:root {
  --bg: #f3eee4;
  --paper: rgba(255, 252, 247, 0.9);
  --surface: rgba(255, 255, 255, 0.7);
  --ink: #1e1c18;
  --muted: #645f56;
  --line: rgba(44, 35, 23, 0.12);
  --primary: #0d5c52;
  --primary-strong: #09483f;
  --secondary: #ab6718;
  --danger: #932f2f;
  --correct: #146d45;
  --incorrect: #9b3030;
  --shadow: 0 20px 60px rgba(40, 28, 11, 0.14);
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  background:
    radial-gradient(circle at top left, rgba(13, 92, 82, 0.16), transparent 30%),
    radial-gradient(circle at right center, rgba(171, 103, 24, 0.12), transparent 28%),
    linear-gradient(180deg, #f8f4ee 0%, var(--bg) 100%);
  color: var(--ink);
  font-family: "Manrope", sans-serif;
}

.page-shell { width: min(1440px, calc(100% - 28px)); margin: 18px auto 36px; }
.hero { display: grid; grid-template-columns: 1.35fr 0.9fr; gap: 22px; margin-bottom: 22px; }
.hero-copy, .hero-panel, .panel {
  background: var(--paper);
  backdrop-filter: blur(12px);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}
.hero-copy { padding: 34px; border-radius: 28px; }
.hero-copy h1 { margin: 10px 0 14px; font-family: "Fraunces", serif; font-size: clamp(2.2rem, 4vw, 4rem); line-height: 0.96; letter-spacing: -0.03em; }
.eyebrow { margin: 0; text-transform: uppercase; letter-spacing: 0.18em; font-size: 0.75rem; font-weight: 800; color: var(--primary); }
.lede, .panel-head p, .status-text, .quiz-file, .feedback-panel p, .field span, .metric-label, .group-label, .material-text { color: var(--muted); }
.hero-panel { border-radius: 28px; padding: 26px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; align-items: end; }
.metric { padding: 16px 14px; border-radius: 20px; background: rgba(255, 255, 255, 0.6); border: 1px solid rgba(44, 35, 23, 0.08); }
.metric strong { display: block; font-size: 2rem; margin-top: 8px; }

.app-grid { display: grid; grid-template-columns: 390px 1fr; gap: 22px; }
.sidebar { display: grid; gap: 18px; align-content: start; }
.panel { border-radius: 24px; padding: 22px; }
.panel-head h2, .panel-head h3, .question-head h3, .feedback-panel h3, .quiz-meta-row h2, .materials-panel h3 {
  margin: 0 0 8px;
  font-family: "Fraunces", serif;
  letter-spacing: -0.02em;
}
.compact-head p { margin-bottom: 0; }
.source-group + .source-group { margin-top: 18px; }
.group-label { margin: 0 0 10px; font-size: 0.8rem; font-weight: 800; letter-spacing: 0.12em; text-transform: uppercase; }
.source-list, .subject-list { display: grid; gap: 10px; }
.subject-card, .source-card {
  width: 100%;
  text-align: left;
  padding: 14px 16px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.7);
  cursor: pointer;
}
.subject-card.active, .source-card.active { border-color: rgba(13, 92, 82, 0.45); background: rgba(13, 92, 82, 0.08); }
.subject-card-title, .source-card-title { display: block; font-weight: 800; margin-bottom: 6px; }
.subject-card-meta, .source-card-meta { display: flex; justify-content: space-between; gap: 8px; font-size: 0.88rem; color: var(--muted); }
.button-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 14px; }
.btn {
  border: 0;
  border-radius: 999px;
  padding: 12px 16px;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  transition: transform 140ms ease, opacity 140ms ease, background-color 140ms ease;
}
.btn:hover { transform: translateY(-1px); }
.btn:disabled { cursor: not-allowed; opacity: 0.55; transform: none; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-strong); }
.btn-secondary { background: var(--secondary); color: #fff; }
.btn-google { background: #ffffff; color: #1e1c18; border: 1px solid rgba(44, 35, 23, 0.14); box-shadow: inset 0 0 0 1px rgba(255,255,255,0.7); }
.btn-google:hover { background: #f6f3ef; }
.btn-muted, .btn-ghost { background: rgba(0, 0, 0, 0.06); color: var(--ink); }
.btn-danger { background: rgba(147, 47, 47, 0.14); color: var(--danger); }
.field { display: grid; gap: 8px; margin-top: 14px; }
.field input {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 12px 14px;
  font: inherit;
  background: rgba(255, 255, 255, 0.82);
}
.field-inline { grid-template-columns: auto 1fr; align-items: center; gap: 12px; margin-top: 0; }
.progress-wrap { margin-top: 18px; }
.progress-meta { display: flex; justify-content: space-between; gap: 12px; font-size: 0.95rem; }
.progress-track { width: 100%; height: 10px; border-radius: 999px; background: rgba(0, 0, 0, 0.08); overflow: hidden; margin-top: 10px; }
.progress-bar { width: 0; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--primary) 0%, #2ca48b 100%); transition: width 180ms ease; }
.jump-row { display: grid; grid-template-columns: 1fr auto; gap: 10px; align-items: end; margin-top: 16px; }

