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

:root {
  --primary: #7c4dff;
  --primary-dark: #5e35b1;
  --success: #43a047;
  --danger: #e53935;
  --warning: #f57c00;
  --bg: #f5f5f7;
  --card: #ffffff;
  --text: #1a1a2e;
  --muted: #757575;
  --border: #e0e0e0;
  --radius: 16px;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
  --transition: 0.2s ease;
}

[data-theme="dark"] {
  --bg: #0f0f1a;
  --card: #1a1a2e;
  --text: #e8e8f0;
  --muted: #9090a8;
  --border: #2a2a3e;
  --shadow: 0 4px 24px rgba(0,0,0,0.3);
}

body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  transition: background var(--transition), color var(--transition);
}

/* ── NAVBAR ── */
.navbar {
  background: var(--card);
  box-shadow: 0 2px 8px rgba(0,0,0,0.06);
  padding: 0 20px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background var(--transition);
}
.navbar .logo { font-size: 1.15rem; font-weight: 700; color: var(--primary); text-decoration: none; }
.navbar .nav-links { display: flex; gap: 4px; align-items: center; }
.navbar .nav-links a {
  color: var(--muted);
  text-decoration: none;
  font-size: 0.88rem;
  padding: 6px 10px;
  border-radius: 8px;
  transition: background var(--transition), color var(--transition);
  white-space: nowrap;
}
.navbar .nav-links a:hover { background: var(--bg); color: var(--text); }
.navbar .nav-links a.active { color: var(--primary); font-weight: 600; }
.theme-toggle {
  background: none; border: none; cursor: pointer;
  font-size: 1.2rem; padding: 6px; border-radius: 8px;
  transition: background var(--transition);
}
.theme-toggle:hover { background: var(--bg); }

/* ── HAMBURGER (mobile) ── */
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 6px; }
.hamburger span { display: block; width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: var(--transition); }
.mobile-menu {
  display: none; position: fixed; top: 60px; left: 0; right: 0;
  background: var(--card); box-shadow: var(--shadow); z-index: 99;
  padding: 12px; flex-direction: column; gap: 4px;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  padding: 12px 16px; border-radius: 10px; text-decoration: none;
  color: var(--text); font-weight: 500; transition: background var(--transition);
}
.mobile-menu a:hover { background: var(--bg); }

/* ── CONTAINER ── */
.container { max-width: 680px; margin: 32px auto; padding: 0 16px; }

/* ── CARD ── */
.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 28px;
  transition: background var(--transition);
  animation: fadeUp 0.3s ease;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
@keyframes pop {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.08); }
  100% { transform: scale(1); }
}

/* ── HERO ── */
.hero { text-align: center; padding: 64px 16px 32px; animation: fadeIn 0.5s ease; }
.hero h1 { font-size: 2rem; font-weight: 800; color: var(--primary); margin-bottom: 10px; }
.hero p { font-size: 1rem; color: var(--muted); margin-bottom: 28px; }

/* ── FORMS ── */
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-weight: 600; margin-bottom: 6px; font-size: 0.88rem; color: var(--muted); }
.form-group input {
  width: 100%; padding: 12px 14px;
  border: 2px solid var(--border); border-radius: 10px;
  font-size: 1rem; transition: border-color var(--transition);
  outline: none; background: var(--bg); color: var(--text);
}
.form-group input:focus { border-color: var(--primary); }

/* ── BUTTONS ── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 12px 24px; border: none; border-radius: 10px;
  font-size: 0.95rem; font-weight: 600; cursor: pointer;
  transition: background var(--transition), transform 0.1s, opacity var(--transition);
  text-decoration: none; text-align: center;
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-ghost { background: var(--bg); color: var(--text); }
.btn-ghost:hover { background: var(--border); }
.btn-full { width: 100%; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }
.btn-sm { padding: 7px 14px; font-size: 0.85rem; }

/* ── ALERT ── */
.alert { padding: 12px 16px; border-radius: 10px; margin-bottom: 16px; font-size: 0.93rem; }
.alert-error { background: #ffebee; color: var(--danger); border: 1px solid #ffcdd2; }
.alert-success { background: #e8f5e9; color: var(--success); border: 1px solid #c8e6c9; }

