/* German Learning — Shared Stylesheet */

:root {
  --ink: #1a1a1a;
  --ink-light: #555;
  --ink-faint: #888;
  --bg: #fafaf8;
  --bg-warm: #f4f1eb;
  --accent: #2e5d9e;
  --accent-dark: #1d3f6e;
  --green: #1e6b3c;
  --green-bg: #eaf5ee;
  --red: #8b1a1a;
  --red-bg: #fdecea;
  --yellow-bg: #fdf8e8;
  --border: #ddd;
  --radius: 6px;
  --max-w: 680px;
}

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

body {
  font-family: 'Georgia', 'Times New Roman', serif;
  font-size: 18px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--bg);
  padding: 3rem 1.5rem 6rem;
}

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

/* Typography */

h1 {
  font-size: 1.9rem;
  line-height: 1.25;
  margin-bottom: 0.3rem;
  color: var(--ink);
}

.subtitle {
  font-size: 1rem;
  color: var(--ink-light);
  margin-bottom: 2.5rem;
  font-style: italic;
}

h2 {
  font-size: 1.2rem;
  font-weight: bold;
  margin: 2.5rem 0 0.75rem;
  color: var(--ink);
  letter-spacing: 0.01em;
}

h3 {
  font-size: 1rem;
  font-weight: bold;
  margin: 1.5rem 0 0.5rem;
  color: var(--ink);
}

p { margin-bottom: 1rem; }

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

code, .de {
  font-family: 'Courier New', monospace;
  font-size: 0.92em;
  background: var(--bg-warm);
  padding: 0.1em 0.35em;
  border-radius: 3px;
  color: var(--accent-dark);
}

/* Rule box */

.rule-box {
  background: var(--yellow-bg);
  border-left: 4px solid #c9a800;
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  border-radius: 0 var(--radius) var(--radius) 0;
}

.rule-box .formula {
  font-family: 'Courier New', monospace;
  font-size: 1rem;
  color: var(--ink);
  margin-top: 0.5rem;
}

/* Example table */

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0;
  font-size: 0.95rem;
}

th {
  text-align: left;
  padding: 0.4rem 0.75rem;
  border-bottom: 2px solid var(--border);
  color: var(--ink-light);
  font-size: 0.85rem;
  font-style: normal;
  letter-spacing: 0.05em;
}

td {
  padding: 0.5rem 0.75rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

tr:last-child td { border-bottom: none; }

.wrong { color: var(--red); }
.right { color: var(--green); }

/* Quiz */

.quiz-section {
  margin: 2rem 0;
}

.question-block {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  margin-bottom: 1rem;
  transition: border-color 0.2s;
}

.question-block.correct { border-color: #5aab77; background: var(--green-bg); }
.question-block.incorrect { border-color: #c97070; background: var(--red-bg); }

.question-text {
  font-size: 1rem;
  margin-bottom: 0.9rem;
  line-height: 1.5;
}

.blank {
  display: inline-block;
  min-width: 120px;
  border-bottom: 2px solid var(--ink-light);
  margin: 0 0.2em;
  color: transparent;
  font-family: 'Courier New', monospace;
}

.options {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.option-btn {
  background: var(--bg-warm);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.55rem 1rem;
  text-align: left;
  font-family: 'Courier New', monospace;
  font-size: 0.95rem;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s;
  color: var(--ink);
}

.option-btn:hover:not(:disabled) {
  background: #e8e4da;
  border-color: #bbb;
}

.option-btn.selected-correct {
  background: var(--green-bg);
  border-color: #5aab77;
  color: var(--green);
  font-weight: bold;
}

.option-btn.selected-incorrect {
  background: var(--red-bg);
  border-color: #c97070;
  color: var(--red);
  text-decoration: line-through;
}

.option-btn.reveal-correct {
  background: var(--green-bg);
  border-color: #5aab77;
  color: var(--green);
}

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

.feedback {
  margin-top: 0.75rem;
  font-size: 0.9rem;
  line-height: 1.5;
  display: none;
}

.feedback.show { display: block; }
.feedback.correct-fb { color: var(--green); }
.feedback.incorrect-fb { color: var(--red); }

/* Score */

.score-bar {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.5rem;
  margin-top: 1.5rem;
  display: none;
  font-size: 1rem;
}

.score-bar.show { display: block; }
.score-number { font-size: 1.5rem; font-weight: bold; color: var(--accent); }

/* Nav footer */

.lesson-nav {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.88rem;
  color: var(--ink-faint);
}

.lesson-nav a { color: var(--ink-light); }

.ask-teacher {
  background: var(--bg-warm);
  border-radius: var(--radius);
  padding: 0.75rem 1rem;
  margin-top: 2rem;
  font-size: 0.92rem;
  color: var(--ink-light);
  border: 1px solid var(--border);
}

/* Print */

@media print {
  body { background: white; padding: 1rem; }
  .option-btn { border: 1px solid #aaa; }
  .quiz-section { display: none; }
}