {
  --accent: #0284c7;
  --bg: #f0f9ff;
  --line: #bae6fd;
}

body[data-accent='pet'] {
  --accent: #d97706;
  --bg: #fffbeb;
  --line: #fde68a;
}

body[data-accent='games'] {
  --accent: #4f46e5;
  --bg: #eef2ff;
  --line: #c7d2fe;
}

body[data-accent='wordchain'] {
  --accent: #7c3aed;
  --bg: #f5f3ff;
  --line: #ddd6fe;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, 'Segoe UI', sans-serif;
  color: var(--ink);
  background: linear-gradient(180deg, var(--bg) 0%, #fff 42%);
  line-height: 1.6;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

h1 {
  font-size: clamp(1.55rem, 4vw, 2rem);
  line-height: 1.25;
  margin: 0 0 0.75rem;
  color: var(--accent);
}

.lead {
  font-size: 1.05rem;
  color: var(--muted);
  margin: 0 0 1.5rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 1.25rem 1.35rem;
  margin-bottom: 1rem;
}

h2 {
  font-size: 1.1rem;
  margin: 0 0 0.65rem;
}

ul {
  margin: 0;
  padding-left: 1.2rem;
}

li {
  margin-bottom: 0.45rem;
}

a {
  color: var(--accent);
  font-weight: 600;
}

.cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.25rem;
}

.btn {
  display: inline-block;
  padding: 0.65rem 1.1rem;
  border-radius: 0.75rem;
  text-decoration: none;
  font-weight: 700;
  border: 2px solid var(--accent);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-secondary {
  background: #fff;
  color: var(--accent);
}

.ko {
  color: var(--muted);
  font-size: 0.95rem;
}

.site-footer {
  margin-top: 2rem;
  font-size: 0.85rem;
  color: var(--muted);
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.75rem;
  margin-top: 0.75rem;
}

.site-footer a {
  font-weight: 600;
}