/* ── DASHBOARD ── */
.dash-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 20px; }
.dash-card {
  background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow);
  padding: 24px 20px; text-align: center; text-decoration: none; color: var(--text);
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  animation: fadeUp 0.3s ease;
}
.dash-card:hover { transform: translateY(-4px); box-shadow: 0 8px 32px rgba(0,0,0,0.12); }
.dash-card .icon { font-size: 2.2rem; }
.dash-card .title { font-size: 1rem; font-weight: 700; }
.dash-card .desc { font-size: 0.8rem; color: var(--muted); }
.streak-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: #fff3e0; color: #e65100; border-radius: 20px;
  padding: 5px 14px; font-weight: 700; font-size: 0.95rem; margin-top: 6px;
  animation: pop 0.5s ease;
}
[data-theme="dark"] .streak-badge { background: #2d1a00; color: #ffb74d; }

/* ── TOPIC SELECT ── */
.topic-select { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.topic-btn {
  padding: 7px 14px; border-radius: 20px; border: 2px solid var(--border);
  background: var(--card); cursor: pointer; font-size: 0.85rem;
  color: var(--text); transition: all var(--transition);
}
.topic-btn:hover, .topic-btn.active { border-color: var(--primary); background: var(--primary); color: #fff; }

/* ── QUESTION ── */
.question-meta { font-size: 0.82rem; color: var(--muted); margin-bottom: 6px; }
.question-text { font-size: 1.1rem; font-weight: 600; line-height: 1.55; margin-bottom: 18px; }

.options { display: flex; flex-direction: column; gap: 10px; }
.option-btn {
  padding: 13px 16px; border-radius: 12px; border: 2px solid var(--border);
  background: var(--card); text-align: left; cursor: pointer; font-size: 0.95rem;
  color: var(--text); transition: all var(--transition);
  display: flex; align-items: center; gap: 12px;
}
.option-btn:hover:not(:disabled) { border-color: var(--primary); background: #f3f0ff; }
[data-theme="dark"] .option-btn:hover:not(:disabled) { background: #2a1a4e; }
.option-btn .letter {
  width: 30px; height: 30px; border-radius: 50%; background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; flex-shrink: 0; transition: background var(--transition);
}
.option-btn.correct { border-color: var(--success); background: #e8f5e9; animation: pop 0.3s ease; }
.option-btn.correct .letter { background: var(--success); color: #fff; }
.option-btn.wrong { border-color: var(--danger); background: #ffebee; }
.option-btn.wrong .letter { background: var(--danger); color: #fff; }
.option-btn:disabled { cursor: default; }
[data-theme="dark"] .option-btn.correct { background: #1b3a1b; }
[data-theme="dark"] .option-btn.wrong { background: #3a1b1b; }

.result-banner {
  padding: 13px 16px; border-radius: 12px; font-size: 0.97rem; font-weight: 600;
  margin-bottom: 14px; display: none; animation: fadeIn 0.25s ease;
}
.result-banner.correct { background: #e8f5e9; color: var(--success); }
.result-banner.wrong { background: #ffebee; color: var(--danger); }
[data-theme="dark"] .result-banner.correct { background: #1b3a1b; }
[data-theme="dark"] .result-banner.wrong { background: #3a1b1b; }

/* ── PROGRESS ── */
.progress-bar-wrap { background: var(--border); border-radius: 8px; height: 7px; margin-bottom: 6px; }
.progress-bar { height: 7px; border-radius: 8px; background: var(--primary); transition: width 0.4s ease; }
.progress-label { font-size: 0.82rem; color: var(--muted); margin-bottom: 16px; }

/* ── TIMER ── */
.timer { font-size: 0.92rem; font-weight: 600; color: var(--muted); text-align: right; margin-bottom: 14px; }
.timer.urgent { color: var(--danger); animation: pop 1s infinite; }

/* ── RESULT ── */
.result-screen { text-align: center; animation: fadeUp 0.4s ease; }
.result-screen .big-score { font-size: 3.5rem; font-weight: 900; color: var(--primary); animation: pop 0.5s ease; }
.result-screen .result-detail { font-size: 1rem; color: var(--muted); margin: 8px 0 24px; }
.result-emoji { font-size: 3rem; margin-bottom: 8px; }
.result-message { font-size: 1.1rem; font-weight: 700; margin-bottom: 4px; }

/* ── AUTH ── */
.auth-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 16px; background: var(--bg); }
.auth-card { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 36px; width: 100%; max-width: 400px; animation: fadeUp 0.4s ease; }
.auth-card h1 { font-size: 1.5rem; font-weight: 800; margin-bottom: 4px; }
.auth-card .subtitle { color: var(--muted); margin-bottom: 24px; font-size: 0.92rem; }
.auth-footer { text-align: center; margin-top: 18px; font-size: 0.88rem; color: var(--muted); }
.auth-footer a { color: var(--primary); text-decoration: none; font-weight: 600; }

