:root,
html[data-theme="day"] {
  --ink: #1a2332;
  --muted: #5c6b7a;
  --line: #d7dee7;
  --panel: #f4f7fa;
  --panel-elev: #ffffff;
  --paper: #ffffff; /* canvas always white */
  --accent: #0b6e4f;
  --accent-soft: #e6f4ef;
  --danger: #b42318;
  --workspace: #8fa0b0;
  --toolbar: #f7fafc;
  --shadow: 0 10px 30px rgba(26, 35, 50, 0.18);
  --font-ui: "Segoe UI", "Candara", "Calibri", sans-serif;
  --font-display: "Palatino Linotype", "Book Antiqua", Georgia, serif;
  --a4-w: 210mm;
  --a4-h: 297mm;
  --body-bg:
    radial-gradient(1200px 600px at 10% -10%, #dfeaf3 0%, transparent 55%),
    radial-gradient(900px 500px at 100% 0%, #d8efe6 0%, transparent 45%),
    linear-gradient(180deg, #eef3f7 0%, #e3e9ef 100%);
}

html[data-theme="night"] {
  --ink: #e8eef5;
  --muted: #9aabbc;
  --line: #334155;
  --panel: #1b2431;
  --panel-elev: #243041;
  --paper: #ffffff; /* canvas always white — do not darken */
  --accent: #3ecf9a;
  --accent-soft: #163528;
  --danger: #f07167;
  --workspace: #0f1720;
  --toolbar: #151c27;
  --shadow: 0 12px 36px rgba(0, 0, 0, 0.45);
  --body-bg:
    radial-gradient(900px 500px at 8% -10%, #1e3a3a 0%, transparent 50%),
    radial-gradient(800px 480px at 100% 0%, #243044 0%, transparent 48%),
    linear-gradient(180deg, #121820 0%, #0d1218 100%);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; min-height: 100%; }
body {
  font-family: var(--font-ui);
  color: var(--ink);
  background: var(--body-bg);
  transition: background .25s ease, color .2s ease;
}

.home-shell { max-width: 1100px; margin: 0 auto; padding: 3rem 1.25rem 4rem; }
.home-hero { margin-bottom: 2.5rem; }
.home-brand {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 7vw, 4.5rem);
  letter-spacing: 0.04em;
  line-height: 0.95;
  color: var(--ink);
}
.home-hero h1 {
  margin: 0.4rem 0 0.75rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.4rem, 3vw, 2rem);
}
.home-lead, .home-sub { color: var(--muted); line-height: 1.5; }
.home-main h2 { margin: 0 0 0.35rem; font-size: 1.1rem; }
.scenario-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.75rem;
  margin-top: 1.25rem;
}
.scenario-card {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 1rem 1.1rem;
  text-decoration: none;
  color: inherit;
  background: rgba(255,255,255,0.72);
  border: 1px solid var(--line);
  transition: transform .15s ease, border-color .15s ease, background .15s ease;
}
.scenario-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent);
  background: #fff;
}
.scenario-name { font-weight: 650; }
.scenario-meta { font-size: 0.78rem; color: var(--muted); }