/* ============================================================
   learn-durable-objects — shared stylesheet
   Tufte-inspired: generous margins, readable type, no clutter
   ============================================================ */

:root {
  --text:        #1a1a1a;
  --muted:       #555;
  --border:      #ddd;
  --bg:          #fffef9;
  --code-bg:     #f5f4ef;
  --accent:      #f6821f;   /* Cloudflare orange */
  --accent-dark: #c96a10;
  --success:     #2d6a2d;
  --success-bg:  #edf7ed;
  --error:       #8b0000;
  --error-bg:    #fdf0f0;
  --accent-bg:   #fff8ed;
  --surface:     #fff;
  --surface-alt: #f0efe9;
  --max-width:   680px;
  --font-serif:  Georgia, 'Times New Roman', serif;
  --font-mono:   'SF Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text:        #e8e6de;
    --muted:       #a3a094;
    --border:      #3a3a36;
    --bg:          #17171a;
    --code-bg:     #212124;
    --accent:      #f6821f;
    --accent-dark: #ff9d40;
    --success:     #7fc97f;
    --success-bg:  #1e2c1e;
    --error:       #e07a7a;
    --error-bg:    #2c1e1e;
    --accent-bg:   #2c2411;
    --surface:     #202023;
    --surface-alt: #232326;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html {
  font-size: 18px;
  background: var(--bg);
  color: var(--text);
  color-scheme: light dark;
}

body {
  font-family: var(--font-serif);
  line-height: 1.65;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem 6rem;
}

/* ── Typography ── */

h1 {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 0.25rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.15rem;
  font-weight: 700;
  margin: 2.5rem 0 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

p { margin: 0 0 1rem; }

a { color: var(--accent-dark); }
a:hover { color: var(--accent); }

strong { font-weight: 700; }
em { font-style: italic; }

/* ── Code ── */

code {
  font-family: var(--font-mono);
  font-size: 0.82em;
  background: var(--code-bg);
  border-radius: 3px;
  padding: 0.1em 0.35em;
}

pre {
  background: var(--code-bg);
  border-left: 3px solid var(--accent);
  border-radius: 4px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  margin: 1.25rem 0;
}

pre code {
  background: none;
  padding: 0;
  font-size: 0.85rem;
  line-height: 1.5;
}

/* ── Lesson header ── */

.lesson-meta {
  font-family: sans-serif;
  font-size: 0.78rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.5rem;
}

.lesson-meta a {
  color: var(--muted);
  text-decoration: none;
}

.lesson-meta a:hover { color: var(--accent); }

/* ── Callout / aside ── */

.callout {
  border-left: 3px solid var(--accent);
  background: var(--code-bg);
  padding: 0.75rem 1rem;
  margin: 1.5rem 0;
  font-size: 0.92rem;
}

.callout p:last-child { margin-bottom: 0; }

/* ── Primary source citation ── */

.primary-source {
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 0.75rem 1rem;
  margin: 2rem 0;
  font-size: 0.88rem;
  font-family: sans-serif;
}

.primary-source .label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted);
  display: block;
  margin-bottom: 0.25rem;
}

/* ── Ask your teacher prompt ── */

.ask-teacher {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-family: sans-serif;
  font-size: 0.85rem;
  color: var(--muted);
}

/* ── Navigation between lessons ── */

.lesson-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 3rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-family: sans-serif;
  font-size: 0.85rem;
}

.lesson-nav a { text-decoration: none; color: var(--accent-dark); }
.lesson-nav a:hover { color: var(--accent); }

/* ── Podcast player ── */

.podcast {
  margin: 2rem 0;
  padding: 1rem;
  background: var(--code-bg);
  border-radius: 4px;
  font-family: sans-serif;
  font-size: 0.85rem;
}

.podcast p { margin: 0 0 0.5rem; font-size: 0.8rem; color: var(--muted); }

audio { width: 100%; display: block; }