@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;600;700;800;900&family=Fredoka+One&display=swap');

:root {
  --primary: #6C63FF; --primary-light: #8B85FF; --primary-dark: #5A52D5;
  --secondary: #FF6584; --accent: #43D9AD; --warning: #FFB347;
  --danger: #FF6B6B; --info: #4DC9F6;
  --bg-main: #F0F2FF; --bg-card: #FFFFFF;
  --bg-sidebar: #1A1A2E; --bg-sidebar2: #16213E;
  --text-primary: #2D2D4E; --text-secondary: #6B7280; --text-muted: #9CA3AF;
  --shadow-sm: 0 2px 8px rgba(108,99,255,0.08);
  --shadow-md: 0 4px 20px rgba(108,99,255,0.12);
  --shadow-lg: 0 8px 40px rgba(108,99,255,0.18);
  --shadow-card: 0 4px 24px rgba(0,0,0,0.08);
  --radius-sm: 8px; --radius-md: 14px; --radius-lg: 20px;
  --radius-xl: 28px; --radius-full: 9999px;
  --sidebar-width: 250px;
  --transition: 0.2s cubic-bezier(0.4,0,0.2,1);
  --font-body: 'Nunito', sans-serif;
  --font-display: 'Fredoka One', cursive;
}
[data-theme="dark"] {
  --bg-main: #0F0F1E; --bg-card: #1A1A2E;
  --text-primary: #E2E8F0; --text-secondary: #94A3B8;
  --shadow-card: 0 4px 24px rgba(0,0,0,0.3);
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-body); background: var(--bg-main); color: var(--text-primary); line-height: 1.6; min-height: 100vh; overflow-x: hidden; }

/* Layout */
.app-wrapper { display: flex; min-height: 100vh; }

/* Sidebar */
.sidebar { width: var(--sidebar-width); background: linear-gradient(180deg, var(--bg-sidebar) 0%, var(--bg-sidebar2) 100%); color: #fff; position: fixed; top: 0; left: 0; bottom: 0; z-index: 100; display: flex; flex-direction: column; transition: transform 0.4s cubic-bezier(0.4,0,0.2,1); overflow-y: auto; overflow-x: hidden; }
.sidebar-logo { padding: 28px 20px 20px; display: flex; align-items: center; gap: 12px; text-decoration: none; border-bottom: 1px solid rgba(255,255,255,0.08); margin-bottom: 12px; }
.sidebar-logo .logo-icon { font-size: 32px; }
.sidebar-logo .logo-text { font-family: var(--font-display); font-size: 22px; color: #fff; }
.sidebar-user { padding: 16px 20px; display: flex; align-items: center; gap: 12px; background: rgba(255,255,255,0.05); margin: 0 12px 16px; border-radius: var(--radius-md); }
.sidebar-avatar { width: 44px; height: 44px; border-radius: var(--radius-full); display: flex; align-items: center; justify-content: center; font-size: 22px; border: 2px solid rgba(255,255,255,0.2); flex-shrink: 0; }
.sidebar-user-info .name { font-weight: 700; font-size: 14px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.sidebar-user-info .role { font-size: 11px; color: rgba(255,255,255,0.5); text-transform: uppercase; letter-spacing: 0.5px; }
.sidebar-xp { padding: 0 20px 16px; }
.sidebar-xp .xp-label { font-size: 11px; color: rgba(255,255,255,0.5); display: flex; justify-content: space-between; margin-bottom: 6px; }
.sidebar-xp .xp-bar-bg { height: 6px; background: rgba(255,255,255,0.1); border-radius: var(--radius-full); overflow: hidden; }
.sidebar-xp .xp-bar-fill { height: 100%; background: linear-gradient(90deg, var(--primary), var(--accent)); border-radius: var(--radius-full); transition: width 0.8s ease; }
.sidebar-nav { flex: 1; padding: 0 12px; }
.nav-section-title { font-size: 10px; font-weight: 700; color: rgba(255,255,255,0.35); text-transform: uppercase; letter-spacing: 1px; padding: 16px 8px 6px; }
.nav-link { display: flex; align-items: center; gap: 10px; padding: 11px 14px; border-radius: var(--radius-md); color: rgba(255,255,255,0.7); text-decoration: none; font-weight: 600; font-size: 14px; transition: all var(--transition); margin-bottom: 2px; }
.nav-link:hover { background: rgba(108,99,255,0.3); color: #fff; transform: translateX(4px); }
.nav-link.active { background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: #fff; box-shadow: 0 4px 14px rgba(108,99,255,0.4); }
.nav-link .nav-icon { font-size: 18px; width: 22px; text-align: center; }
.sidebar-footer { padding: 16px 20px; border-top: 1px solid rgba(255,255,255,0.08); }
.sidebar-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 99; }
.sidebar-overlay.active { display: block; }