/* ── TABS ── */
.tab-btn {
  padding: 8px 18px; border-radius: 20px; border: 2px solid var(--border);
  background: var(--card); cursor: pointer; font-size: 0.9rem; font-weight: 600;
  color: var(--text); transition: all var(--transition);
}
.tab-btn.active { border-color: var(--primary); background: var(--primary); color: #fff; }

/* ── LEADERBOARD ── */
.lb-row {
  display: flex; align-items: center; gap: 14px; padding: 12px 0;
  border-bottom: 1px solid var(--border); transition: background var(--transition);
}
.lb-row:last-child { border-bottom: none; }
.lb-row.me { background: #f3f0ff; border-radius: 10px; padding: 12px; margin: 0 -12px; }
[data-theme="dark"] .lb-row.me { background: #2a1a4e; }
.lb-rank { width: 32px; text-align: center; font-weight: 800; font-size: 1.1rem; }
.lb-name { flex: 1; font-weight: 600; }
.lb-stats { font-size: 0.82rem; color: var(--muted); }

/* ── ACHIEVEMENTS ── */
.badges-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 12px; }
.badge-item {
  background: var(--bg); border-radius: 14px; padding: 16px 12px; text-align: center;
  transition: all var(--transition); border: 2px solid transparent;
}
.badge-item.earned { border-color: var(--primary); background: #f3f0ff; animation: pop 0.4s ease; }
[data-theme="dark"] .badge-item.earned { background: #2a1a4e; }
.badge-item.locked { opacity: 0.4; filter: grayscale(1); }
.badge-icon { font-size: 2rem; margin-bottom: 6px; }
.badge-title { font-size: 0.82rem; font-weight: 700; margin-bottom: 2px; }
.badge-desc { font-size: 0.72rem; color: var(--muted); }

/* ── WEAK TOPIC BANNER ── */
.weak-banner {
  background: linear-gradient(135deg, #fff3e0, #ffe0b2);
  border-radius: 14px; padding: 16px 20px; margin-bottom: 16px;
  display: flex; align-items: center; gap: 14px; cursor: pointer;
  transition: transform var(--transition); border: 2px solid #ffb74d;
  text-decoration: none; color: var(--text);
}
[data-theme="dark"] .weak-banner { background: linear-gradient(135deg, #2d1a00, #3d2400); border-color: #e65100; }
.weak-banner:hover { transform: translateY(-2px); }

/* ── QUESTIONS BROWSER ── */
.q-row {
  padding: 12px 0; border-bottom: 1px solid var(--border);
  font-size: 0.9rem; line-height: 1.4;
}
.q-row:last-child { border-bottom: none; }
.q-topic { font-size: 0.75rem; color: var(--primary); font-weight: 600; margin-bottom: 3px; }

/* ── PROFILE ── */
.avatar {
  width: 72px; height: 72px; border-radius: 50%; background: var(--primary);
  display: flex; align-items: center; justify-content: center;
  font-size: 2rem; color: white; margin: 0 auto 16px; font-weight: 700;
}
.divider { border: none; border-top: 1px solid var(--border); margin: 20px 0; }

/* ── QUICK TEST ── */
.qt-counter { text-align: center; font-size: 1rem; font-weight: 700; color: var(--primary); margin-bottom: 16px; }

/* ── ADMIN PANEL ── */
.admin-layout { display: flex; min-height: 100vh; }
.admin-sidebar {
  width: 230px; background: var(--card); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; position: fixed; top: 0; left: 0; bottom: 0;
  z-index: 50; transition: background var(--transition), border-color var(--transition);
}
.admin-logo {
  padding: 20px 22px; font-size: 1.1rem; font-weight: 800; color: var(--primary);
  border-bottom: 1px solid var(--border); letter-spacing: -0.3px;
}
.admin-nav { padding: 10px; flex: 1; overflow-y: auto; }
.admin-nav a {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 14px; border-radius: 10px; text-decoration: none;
  color: var(--text); font-size: 0.91rem; font-weight: 500;
  transition: background var(--transition), color var(--transition);
  margin-bottom: 4px;
}
.admin-nav a:hover { background: var(--bg); }
.admin-nav a.active { background: var(--primary); color: #fff; }
.admin-sidebar-footer {
  padding: 16px; border-top: 1px solid var(--border);
}
.admin-sidebar-footer a {
  color: var(--muted); text-decoration: none; font-size: 0.88rem;
  display: block; padding: 6px 8px; border-radius: 8px; transition: background var(--transition);
}
.admin-sidebar-footer a:hover { background: var(--bg); color: var(--text); }
.admin-main {
  margin-left: 230px; flex: 1; padding: 32px;
  min-height: 100vh; background: var(--bg); transition: background var(--transition);
}
.admin-header { margin-bottom: 24px; }
.admin-header h1 { font-size: 1.5rem; font-weight: 800; }

