/* Shared stylesheet for Strategic Problem Solving lessons */
/* Tufte-inspired: clean, readable, beautiful print output */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root {
  --bg: #faf9f7;
  --text: #1a1a1a;
  --text-secondary: #6b6b6b;
  --accent: #2563eb;
  --accent-light: #dbeafe;
  --accent-warm: #d97706;
  --border: #e5e5e5;
  --code-bg: #f1f0ed;
  --callout-bg: #f5f3f0;
  --sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --serif: 'Instrument Serif', Georgia, serif;
  --mono: 'JetBrains Mono', 'Fira Code', monospace;
  --max-width: 680px;
  --radius: 8px;
}

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

body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  padding: 2rem 1.5rem;
  -webkit-font-smoothing: antialiased;
}

@media (min-width: 720px) {
  body { padding: 3rem 2rem; }
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
}

/* Typography */
h1, h2, h3 {
  font-family: var(--serif);
  font-weight: 400;
  letter-spacing: -0.01em;
}

h1 {
  font-size: 2.2rem;
  line-height: 1.2;
  margin-bottom: 0.5rem;
  color: var(--text);
}

h2 {
  font-size: 1.6rem;
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--border);
}

h3 {
  font-size: 1.2rem;
  margin-top: 1.75rem;
  margin-bottom: 0.5rem;
  font-family: var(--sans);
  font-weight: 600;
  letter-spacing: -0.01em;
}

p, li {
  margin-bottom: 0.75rem;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 2px;
}

a:hover { opacity: 0.8; }

/* Lesson header */
.lesson-meta {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.lesson-number {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--accent);
  color: white;
  padding: 0.2rem 0.7rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

/* Callout boxes */
.callout {
  background: var(--callout-bg);
  border-left: 4px solid var(--accent);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--radius) var(--radius) 0;
}

.callout.warm { border-left-color: var(--accent-warm); }
.callout.exercise { border-left-color: var(--accent); }

.callout-title {
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.4rem;
}

/* Code */
code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--code-bg);
  padding: 0.15em 0.35em;
  border-radius: 4px;
}

pre {
  background: var(--code-bg);
  padding: 1rem 1.25rem;
  border-radius: var(--radius);
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.85rem;
  line-height: 1.5;
  margin: 1.25rem 0;
}

/* Lists */
ul, ol {
  padding-left: 1.5rem;
}

li { margin-bottom: 0.4rem; }

/* Blockquote */
blockquote {
  border-left: 3px solid var(--border);
  padding-left: 1rem;
  margin: 1.25rem 0;
  color: var(--text-secondary);
  font-style: italic;
}

/* Tufte-style sidebar for extras */
.sidenote {
  font-size: 0.8rem;
  color: var(--text-secondary);
  padding: 0.75rem;
  margin: 0.75rem 0;
  background: var(--callout-bg);
  border-radius: var(--radius);
}

@media (min-width: 900px) {
  .sidenote {
    float: right;
    width: 240px;
    margin-right: -270px;
    font-size: 0.75rem;
  }
}

/* Framework card */
.framework-card {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  margin: 1.25rem 0;
}

.framework-card h4 {
  font-size: 1rem;
  margin-bottom: 0.4rem;
  font-weight: 600;
}

/* Print */
@media print {
  body {
    background: white;
    font-size: 12pt;
  }
  .lesson-number { background: #333; }
  a { text-decoration: none; }
}

/* Exercise box */
.exercise-step {
  display: flex;
  gap: 0.75rem;
  margin: 0.75rem 0;
  align-items: flex-start;
}

.exercise-step .step-num {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  background: var(--accent);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 600;
}

/* Mission quote */
.mission-ref {
  font-size: 0.9rem;
  color: var(--text-secondary);
  border: 1px dashed var(--border);
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  margin: 1rem 0;
}