:root {
  --color-primary: #201d1d;
  --color-on-primary: #fdfcfc;
  --color-ink: #201d1d;
  --color-ink-deep: #0f0000;
  --color-charcoal: #302c2c;
  --color-body: #424245;
  --color-mute: #646262;
  --color-stone: #6e6e73;
  --color-ash: #9a9898;
  --color-canvas: #fdfcfc;
  --color-surface-soft: #f8f7f7;
  --color-surface-card: #f1eeee;
  --color-surface-dark: #201d1d;
  --color-surface-dark-elevated: #302c2c;
  --color-hairline: rgba(15,0,0,0.12);
  --color-hairline-strong: #646262;
  --color-on-dark: #fdfcfc;
  --color-on-dark-mute: #9a9898;
  --color-accent: #007aff;
  --color-success: #30d158;

  --rounded-none: 0px;
  --rounded-sm: 4px;
  --rounded-full: 9999px;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 12px;
  --space-lg: 16px;
  --space-xl: 24px;
  --space-xxl: 32px;
  --space-section: 96px;

  --font-mono: "Berkeley Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", system-ui, "Segoe UI", "PingFang SC", "Microsoft YaHei", monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: var(--font-mono);
  color: var(--color-ink);
  background: var(--color-canvas);
  font-size: 16px;
  line-height: 1.5;
}
a { color: var(--color-ink); text-decoration: underline; }

.wrap { max-width: 960px; margin: 0 auto; padding: 0 24px; }

.header {
  background: var(--color-canvas);
  border-bottom: 1px solid var(--color-hairline);
}
.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 56px;
}
.logo {
  font-weight: 700;
  color: var(--color-ink);
  font-size: 14px;
  text-decoration: none;
  white-space: pre;
  line-height: 1.1;
  letter-spacing: 0;
}
.logo:hover { text-decoration: none; }
.nav { display: flex; flex-wrap: wrap; gap: 4px 16px; flex: 1; }
.nav a { color: var(--color-ink); text-decoration: none; font-weight: 500; font-size: 16px; }
.nav a.on { text-decoration: underline; }
.back { margin-left: auto; font-size: 14px; color: var(--color-mute); text-decoration: none; }

.ascii {
  font-size: 10px;
  line-height: 1.05;
  font-weight: 700;
  white-space: pre;
  letter-spacing: 0;
}

.hero {
  padding: 48px 0 0;
}
.hero h1 {
  font-size: 38px;
  font-weight: 700;
  line-height: 1.5;
  margin: 0 0 16px;
}
.hero p { margin: 0 0 16px; color: var(--color-body); max-width: 46em; }
.badge {
  display: inline-block;
  background: var(--color-surface-dark);
  color: var(--color-on-dark);
  font-size: 14px;
  padding: 2px 8px;
  border-radius: 4px;
  margin-bottom: 16px;
}

.tui {
  background: var(--color-surface-dark);
  color: var(--color-on-dark);
  padding: 64px 32px;
  margin-top: 32px;
}
.tui .ascii { color: var(--color-on-dark); text-align: center; font-size: 11px; }
.tui-prompt {
  background: var(--color-surface-dark-elevated);
  color: #fff;
  padding: 8px 12px;
  border-radius: 4px;
  margin: 24px auto 0;
  max-width: 640px;
}
.tui-hint {
  color: var(--color-ash);
  font-size: 14px;
  margin-top: 16px;
  text-align: center;
}

.section {
  padding: 96px 0 0;
  border-top: 1px solid var(--color-hairline);
  margin-top: 96px;
}
.section:first-of-type { border-top: 0; margin-top: 0; }
.section h2 {
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 16px;
}
.muted { color: var(--color-body); }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }

.card {
  background: transparent;
  border: 1px solid var(--color-hairline);
  border-radius: 0;
  padding: 16px;
}
.card h3 { margin: 0 0 8px; font-size: 16px; font-weight: 700; }
.card p { margin: 0; color: var(--color-body); font-size: 16px; }

.rows { list-style: none; margin: 0; padding: 0; }
.rows li {
  padding: 8px 0;
  color: var(--color-body);
}
.rows .mark { color: var(--color-ink); font-weight: 700; margin-right: 8px; }

.list { list-style: none; margin: 0; padding: 0; }
.list li {
  border-bottom: 1px solid var(--color-hairline);
  padding: 12px 0;
}
.list .date { color: var(--color-mute); margin-right: 12px; }

.ph {
  background: var(--color-surface-card);
  color: var(--color-ash);
  height: 120px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  margin-bottom: 12px;
}

.snippet {
  background: var(--color-surface-card);
  padding: 12px 16px;
  border-radius: 4px;
  margin: 12px 0;
}
.tabs { display: flex; gap: 0; border-bottom: 1px solid var(--color-hairline-strong); margin-bottom: 12px; }
.tabs span {
  padding: 8px 16px;
  color: var(--color-mute);
  font-weight: 500;
}
.tabs span.on {
  color: var(--color-ink);
  box-shadow: inset 0 -2px 0 var(--color-ash);
}

.btn, button, .btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--color-primary);
  color: var(--color-on-primary);
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 500;
  line-height: 2;
  padding: 4px 20px;
  height: 36px;
  border: 0;
  border-radius: 4px;
  cursor: pointer;
  text-decoration: none;
}
.btn:hover, .btn-primary:hover { text-decoration: none; color: var(--color-on-primary); background: var(--color-ink-deep); }
.btn-secondary {
  background: var(--color-canvas);
  color: var(--color-ink);
  border: 1px solid var(--color-hairline-strong);
}
.btn-secondary:hover { color: var(--color-ink); }

form label { display: block; margin: 0 0 4px; font-weight: 500; }
form input, form textarea {
  width: 100%;
  max-width: 480px;
  padding: 8px 12px;
  border: 1px solid var(--color-hairline);
  border-radius: 4px;
  font: inherit;
  margin-bottom: 12px;
  background: var(--color-surface-soft);
  min-height: 40px;
  color: var(--color-ink);
}
form textarea { min-height: 88px; }
form input:focus, form textarea:focus {
  outline: none;
  background: var(--color-canvas);
  border-color: var(--color-ink);
}

.footer {
  border-top: 1px solid var(--color-hairline);
  padding: 32px 0 48px;
  color: var(--color-body);
  font-size: 14px;
  margin-top: 96px;
}
.footer a { color: var(--color-mute); margin-right: 16px; text-decoration: none; }

@media (max-width: 800px) {
  .grid, .grid-2 { grid-template-columns: 1fr; }
  .hero h1 { font-size: 28px; }
  .nav { display: none; }
  .section { padding-top: 48px; margin-top: 48px; }
}

.ph { overflow: hidden; }
.ph img { width: 100%; height: 100%; object-fit: cover; display: block; }