/* book.css — Κοινές στυλ για Book1 (Μαθηματικά Ι) */
:root {
  --aspblue:    #004080;
  --aspgold:    #b48c00;
  --bookblue:   #0082b4;
  --bookorange: #be5000;
  --bookgreen:  #008c46;
  --quizcolor:  #c85000;
  --extracolor: #003c82;
  --textcolor:  #1a1a1a;
  --bg:         #fafafa;
  --card-bg:    #ffffff;
  --radius:     10px;
  --shadow:     0 2px 12px rgba(0,0,0,0.10);
}

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

body {
  font-family: 'Georgia', 'Times New Roman', serif;
  background: var(--bg);
  color: var(--textcolor);
  line-height: 1.7;
  font-size: 17px;
}

/* ── Header ── */
.page-header {
  background: linear-gradient(135deg, var(--aspblue) 60%, var(--bookblue));
  color: #fff;
  padding: 2rem 2rem 1.4rem;
  border-bottom: 3px solid var(--aspgold);
}
.page-header .type-badge {
  display: inline-block;
  padding: 0.18em 0.7em;
  border-radius: 4px;
  font-size: 0.72rem;
  font-family: 'Helvetica Neue', sans-serif;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}
.badge-animation { background: var(--bookgreen); }
.badge-quiz      { background: var(--quizcolor); }
.badge-extra     { background: var(--extracolor); }
.badge-ai        { background: var(--aspgold); }

.page-header h1 {
  font-size: 1.65rem;
  font-weight: 700;
  margin-top: 0.25rem;
  letter-spacing: -0.01em;
}
.page-header .chapter-label {
  font-size: 0.82rem;
  opacity: 0.75;
  margin-top: 0.3rem;
  font-family: 'Helvetica Neue', sans-serif;
}

/* ── Main content ── */
main { max-width: 860px; margin: 0 auto; padding: 1.6rem 1.2rem 3rem; }

/* ── Canvas container ── */
.canvas-wrap {
  background: var(--card-bg);
  border: 1.5px solid #dde3ea;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.2rem;
  margin-bottom: 1.5rem;
  text-align: center;
}

/* ── Controls ── */
.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  justify-content: center;
  margin-bottom: 1.2rem;
}
.btn {
  padding: 0.45em 1.2em;
  border: none;
  border-radius: 6px;
  font-family: 'Helvetica Neue', sans-serif;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s;
}
.btn:hover { opacity: 0.88; transform: translateY(-1px); }
.btn-primary   { background: var(--bookblue);   color: #fff; }
.btn-secondary { background: var(--bookorange);  color: #fff; }
.btn-ghost     { background: #e8edf4; color: var(--aspblue); }

/* ── Info card ── */
.info-card {
  background: var(--card-bg);
  border-left: 4px solid var(--bookblue);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 1rem 1.2rem;
  margin-bottom: 1.2rem;
  box-shadow: var(--shadow);
  font-size: 0.95rem;
}
.info-card h2 {
  font-size: 1.05rem;
  color: var(--bookblue);
  margin-bottom: 0.4rem;
}

/* ── Quiz specific ── */
.quiz-question {
  background: var(--card-bg);
  border: 1.5px solid #dde3ea;
  border-radius: var(--radius);
  padding: 1.2rem 1.4rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow);
}
.quiz-question .q-num {
  font-family: 'Helvetica Neue', sans-serif;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--quizcolor);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.4rem;
}
.quiz-question p { font-size: 1rem; margin-bottom: 0.8rem; }
.quiz-question label {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  padding: 0.4em 0.5em;
  border-radius: 5px;
  cursor: pointer;
  transition: background 0.12s;
  font-size: 0.95rem;
}
.quiz-question label:hover { background: #f0f4fa; }
.quiz-question input[type="radio"] { margin-top: 0.25em; accent-color: var(--quizcolor); }

.answer-correct { background: #e6f9ee !important; border-color: #4caf50 !important; }
.answer-wrong   { background: #fde8e8 !important; border-color: #e53935 !important; }

.score-box {
  text-align: center;
  padding: 1.5rem;
  background: var(--card-bg);
  border-radius: var(--radius);
  border: 2px solid var(--bookblue);
  margin-top: 1.5rem;
  display: none;
}
.score-box .score-num { font-size: 2.4rem; font-weight: 700; color: var(--bookblue); }
.score-box .score-msg { font-size: 0.95rem; margin-top: 0.4rem; color: #555; }

/* ── Footer ── */
footer {
  text-align: center;
  padding: 1.2rem;
  font-size: 0.78rem;
  color: #888;
  font-family: 'Helvetica Neue', sans-serif;
  border-top: 1px solid #e0e0e0;
}

/* ── Responsive ── */
@media (max-width: 600px) {
  .page-header h1 { font-size: 1.3rem; }
  main { padding: 1rem 0.8rem; }
}