/* Shared stylesheet for Cloudflare Developer Platform lessons. Tufte-inspired: quiet, readable, generous whitespace. */

:root {
  --ink: #1a1a1a;
  --paper: #fdfcfa;
  --muted: #6b6b6b;
  --rule: #ddd8d0;
  --accent: #f6821f; /* Cloudflare orange, used sparingly */
  --accent-dark: #c25f0a;
  --code-bg: #f4f2ee;
  --note-bg: #fff8ec;
  --good-bg: #eef7ee;
  --warn-bg: #fdecec;
  --serif: Georgia, "Iowan Old Style", "Palatino Linotype", Palatino, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  --mono: "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --measure: 42em;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--serif);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  font-size: 19px;
  margin: 0;
  padding: 3rem 1.5rem 6rem;
}

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

/* Header / kicker */

.kicker {
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-dark);
  font-weight: 600;
  margin-bottom: 0.5rem;
}

h1 {
  font-size: 2.1rem;
  line-height: 1.2;
  margin: 0 0 0.3rem;
}

.subtitle {
  font-family: var(--sans);
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0 0 2rem;
}

h2 {
  font-size: 1.4rem;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.3rem;
  border-bottom: 1px solid var(--rule);
}

h3 {
  font-family: var(--sans);
  font-size: 1.05rem;
  margin: 1.8rem 0 0.6rem;
  color: var(--accent-dark);
}

p { margin: 0 0 1.1rem; }

a { color: var(--accent-dark); text-decoration-thickness: from-font; }
a:hover { color: var(--accent); }

ul, ol { margin: 0 0 1.1rem; padding-left: 1.4rem; }
li { margin-bottom: 0.4rem; }

strong { font-weight: 700; }

/* Code */

code {
  font-family: var(--mono);
  font-size: 0.85em;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

pre {
  background: var(--code-bg);
  padding: 1rem 1.2rem;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.85rem;
  line-height: 1.5;
  margin: 0 0 1.3rem;
  border-left: 3px solid var(--accent);
}

pre code {
  background: none;
  padding: 0;
  font-size: 1em;
}

/* Callout boxes */

.box {
  font-family: var(--sans);
  font-size: 0.92rem;
  padding: 1rem 1.2rem;
  border-radius: 6px;
  margin: 0 0 1.3rem;
}

.box-note { background: var(--note-bg); border-left: 3px solid var(--accent); }
.box-good { background: var(--good-bg); border-left: 3px solid #4a9d5f; }
.box-warn { background: var(--warn-bg); border-left: 3px solid #c0392b; }

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

/* Pricing tables */

table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--sans);
  font-size: 0.88rem;
  margin: 0 0 1.3rem;
}

th, td {
  text-align: left;
  padding: 0.55rem 0.8rem;
  border-bottom: 1px solid var(--rule);
}

th {
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  font-size: 0.72rem;
  letter-spacing: 0.05em;
}

/* Quiz widget */

.quiz {
  font-family: var(--sans);
  background: var(--code-bg);
  border-radius: 8px;
  padding: 1.3rem 1.3rem 1.5rem;
  margin: 1.5rem 0;
}

.quiz-q {
  font-weight: 600;
  margin-bottom: 0.8rem;
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 0.8rem;
}

.quiz-option {
  text-align: left;
  font-family: var(--sans);
  font-size: 0.92rem;
  background: var(--paper);
  border: 1px solid var(--rule);
  border-radius: 5px;
  padding: 0.6rem 0.9rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
}

.quiz-option:hover { border-color: var(--accent); }

.quiz-option.correct { background: var(--good-bg); border-color: #4a9d5f; }
.quiz-option.incorrect { background: var(--warn-bg); border-color: #c0392b; }
.quiz-option:disabled { cursor: default; }

.quiz-feedback {
  font-size: 0.88rem;
  min-height: 1.2em;
  margin-top: 0.4rem;
}

.quiz-feedback.correct { color: #2e7d43; }
.quiz-feedback.incorrect { color: #a72a2a; }

/* Reveal / recall widget */

.recall {
  font-family: var(--sans);
  background: var(--code-bg);
  border-radius: 8px;
  padding: 1.3rem;
  margin: 1.5rem 0;
}

.recall-prompt { font-weight: 600; margin-bottom: 0.8rem; }

.recall summary {
  cursor: pointer;
  color: var(--accent-dark);
  font-size: 0.9rem;
  font-weight: 600;
}

.recall-answer {
  margin-top: 0.8rem;
  padding-top: 0.8rem;
  border-top: 1px dashed var(--rule);
  font-family: var(--serif);
  font-size: 1rem;
}

/* Footer nav */

.lesson-nav {
  font-family: var(--sans);
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
  font-size: 0.9rem;
}

.lesson-nav a { text-decoration: none; }
.lesson-nav a:hover { text-decoration: underline; }

.ask-teacher {
  font-family: var(--sans);
  font-size: 0.88rem;
  color: var(--muted);
  background: none;
  border: 1px dashed var(--rule);
  border-radius: 6px;
  padding: 0.9rem 1.1rem;
  margin: 2rem 0;
}

.primary-source {
  font-family: var(--sans);
  font-size: 0.92rem;
  background: var(--note-bg);
  border-radius: 6px;
  padding: 1rem 1.2rem;
  margin: 1.5rem 0;
}

.primary-source .kicker { margin-bottom: 0.4rem; }

.badge {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.15em 0.6em;
  border-radius: 999px;
  background: var(--code-bg);
  color: var(--muted);
  margin-right: 0.4rem;
}

figure { margin: 0 0 1.3rem; }
figcaption {
  font-family: var(--sans);
  font-size: 0.82rem;
  color: var(--muted);
  margin-top: 0.4rem;
}

hr {
  border: none;
  border-top: 1px solid var(--rule);
  margin: 2.5rem 0;
}