/* Design tokens. Keep this block identical to the one in src/App.css. */
:root {
  --bg-top: #f6f8fc;
  --bg-bottom: #eef1f8;
  --surface: #ffffff;
  --ink: #0f172a;
  --ink-soft: #475569;
  --hairline: #e2e8f0;
  --grid-line: #cbd5e1;
  --cage-border: #0f172a;
  --accent: #4338ca;
  --accent-ink: #ffffff;
  --accent-soft: #c7d2fe;
  --selected-ink: #0f172a;
  --cage-fill: #f1f5f9;
  --constraint-ink: #334155;
  --success-ink: #166534;
  --success-bg: #dcfce7;
  --failure-ink: #991b1b;
  --failure-bg: #fee2e2;
  --neutral-ink: #334155;
  --neutral-bg: #e2e8f0;
  --shadow-card: 0 1px 2px rgba(15, 23, 42, 0.06), 0 8px 24px rgba(15, 23, 42, 0.06);
  --radius-card: 14px;
  --radius-control: 12px;
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg-top: #0b1120;
    --bg-bottom: #0b1120;
    --surface: #111827;
    --ink: #e5e7eb;
    --ink-soft: #94a3b8;
    --hairline: #1f2937;
    --grid-line: #334155;
    --cage-border: #e5e7eb;
    --accent: #a5b4fc;
    --accent-ink: #0f172a;
    --accent-soft: #3730a3;
    --selected-ink: #e5e7eb;
    --cage-fill: #1e293b;
    --constraint-ink: #cbd5e1;
    --success-ink: #86efac;
    --success-bg: #14532d;
    --failure-ink: #fca5a5;
    --failure-bg: #7f1d1d;
    --neutral-ink: #cbd5e1;
    --neutral-bg: #334155;
    --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.35);
  }
}

html {
  min-height: 100%;
  background-color: var(--bg-bottom);
}

body {
  min-height: 100%;
  margin: 0;
  font-family: var(--font-sans);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background: linear-gradient(to bottom, var(--bg-top), var(--bg-bottom));
  background-repeat: no-repeat;
  background-attachment: fixed;
}

/* About page */
.Container {
  box-sizing: border-box;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 32px 16px;
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--ink);
}

.InnerContainer {
  box-sizing: border-box;
  width: 100%;
  max-width: calc(65ch + 64px);
  padding: 32px;
  text-align: left;
  background-color: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
}

.InnerContainer > .Title {
  margin: 0 0 16px;
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.InnerContainer p {
  margin: 0 0 16px;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  border-radius: 4px;
}

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

a:hover {
  text-decoration-thickness: 2px;
}

a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.notices {
  margin-top: 24px;
  padding-top: 8px;
  border-top: 1px solid var(--hairline);
  font-size: 0.875rem;
  line-height: 1.6;
  color: var(--ink-soft);
}

.notices h2 {
  margin: 16px 0 4px;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink);
}

.notices ul {
  margin: 0;
  padding-left: 20px;
}

.notices li {
  margin: 4px 0;
}

@media (max-width: 480px) {
  .InnerContainer {
    padding: 24px 20px;
  }
}