.admin-stat-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(155px, 1fr));
  gap: 14px; margin-bottom: 24px;
}
.admin-stat-card {
  background: var(--card); border-radius: 14px; padding: 20px 18px;
  box-shadow: var(--shadow); transition: background var(--transition);
}
.admin-stat-card .stat-val { font-size: 2rem; font-weight: 900; color: var(--primary); }
.admin-stat-card .stat-lbl { font-size: 0.8rem; color: var(--muted); margin-top: 4px; }

.admin-table-wrap { overflow-x: auto; }
.admin-table { width: 100%; border-collapse: collapse; font-size: 0.88rem; }
.admin-table th {
  text-align: left; padding: 10px 14px; font-size: 0.75rem;
  text-transform: uppercase; letter-spacing: 0.5px;
  color: var(--muted); border-bottom: 2px solid var(--border);
  background: var(--bg);
}
.admin-table td { padding: 12px 14px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.admin-table tr:last-child td { border-bottom: none; }
.admin-table tr:hover td { background: var(--bg); transition: background 0.15s; }

.badge-status { padding: 3px 10px; border-radius: 12px; font-size: 0.78rem; font-weight: 700; white-space: nowrap; }
.badge-status.pending  { background: #fff3e0; color: #e65100; }
.badge-status.resolved { background: #e8f5e9; color: #2e7d32; }
.badge-status.rejected { background: #ffebee; color: #c62828; }
[data-theme="dark"] .badge-status.pending  { background: #3d2400; color: #ffb74d; }
[data-theme="dark"] .badge-status.resolved { background: #1b3a1b; color: #81c784; }
[data-theme="dark"] .badge-status.rejected { background: #3a1b1b; color: #ef9a9a; }

.badge-access { padding: 3px 10px; border-radius: 12px; font-size: 0.78rem; font-weight: 700; white-space: nowrap; }
.badge-access.active  { background: #e8f5e9; color: #2e7d32; }
.badge-access.expired { background: #ffebee; color: #c62828; }
[data-theme="dark"] .badge-access.active  { background: #1b3a1b; color: #81c784; }
[data-theme="dark"] .badge-access.expired { background: #3a1b1b; color: #ef9a9a; }

/* ── MODAL ── */
.modal-overlay {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,0.5); z-index: 999;
  align-items: center; justify-content: center;
}
.modal-overlay.open { display: flex; }
.modal-box {
  background: var(--card); border-radius: var(--radius);
  box-shadow: 0 8px 40px rgba(0,0,0,0.25); padding: 28px;
  width: 90%; max-width: 440px; animation: fadeUp 0.2s ease;
  max-height: 90vh; overflow-y: auto;
}

/* ── DISPUTE BUTTON ── */
.dispute-link {
  display: inline-flex; align-items: center; gap: 5px;
  color: var(--muted); font-size: 0.8rem; cursor: pointer;
  background: none; border: none; padding: 5px 10px; border-radius: 8px;
  transition: background var(--transition), color var(--transition);
  margin-top: 6px;
}
.dispute-link:hover { background: var(--bg); color: var(--danger); }

/* ── RESPONSIVE ── */
@media (max-width: 600px) {
  .dash-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .dash-card { padding: 18px 12px; }
  .dash-card .icon { font-size: 1.8rem; }
  .dash-card .title { font-size: 0.88rem; }
  .dash-card .desc { display: none; }
  .hero h1 { font-size: 1.6rem; }
  .auth-card { padding: 24px 18px; }
  .card { padding: 20px; }
  .navbar .nav-links { display: none; }
  .hamburger { display: flex; }
  .container { margin: 20px auto; }
  .badges-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 900px) {
  .admin-sidebar { width: 200px; }
  .admin-main { margin-left: 200px; padding: 20px; }
  .admin-stat-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 640px) {
  .admin-sidebar { display: none; }
  .admin-main { margin-left: 0; padding: 16px; }
  .admin-stat-grid { grid-template-columns: 1fr 1fr; }
}