/* Main */
.main-content { margin-left: var(--sidebar-width); flex: 1; min-height: 100vh; display: flex; flex-direction: column; }
.topbar { background: var(--bg-card); border-bottom: 1px solid rgba(0,0,0,0.06); padding: 14px 32px; display: flex; align-items: center; justify-content: space-between; position: sticky; top: 0; z-index: 50; box-shadow: var(--shadow-sm); }
.topbar-left { display: flex; align-items: center; gap: 16px; }
.topbar-title { font-size: 20px; font-weight: 800; }
.topbar-right { display: flex; align-items: center; gap: 12px; }
.sidebar-toggle { display: none; background: none; border: none; font-size: 22px; cursor: pointer; color: var(--text-primary); padding: 6px; }
.page-content { padding: 32px; flex: 1; }
.flash-messages { padding: 0 32px; margin-top: 12px; }

/* Cards */
.card { background: var(--bg-card); border-radius: var(--radius-lg); box-shadow: var(--shadow-card); overflow: hidden; }
.card-header { padding: 20px 24px 16px; border-bottom: 1px solid rgba(0,0,0,0.05); display: flex; align-items: center; justify-content: space-between; }
.card-title { font-size: 16px; font-weight: 800; display: flex; align-items: center; gap: 8px; }
.card-body { padding: 20px 24px; }

/* Stats */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; margin-bottom: 28px; }
.stat-card { background: var(--bg-card); border-radius: var(--radius-lg); padding: 20px 22px; box-shadow: var(--shadow-card); display: flex; align-items: center; gap: 16px; transition: transform var(--transition), box-shadow var(--transition); position: relative; overflow: hidden; }
.stat-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px; }
.stat-card.purple::before { background: linear-gradient(90deg, var(--primary), var(--primary-light)); }
.stat-card.pink::before { background: linear-gradient(90deg, var(--secondary), #FF9AAF); }
.stat-card.green::before { background: linear-gradient(90deg, var(--accent), #6EE7C4); }
.stat-card.orange::before { background: linear-gradient(90deg, var(--warning), #FFD47A); }
.stat-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.stat-icon { font-size: 36px; width: 60px; height: 60px; border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
.stat-icon.purple { background: rgba(108,99,255,0.12); }
.stat-icon.pink { background: rgba(255,101,132,0.12); }
.stat-icon.green { background: rgba(67,217,173,0.12); }
.stat-icon.orange { background: rgba(255,179,71,0.12); }
.stat-value { font-family: var(--font-display); font-size: 32px; line-height: 1; }
.stat-label { font-size: 13px; color: var(--text-muted); font-weight: 600; margin-top: 2px; }

/* Buttons */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 22px; border-radius: var(--radius-full); font-family: var(--font-body); font-size: 14px; font-weight: 700; cursor: pointer; text-decoration: none; border: none; transition: all var(--transition); white-space: nowrap; }
.btn:active { transform: scale(0.97); }
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: #fff; box-shadow: 0 4px 14px rgba(108,99,255,0.35); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(108,99,255,0.45); color: #fff; }
.btn-secondary { background: linear-gradient(135deg, var(--secondary), #FF9AAF); color: #fff; }
.btn-secondary:hover { transform: translateY(-2px); color: #fff; }
.btn-success { background: linear-gradient(135deg, var(--accent), #6EE7C4); color: #fff; }
.btn-success:hover { transform: translateY(-2px); color: #fff; }
.btn-danger { background: linear-gradient(135deg, var(--danger), #FF9595); color: #fff; }
.btn-danger:hover { transform: translateY(-2px); color: #fff; }
.btn-outline { background: transparent; border: 2px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-ghost { background: rgba(108,99,255,0.08); color: var(--primary); }
.btn-ghost:hover { background: rgba(108,99,255,0.16); }
.btn-sm { padding: 7px 16px; font-size: 13px; }
.btn-lg { padding: 14px 30px; font-size: 16px; }
.btn-icon { padding: 10px; border-radius: var(--radius-md); }

/* Forms */
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-size: 13px; font-weight: 700; color: var(--text-secondary); margin-bottom: 6px; text-transform: uppercase; letter-spacing: 0.5px; }
.form-control { width: 100%; padding: 11px 16px; border: 2px solid rgba(0,0,0,0.08); border-radius: var(--radius-md); font-family: var(--font-body); font-size: 14px; color: var(--text-primary); background: var(--bg-card); transition: border-color var(--transition); outline: none; }
.form-control:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(108,99,255,0.12); }
.form-error { color: var(--danger); font-size: 12px; margin-top: 4px; font-weight: 600; }
select.form-control { cursor: pointer; }
textarea.form-control { resize: vertical; min-height: 100px; }