.quiz-panel { min-height: 760px; }
.quiz-meta-row { display: flex; justify-content: space-between; gap: 16px; align-items: start; }
.meta-pills { display: flex; gap: 10px; flex-wrap: wrap; justify-content: flex-end; }
.meta-pill { padding: 10px 14px; border-radius: 999px; background: rgba(0, 0, 0, 0.06); font-size: 0.88rem; font-weight: 800; }
.mode-toggle { display: flex; gap: 10px; margin-top: 22px; }
.mode-btn {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
  border-radius: 999px;
  padding: 12px 18px;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
}
.mode-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.materials-panel { margin-top: 24px; }
.materials-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.material-card {
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 18px;
}
.material-overview-card { grid-column: 1 / -1; }
.material-list { margin: 0; padding-left: 18px; display: grid; gap: 10px; line-height: 1.65; }
.glossary-list { display: grid; gap: 12px; }
.glossary-item {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px;
  background: rgba(255, 255, 255, 0.78);
}
.glossary-item strong { display: block; margin-bottom: 6px; }
.question-head { display: flex; justify-content: space-between; gap: 16px; align-items: start; margin-top: 22px; }
.question-badge { padding: 10px 14px; border-radius: 999px; font-size: 0.85rem; font-weight: 800; background: rgba(0, 0, 0, 0.06); }
.question-badge.correct { color: var(--correct); background: rgba(20, 109, 69, 0.12); }
.question-badge.incorrect { color: var(--incorrect); background: rgba(155, 48, 48, 0.12); }
.question-text { margin-top: 18px; font-size: 1.16rem; line-height: 1.75; color: var(--ink); }
.options-list { display: grid; gap: 12px; margin-top: 22px; }
.option {
  width: 100%;
  text-align: left;
  padding: 16px 18px;
  border-radius: 20px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.7);
  cursor: pointer;
}
.option:hover { border-color: rgba(13, 92, 82, 0.4); }
.option-label {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.07);
  font-weight: 800;
  margin-right: 12px;
}
.option.selected { border-color: rgba(13, 92, 82, 0.45); background: rgba(13, 92, 82, 0.08); }
.option.correct { border-color: rgba(20, 109, 69, 0.4); background: rgba(20, 109, 69, 0.1); }
.option.incorrect { border-color: rgba(155, 48, 48, 0.4); background: rgba(155, 48, 48, 0.08); }
.feedback-panel { margin-top: 28px; padding-top: 22px; border-top: 1px solid var(--line); }
.explanation-box, .gemini-output {
  margin-top: 12px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px 18px;
  line-height: 1.7;
}
.gemini-output strong { display: block; margin-bottom: 8px; }
.navigator-panel-inline { margin-top: 30px; padding-top: 24px; border-top: 1px solid var(--line); }
.question-nav { display: grid; grid-template-columns: repeat(auto-fill, minmax(48px, 1fr)); gap: 10px; margin-top: 12px; }
.nav-chip {
  min-height: 44px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.68);
  cursor: pointer;
  font: inherit;
  font-weight: 800;
}
.nav-chip.current { outline: 2px solid rgba(13, 92, 82, 0.4); }
.nav-chip.correct { background: rgba(20, 109, 69, 0.12); color: var(--correct); }
.nav-chip.incorrect { background: rgba(155, 48, 48, 0.12); color: var(--incorrect); }

@media (max-width: 1100px) {
  .hero, .app-grid { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .page-shell { width: min(100% - 18px, 100%); margin: 10px auto 24px; }
  .hero-copy, .hero-panel, .panel { padding: 18px; border-radius: 22px; }
  .hero-panel, .materials-grid { grid-template-columns: 1fr; }
  .quiz-meta-row, .question-head { flex-direction: column; }
  .meta-pills { justify-content: flex-start; }
  .jump-row { grid-template-columns: 1fr; }
}

.announcement-strip { margin-bottom: 22px; }
.announcement-list { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 14px; }
.announcement-card {
  padding: 18px;
  border-radius: 20px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
}
.announcement-card h3 { margin: 8px 0 10px; font-family: "Fraunces", serif; }
.announcement-card p { margin: 0; color: var(--muted); line-height: 1.65; }
.announcement-time { display: inline-block; margin-top: 12px; font-size: 0.85rem; color: var(--muted); }
.account-summary {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
}
.account-summary strong { font-size: 1rem; }
.helper-copy { margin-top: 14px; color: var(--muted); line-height: 1.6; }
textarea {
  width: 100%;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 12px 14px;
  font: inherit;
  background: rgba(255, 255, 255, 0.82);
}
.admin-panel { margin-top: 24px; }
.admin-actions { margin: 12px 0 8px; }
.admin-stat-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}
.admin-stat-card {
  padding: 18px;
  border-radius: 20px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
}
.admin-stat-card strong { display: block; margin-top: 8px; font-size: 1.9rem; }
.admin-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}
.admin-card { min-height: 100%; }
.admin-list {
  display: grid;
  gap: 12px;
}
.admin-list-item, .admin-list-empty {
  padding: 14px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.78);
}
.admin-list-item strong { display: block; margin-bottom: 6px; }
.admin-list-item span, .admin-list-empty { display: block; color: var(--muted); line-height: 1.55; }
@media (max-width: 900px) {
  .admin-stat-grid, .admin-grid { grid-template-columns: 1fr; }
}