:root {
  --bg: #09111f;
  --panel: #121d33;
  --panel2: #1b2740;
  --line: rgba(255,255,255,0.12);
  --text: #eef4ff;
  --muted: #a8b5d3;
  --accent: #4bb3ff;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: linear-gradient(180deg, #08111f, #0d1730);
  color: var(--text);
}
.login-body {
  min-height: 100vh;
  display: grid;
  place-items: center;
}
.login-card {
  width: min(420px, 92vw);
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 28px;
}
.login-card input, .jump-form input, .quiz-form-row input {
  width: 100%;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.04);
  color: var(--text);
  margin: 8px 0 14px;
}
.login-card button, .btn {
  display: inline-block;
  text-decoration: none;
  padding: 12px 18px;
  border: none;
  border-radius: 12px;
  background: linear-gradient(135deg, #42abff, #7cecff);
  color: #032240;
  font-weight: 700;
  cursor: pointer;
}
.btn.secondary {
  background: rgba(255,255,255,0.06);
  color: var(--text);
  border: 1px solid var(--line);
}
.btn.disabled { pointer-events: none; opacity: .45; }
.alert.error {
  background: rgba(255,107,107,.16);
  border: 1px solid rgba(255,107,107,.35);
  color: #ffc9c9;
  padding: 10px 14px;
  border-radius: 12px;
  margin-bottom: 16px;
}
.layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 280px;
  background: rgba(255,255,255,0.03);
  border-right: 1px solid var(--line);
  padding: 24px;
}
.sidebar nav { display: grid; gap: 10px; margin-top: 20px; }
.sidebar nav a {
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--text);
  text-decoration: none;
  background: rgba(255,255,255,0.04);
}
.sidebar nav a.active { background: rgba(75,179,255,0.12); }
.content { flex: 1; padding: 28px; }
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}
.card, .panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 18px;
  margin-bottom: 18px;
}
.big { font-size: 32px; font-weight: 700; }
.table-wrap { overflow: auto; }
table {
  width: 100%;
  border-collapse: collapse;
}
th, td {
  border-bottom: 1px solid var(--line);
  padding: 12px 10px;
  text-align: left;
  white-space: nowrap;
}
.reader-shell { max-width: 1200px; margin: 0 auto; padding: 22px; }
.reader-topbar, .reader-nav {
  display: flex; justify-content: space-between; align-items: center; gap: 14px; flex-wrap: wrap;
}
.reader-frame {
  margin-top: 18px;
  background: #fff;
  color: #111;
  border-radius: 18px;
  min-height: 70vh;
  overflow: hidden;
  padding: 24px;
}
.reader-frame p, .reader-frame li { line-height: 1.7; }
.jump-form { display: flex; align-items: center; gap: 10px; }
.jump-form input { width: 100px; margin: 0; }
.quiz-box {
  margin-top: 18px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 18px;
}
.quiz-form-row { display: flex; gap: 12px; align-items: center; }
.quiz-form-row input { max-width: 140px; margin: 0; }
.missing-page { padding: 40px; }
.login-demo { margin-top: 14px; color: var(--muted); font-size: 14px; }
@media (max-width: 900px) {
  .layout { flex-direction: column; }
  .sidebar { width: 100%; }
}


.book-page-image-wrap{display:flex;justify-content:center;align-items:flex-start;padding:8px 0;}
.book-page-image{max-width:100%;height:auto;display:block;border-radius:12px;box-shadow:0 12px 30px rgba(0,0,0,.15);}
.reader-frame{background:#fff;padding:18px;border-radius:16px;overflow:auto;}
.reader-frame img{background:#fff;}