/* Bloons TD Strategy Guide — dark by default, light auto */
:root {
  --bg: #0d1117;
  --bg-card: #161b22;
  --bg-card-hover: #1f2630;
  --border: #30363d;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --accent: #58a6ff;
  --accent-hover: #79b8ff;
  --primary-tower: #58a6ff;
  --military-tower: #f85149;
  --magic-tower: #a371f7;
  --support-tower: #3fb950;
  --warn: #d29922;
  --danger: #f85149;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f6f8fa;
    --bg-card: #ffffff;
    --bg-card-hover: #eef1f4;
    --border: #d0d7de;
    --text: #1f2328;
    --text-dim: #656d76;
    --accent: #0969da;
    --accent-hover: #0550ae;
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 16px;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hover); text-decoration: underline; }

/* Layout */
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }

/* Header */
.site-header {
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  padding: 20px 0;
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(8px);
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px; }
.brand { display: flex; align-items: center; gap: 12px; font-size: 22px; font-weight: 700; }
.brand .logo {
  width: 40px; height: 40px; border-radius: 8px;
  background: linear-gradient(135deg, var(--primary-tower), var(--magic-tower));
  display: flex; align-items: center; justify-content: center;
  font-size: 22px;
}
.brand a { color: var(--text); }
.brand a:hover { text-decoration: none; }
.tagline { color: var(--text-dim); font-size: 14px; }

/* Hero on landing */
.hero {
  padding: 60px 0 40px;
  text-align: center;
}
.hero h1 { font-size: 48px; line-height: 1.1; margin-bottom: 16px; }
.hero p { font-size: 18px; color: var(--text-dim); max-width: 700px; margin: 0 auto 24px; }
.hero .badges { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.badge {
  display: inline-block;
  padding: 6px 12px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  font-size: 13px;
  color: var(--text-dim);
}

/* Mode grid */
.modes-section { padding: 30px 0 60px; }
.section-title { font-size: 28px; margin-bottom: 24px; padding-bottom: 12px; border-bottom: 1px solid var(--border); }

.mode-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
}
.mode-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  transition: all 0.15s ease;
  display: flex; flex-direction: column;
}
.mode-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--accent);
  transform: translateY(-2px);
  text-decoration: none;
}
.mode-card .difficulty {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 4px;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  margin-bottom: 12px;
  align-self: flex-start;
}
.difficulty.easy { background: rgba(63, 185, 80, 0.15); color: var(--support-tower); }
.difficulty.medium { background: rgba(210, 153, 34, 0.15); color: var(--warn); }
.difficulty.hard { background: rgba(248, 81, 73, 0.15); color: var(--danger); }
.difficulty.expert { background: rgba(248, 81, 73, 0.25); color: var(--danger); border: 1px solid var(--danger); }

.mode-card h2 { font-size: 22px; margin-bottom: 8px; color: var(--text); }
.mode-card .desc { color: var(--text-dim); font-size: 14px; flex-grow: 1; margin-bottom: 12px; }
.mode-card .towers { font-size: 13px; color: var(--accent); }
.mode-card .towers strong { color: var(--text-dim); font-weight: 500; }

/* Guide page */
.guide-header {
  padding: 40px 0 20px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 30px;
}
.breadcrumb { font-size: 14px; color: var(--text-dim); margin-bottom: 12px; }
.breadcrumb a { color: var(--text-dim); }
.breadcrumb a:hover { color: var(--accent); }
.guide-header h1 { font-size: 42px; margin-bottom: 8px; }
.guide-header .subtitle { color: var(--text-dim); font-size: 18px; }

/* Info card */
.info-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 20px;
  margin-bottom: 24px;
}
.info-card h3 { font-size: 16px; text-transform: uppercase; letter-spacing: 0.5px; color: var(--text-dim); margin-bottom: 12px; font-weight: 600; }
.info-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; }
.info-item .label { font-size: 12px; color: var(--text-dim); text-transform: uppercase; margin-bottom: 4px; }
.info-item .value { font-size: 16px; font-weight: 500; }

/* Tower list */
.tower-list { display: flex; flex-wrap: wrap; gap: 8px; }
.tower-chip {
  display: inline-block;
  padding: 4px 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
}
.tower-chip.cat-primary { border-color: var(--primary-tower); }
.tower-chip.cat-military { border-color: var(--military-tower); }
.tower-chip.cat-magic { border-color: var(--magic-tower); }
.tower-chip.cat-support { border-color: var(--support-tower); }

/* Section blocks */
.guide-section { margin-bottom: 32px; }
.guide-section h2 { font-size: 26px; margin-bottom: 16px; padding-bottom: 8px; border-bottom: 1px solid var(--border); }
.guide-section h3 { font-size: 20px; margin-top: 18px; margin-bottom: 10px; }
.guide-section p { margin-bottom: 12px; }
.guide-section ul, .guide-section ol { margin-left: 24px; margin-bottom: 12px; }
.guide-section li { margin-bottom: 6px; }

/* Step blocks */
.step {
  background: var(--bg-card);
  border-left: 4px solid var(--accent);
  padding: 16px 20px;
  margin-bottom: 14px;
  border-radius: 0 8px 8px 0;
}
.step .round {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}
.step .round.start { color: var(--support-tower); }
.step .round.mid { color: var(--warn); }
.step .round.late { color: var(--danger); }
.step strong { color: var(--text); }
.step p:last-child { margin-bottom: 0; }

/* Upgrade notation */
.upg {
  font-family: "SF Mono", Monaco, Menlo, Consolas, monospace;
  background: var(--bg);
  padding: 1px 6px;
  border-radius: 4px;
  border: 1px solid var(--border);
  font-size: 13px;
  color: var(--accent);
}

/* Tip/warn boxes */
.callout {
  border-radius: 8px;
  padding: 14px 18px;
  margin: 14px 0;
  border-left: 4px solid;
}
.callout.tip { background: rgba(63, 185, 80, 0.08); border-color: var(--support-tower); }
.callout.warn { background: rgba(210, 153, 34, 0.08); border-color: var(--warn); }
.callout.danger { background: rgba(248, 81, 73, 0.08); border-color: var(--danger); }
.callout strong { display: block; margin-bottom: 4px; }
.callout p:last-child { margin-bottom: 0; }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 30px 0;
  margin-top: 60px;
  color: var(--text-dim);
  font-size: 14px;
  text-align: center;
}

/* Two-col layout for guide pages */
.guide-layout { display: grid; grid-template-columns: 1fr; gap: 30px; }
@media (min-width: 900px) {
  .guide-layout { grid-template-columns: 1fr 280px; }
}
.guide-sidebar { position: sticky; top: 100px; align-self: start; }
.guide-sidebar h4 { font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; color: var(--text-dim); margin-bottom: 8px; }
.guide-sidebar ul { list-style: none; margin: 0; }
.guide-sidebar li { margin-bottom: 6px; }
.guide-sidebar a { font-size: 14px; }
</content>
</invoke>