:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --surface: #ffffff;
  --text: #172033;
  --muted: #5f6b7a;
  --line: #dbe2ea;
  --accent: #3157d5;
  --active: #137a54;
  --archived: #6b7280;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Pretendard, "Noto Sans KR", system-ui, -apple-system, sans-serif;
  line-height: 1.65;
}

main {
  width: min(960px, calc(100% - 32px));
  margin: 0 auto;
  padding: 56px 0 80px;
}

h1, h2, h3 { line-height: 1.25; }
h1 { margin-bottom: 12px; font-size: clamp(2rem, 6vw, 3.5rem); }
h2 { margin-top: 48px; }
a { color: var(--accent); }
.lead { max-width: 720px; color: var(--muted); font-size: 1.08rem; }
.grid { display: grid; gap: 18px; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.card {
  display: block;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  color: inherit;
  text-decoration: none;
  box-shadow: 0 8px 24px rgba(23, 32, 51, 0.05);
}
.card:hover { border-color: var(--accent); transform: translateY(-1px); }
.session-card { display: flex; flex-direction: column; align-items: flex-start; }
.session-card > h3 { margin-bottom: 0; }
.artifact-links { display: flex; flex-wrap: wrap; gap: 10px; margin-top: auto; padding-top: 12px; }
.artifact-link {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 7px 13px;
  border: 1px solid var(--accent);
  border-radius: 8px;
  color: var(--accent);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
}
.artifact-link:hover { background: color-mix(in srgb, var(--accent) 8%, transparent); }
.artifact-link--primary { background: var(--accent); color: white; }
.artifact-link--primary:hover { background: color-mix(in srgb, var(--accent) 88%, black); }
.meta { color: var(--muted); font-size: 0.94rem; }
.badge {
  display: inline-block;
  margin-bottom: 12px;
  padding: 3px 10px;
  border-radius: 999px;
  color: white;
  font-size: 0.8rem;
  font-weight: 700;
}
.badge.active { background: var(--active); }
.badge.archived { background: var(--archived); }
.empty { padding: 20px; border: 1px dashed var(--line); border-radius: 12px; color: var(--muted); }
.back { display: inline-block; margin-bottom: 24px; }
footer { margin-top: 56px; color: var(--muted); font-size: 0.9rem; }