/* === Shared Stylesheet for Label-Triggered GitHub Actions Course === */
/* Tufte-inspired: clean typography, generous whitespace, subtle hierarchy */

:root {
  --bg: #fffff8;
  --text: #111;
  --muted: #666;
  --accent: #0969da;
  --code-bg: #f6f8fa;
  --border: #d0d7de;
  --highlight: #fff8c5;
  --success: #1a7f37;
  --danger: #cf222e;
  --warning: #9a6700;
}

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

body {
  font-family: "Iowan Old Style", "Palatino Linotype", "URW Palladio L", Palatino, Georgia, serif;
  font-size: 18px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

h1 { font-size: 2.2rem; margin: 2rem 0 0.5rem; font-weight: 700; letter-spacing: -0.02em; }
h2 { font-size: 1.5rem; margin: 2rem 0 0.5rem; font-weight: 600; }
h3 { font-size: 1.15rem; margin: 1.5rem 0 0.4rem; font-weight: 600; }

p { margin: 0.8rem 0; }

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

code {
  font-family: "SF Mono", "Fira Code", "Fira Mono", Menlo, Consolas, monospace;
  font-size: 0.88em;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 3px;
  padding: 0.1em 0.35em;
}

pre {
  font-family: "SF Mono", "Fira Code", "Fira Mono", Menlo, Consolas, monospace;
  font-size: 0.82em;
  line-height: 1.5;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem 1.2rem;
  overflow-x: auto;
  margin: 1rem 0;
}

pre code {
  background: none;
  border: none;
  border-radius: 0;
  padding: 0;
  font-size: inherit;
}

blockquote {
  border-left: 3px solid var(--accent);
  margin: 1.2rem 0;
  padding: 0.4rem 1rem;
  color: var(--muted);
  font-style: italic;
}

ul, ol { padding-left: 1.6rem; margin: 0.6rem 0; }
li { margin: 0.25rem 0; }

table {
  border-collapse: collapse;
  width: 100%;
  margin: 1.2rem 0;
  font-size: 0.95em;
}

th, td {
  border: 1px solid var(--border);
  padding: 0.5rem 0.75rem;
  text-align: left;
}

th { background: var(--code-bg); font-weight: 600; }

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2rem 0;
}

/* === Components === */

.callout {
  border-left: 4px solid var(--accent);
  background: #f0f7ff;
  padding: 0.8rem 1rem;
  margin: 1.2rem 0;
  border-radius: 0 4px 4px 0;
  font-size: 0.95em;
}

.callout.warning {
  border-left-color: var(--warning);
  background: #fff8c5;
}

.callout.danger {
  border-left-color: var(--danger);
  background: #ffebe9;
}

.callout.success {
  border-left-color: var(--success);
  background: #dafbe1;
}

/* Label visualization */
.label {
  display: inline-block;
  padding: 0.15em 0.6em;
  border-radius: 2em;
  font-size: 0.78em;
  font-weight: 600;
  font-family: "SF Mono", "Fira Code", monospace;
  margin: 0 0.15em;
}

.label-green  { background: #dafbe1; color: #1a7f37; }
.label-yellow { background: #fff8c5; color: #9a6700; }
.label-red    { background: #ffebe9; color: #cf222e; }
.label-purple { background: #fbefff; color: #8250df; }

/* State machine diagram container */
.state-machine {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1.5rem;
  margin: 1.2rem 0;
  font-family: "SF Mono", "Fira Code", monospace;
  font-size: 0.85em;
  line-height: 1.7;
  white-space: pre;
  overflow-x: auto;
}

/* Quiz styles */
.quiz { margin: 1.5rem 0; }
.quiz-question { font-weight: 600; margin-bottom: 0.6rem; }
.quiz-option {
  display: block;
  padding: 0.5rem 0.8rem;
  margin: 0.3rem 0;
  border: 1px solid var(--border);
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.15s;
}
.quiz-option:hover { background: #f0f7ff; }
.quiz-option.selected { background: var(--highlight); border-color: #d4a72c; }
.quiz-option.correct { background: #dafbe1; border-color: var(--success); }
.quiz-option.incorrect { background: #ffebe9; border-color: var(--danger); }
.quiz-feedback { margin-top: 0.5rem; font-weight: 600; display: none; }
.quiz-feedback.show { display: block; }

/* Step counter */
.step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px; height: 28px;
  background: var(--accent);
  color: white;
  border-radius: 50%;
  font-size: 0.85em;
  font-weight: 700;
  margin-right: 0.4em;
  flex-shrink: 0;
}

/* Lesson nav */
.lesson-nav {
  display: flex;
  justify-content: space-between;
  margin: 2.5rem 0 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.9em;
}

/* Print styles */
@media print {
  body { font-size: 12pt; max-width: none; padding: 0; }
  pre, .state-machine { page-break-inside: avoid; }
  a { color: var(--text); }
}