/* Tufte-inspired stylesheet for SR learning materials */

:root {
  --bg: #fffff8;
  --text: #111;
  --text-secondary: #555;
  --accent: #b58900;
  --accent-light: #f0e6cc;
  --border: #ddd;
  --code-bg: #f5f5f5;
  --margin: 55px;
  --font-serif: "ETBook", "Palatino Linotype", "Book Antiqua", Palatino, serif;
  --font-sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "Consolas", "Monaco", monospace;
}

@media print {
  :root {
    --bg: #fff;
  }
  body {
    max-width: 100%;
  }
}

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

body {
  font-family: var(--font-serif);
  font-size: 15px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  max-width: 1400px;
  margin: 0 auto;
  padding: 40px var(--margin);
}

/* Typography */
h1 {
  font-size: 2.4em;
  font-weight: 400;
  margin-bottom: 0.3em;
  line-height: 1.2;
  color: var(--text);
}

h2 {
  font-size: 1.6em;
  font-weight: 400;
  margin-top: 1.5em;
  margin-bottom: 0.5em;
  color: var(--text);
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.2em;
}

h3 {
  font-size: 1.2em;
  font-weight: 600;
  margin-top: 1.2em;
  margin-bottom: 0.4em;
  color: var(--text);
}

h4 {
  font-size: 1em;
  font-weight: 600;
  margin-top: 1em;
  margin-bottom: 0.3em;
}

p {
  margin-bottom: 1em;
  text-align: justify;
  hyphens: auto;
}

/* Links */
a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Lists */
ul, ol {
  margin-left: 1.5em;
  margin-bottom: 1em;
}

li {
  margin-bottom: 0.3em;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font-size: 0.9em;
  font-family: var(--font-sans);
}

th {
  border-bottom: 2px solid var(--text);
  padding: 8px 12px;
  text-align: left;
  font-weight: 600;
}

td {
  border-bottom: 1px solid var(--border);
  padding: 8px 12px;
  vertical-align: top;
}

tr:hover td {
  background: var(--accent-light);
}

/* Code */
code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  background: var(--code-bg);
  padding: 2px 5px;
  border-radius: 3px;
}

pre {
  background: var(--code-bg);
  padding: 15px;
  border-radius: 5px;
  overflow-x: auto;
  margin: 1em 0;
  font-size: 0.85em;
  line-height: 1.4;
}

pre code {
  background: none;
  padding: 0;
}

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

/* Sidenotes / Margin notes */
.sidenote {
  float: right;
  clear: right;
  margin-right: -60%;
  width: 50%;
  font-size: 0.85em;
  line-height: 1.4;
  color: var(--text-secondary);
  vertical-align: baseline;
  position: relative;
}

/* Cards */
.card {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 20px;
  margin: 1.5em 0;
  background: #fff;
}

.card-header {
  font-weight: 600;
  margin-bottom: 0.5em;
  color: var(--accent);
}

/* Quiz */
.quiz {
  border: 2px solid var(--accent);
  border-radius: 8px;
  padding: 20px;
  margin: 1.5em 0;
  background: var(--accent-light);
}

.quiz-question {
  font-weight: 600;
  margin-bottom: 1em;
}

.quiz-option {
  display: block;
  padding: 10px 15px;
  margin: 8px 0;
  border: 1px solid var(--border);
  border-radius: 5px;
  cursor: pointer;
  background: #fff;
  transition: background 0.2s;
}

.quiz-option:hover {
  background: var(--accent-light);
}

.quiz-option.correct {
  background: #d4edda;
  border-color: #28a745;
}

.quiz-option.wrong {
  background: #f8d7da;
  border-color: #dc3545;
}

.quiz-option.disabled {
  cursor: default;
}

.quiz-feedback {
  margin-top: 1em;
  padding: 12px 15px;
  border-radius: 5px;
  font-size: 0.9em;
  background: #fff;
  border: 1px solid var(--border);
}

.quiz-feedback .feedback-verdict {
  font-weight: 600;
}

.quiz-feedback.feedback-correct .feedback-verdict {
  color: #28a745;
}

.quiz-feedback.feedback-wrong .feedback-verdict {
  color: #dc3545;
}

/* Calculation exercise */
.calc-ex {
  border: 2px solid var(--accent);
  border-radius: 8px;
  padding: 20px;
  margin: 1.5em 0;
  background: var(--accent-light);
}

.calc-prompt {
  font-weight: 600;
  margin-bottom: 1em;
}

.calc-row {
  display: flex;
  gap: 10px;
  align-items: center;
}

.calc-input {
  font-family: var(--font-mono);
  font-size: 1em;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 5px;
  width: 140px;
  background: #fff;
}

.calc-input.correct {
  border-color: #28a745;
  background: #d4edda;
}

.calc-input.wrong {
  border-color: #dc3545;
  background: #f8d7da;
}

.calc-check {
  font-family: var(--font-sans);
  font-size: 0.9em;
  padding: 8px 18px;
  border: 1px solid var(--accent);
  border-radius: 5px;
  background: #fff;
  color: var(--accent);
  cursor: pointer;
}

.calc-check:hover:not(:disabled) {
  background: var(--accent-light);
}

.calc-check:disabled {
  opacity: 0.5;
  cursor: default;
}

.calc-feedback {
  margin-top: 1em;
  padding: 12px 15px;
  border-radius: 5px;
  font-size: 0.9em;
  background: #fff;
  border: 1px solid var(--border);
}

.calc-feedback .feedback-verdict {
  font-weight: 600;
}

.calc-feedback.feedback-correct .feedback-verdict {
  color: #28a745;
}

.calc-feedback.feedback-wrong .feedback-verdict {
  color: #dc3545;
}

/* Callouts */
.callout {
  border-left: 4px solid var(--accent);
  padding: 15px 20px;
  margin: 1em 0;
  background: var(--accent-light);
}

.callout-title {
  font-weight: 600;
  margin-bottom: 0.5em;
}

/* Navigation */
.nav {
  margin-top: 2em;
  padding-top: 1em;
  border-top: 1px solid var(--border);
  font-size: 0.9em;
  color: var(--text-secondary);
}

/* Print optimization */
@media print {
  .sidenote {
    display: none;
  }
  
  body {
    padding: 20px;
  }
}

/* Responsive */
@media (max-width: 1200px) {
  .sidenote {
    float: none;
    margin: 1em 0;
    width: 100%;
    display: block;
  }
}

@media (max-width: 768px) {
  body {
    padding: 20px;
  }
  
  h1 {
    font-size: 1.8em;
  }
  
  h2 {
    font-size: 1.3em;
  }
}