/* Tables */
.table-wrapper { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th { text-align: left; font-size: 11px; font-weight: 800; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.8px; padding: 12px 16px; border-bottom: 2px solid rgba(0,0,0,0.06); background: rgba(0,0,0,0.02); }
td { padding: 14px 16px; border-bottom: 1px solid rgba(0,0,0,0.05); font-size: 14px; vertical-align: middle; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(108,99,255,0.03); }

/* Badges */
.badge { display: inline-flex; align-items: center; gap: 4px; padding: 4px 10px; border-radius: var(--radius-full); font-size: 12px; font-weight: 700; }
.badge-primary { background: rgba(108,99,255,0.12); color: var(--primary); }
.badge-success { background: rgba(67,217,173,0.12); color: #10B981; }
.badge-danger { background: rgba(255,107,107,0.12); color: var(--danger); }
.badge-warning { background: rgba(255,179,71,0.12); color: #D97706; }
.badge-secondary { background: rgba(255,101,132,0.12); color: var(--secondary); }
.badge-muted { background: rgba(0,0,0,0.06); color: var(--text-muted); }

/* Progress */
.progress { height: 10px; background: rgba(0,0,0,0.07); border-radius: var(--radius-full); overflow: hidden; }
.progress-bar { height: 100%; border-radius: var(--radius-full); background: linear-gradient(90deg, var(--primary), var(--primary-light)); transition: width 0.8s ease; }
.progress-bar.success { background: linear-gradient(90deg, var(--accent), #6EE7C4); }
.progress-bar.warning { background: linear-gradient(90deg, var(--warning), #FFD47A); }
.progress-bar.danger { background: linear-gradient(90deg, var(--danger), #FF9595); }

/* Alerts */
.alert { display: flex; align-items: center; gap: 12px; padding: 14px 18px; border-radius: var(--radius-md); font-size: 14px; font-weight: 600; margin-bottom: 10px; animation: slideDown 0.3s ease; }
@keyframes slideDown { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }
.alert-success { background: rgba(67,217,173,0.15); color: #065F46; border-left: 4px solid var(--accent); }
.alert-danger  { background: rgba(255,107,107,0.15); color: #991B1B; border-left: 4px solid var(--danger); }
.alert-warning { background: rgba(255,179,71,0.15);  color: #92400E; border-left: 4px solid var(--warning); }
.alert-info    { background: rgba(77,201,246,0.15);  color: #1E40AF; border-left: 4px solid var(--info); }
.alert-close { margin-left: auto; background: none; border: none; font-size: 18px; cursor: pointer; opacity: 0.5; }
.alert-close:hover { opacity: 1; }

/* Set cards */
.set-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.set-card { background: var(--bg-card); border-radius: var(--radius-lg); box-shadow: var(--shadow-card); overflow: hidden; transition: transform var(--transition), box-shadow var(--transition); display: flex; flex-direction: column; }
.set-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.set-card-header { padding: 20px; background: linear-gradient(135deg, rgba(108,99,255,0.08), rgba(108,99,255,0.02)); display: flex; align-items: center; gap: 12px; }
.set-emoji { font-size: 36px; width: 56px; height: 56px; background: rgba(255,255,255,0.8); border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; box-shadow: var(--shadow-sm); }
.set-card-title { font-weight: 800; font-size: 15px; margin-bottom: 2px; }
.set-card-meta { font-size: 12px; color: var(--text-muted); }
.set-card-footer { padding: 14px 20px; border-top: 1px solid rgba(0,0,0,0.05); display: flex; align-items: center; justify-content: space-between; gap: 8px; margin-top: auto; }

/* Gamification */
.level-badge { display: inline-flex; align-items: center; gap: 6px; background: linear-gradient(135deg, #FFB347, #FFD700); color: #7A4500; padding: 6px 14px; border-radius: var(--radius-full); font-weight: 800; font-size: 13px; }
.streak-badge { display: inline-flex; align-items: center; gap: 6px; background: linear-gradient(135deg, #FF6B6B, #FF8E8E); color: #fff; padding: 6px 14px; border-radius: var(--radius-full); font-weight: 800; font-size: 13px; }
.xp-popup { position: fixed; top: 20px; right: 20px; background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: #fff; padding: 14px 20px; border-radius: var(--radius-lg); font-weight: 800; font-size: 18px; box-shadow: var(--shadow-lg); z-index: 1000; animation: xpPopup 2.2s ease forwards; }
@keyframes xpPopup { 0% { opacity:0; transform:translateY(20px) scale(0.8); } 20% { opacity:1; transform:translateY(0) scale(1.1); } 40% { transform:scale(1); } 70% { opacity:1; } 100% { opacity:0; transform:translateY(-30px); } }

/* Quiz / Session */
.question-card { background: var(--bg-card); border-radius: var(--radius-xl); padding: 40px; box-shadow: var(--shadow-lg); text-align: center; max-width: 700px; margin: 0 auto; }
.question-number { font-size: 12px; font-weight: 700; color: var(--primary); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 12px; }
.question-text { font-size: 22px; font-weight: 800; margin-bottom: 32px; line-height: 1.4; }
.answers-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.answer-btn { padding: 16px 20px; border: 2px solid rgba(0,0,0,0.08); border-radius: var(--radius-md); background: var(--bg-card); font-family: var(--font-body); font-size: 14px; font-weight: 700; cursor: pointer; transition: all var(--transition); text-align: left; display: flex; align-items: center; gap: 12px; width: 100%; }
.answer-btn:hover { border-color: var(--primary); background: rgba(108,99,255,0.05); transform: scale(1.02); }
.answer-btn.correct { border-color: var(--accent); background: rgba(67,217,173,0.1); color: #065F46; }
.answer-btn.wrong { border-color: var(--danger); background: rgba(255,107,107,0.1); color: #991B1B; }
.answer-letter { width: 30px; height: 30px; border-radius: var(--radius-sm); background: rgba(108,99,255,0.1); color: var(--primary); font-weight: 800; display: flex; align-items: center; justify-content: center; font-size: 13px; flex-shrink: 0; }

/* Login */
.login-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, #6C63FF 0%, #FF6584 50%, #43D9AD 100%); padding: 20px; }
.login-card { background: var(--bg-card); border-radius: var(--radius-xl); padding: 48px 40px; width: 100%; max-width: 420px; box-shadow: 0 24px 80px rgba(0,0,0,0.2); animation: loginEntry 0.6s cubic-bezier(0.34,1.56,0.64,1); }
@keyframes loginEntry { from { opacity:0; transform:translateY(40px) scale(0.9); } to { opacity:1; transform:translateY(0) scale(1); } }
.login-logo { text-align: center; margin-bottom: 32px; }
.login-logo .emoji { font-size: 56px; display: block; margin-bottom: 12px; animation: bounce 2s infinite; }
.login-logo h1 { font-family: var(--font-display); font-size: 32px; color: var(--primary); }
.login-logo p { color: var(--text-muted); font-size: 14px; }
@keyframes bounce { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }

/* Emoji picker */
.emoji-grid { display: flex; flex-wrap: wrap; gap: 8px; padding: 12px; background: rgba(0,0,0,0.03); border-radius: var(--radius-md); max-height: 140px; overflow-y: auto; }
.emoji-option { font-size: 24px; cursor: pointer; padding: 4px; border-radius: 6px; transition: transform var(--transition); user-select: none; }
.emoji-option:hover { transform: scale(1.3); }
.emoji-option.selected { background: rgba(108,99,255,0.2); }

/* Pagination */
.pagination { display: flex; align-items: center; justify-content: center; gap: 6px; margin-top: 24px; }
.page-link { display: flex; align-items: center; justify-content: center; width: 36px; height: 36px; border-radius: var(--radius-sm); text-decoration: none; font-size: 14px; font-weight: 700; color: var(--text-secondary); background: var(--bg-card); border: 2px solid rgba(0,0,0,0.08); transition: all var(--transition); }
.page-link:hover, .page-link.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* Search */
.search-bar { position: relative; flex: 1; max-width: 400px; }
.search-bar input { width: 100%; padding: 10px 16px 10px 40px; border: 2px solid rgba(0,0,0,0.08); border-radius: var(--radius-full); font-family: var(--font-body); font-size: 14px; outline: none; background: rgba(0,0,0,0.03); transition: all var(--transition); }
.search-bar input:focus { border-color: var(--primary); background: var(--bg-card); box-shadow: 0 0 0 4px rgba(108,99,255,0.1); }
.search-bar .search-icon { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); color: var(--text-muted); }
.user-avatar { width: 36px; height: 36px; border-radius: var(--radius-full); display: flex; align-items: center; justify-content: center; font-size: 18px; border: 2px solid rgba(108,99,255,0.2); cursor: pointer; }

/* Leaderboard */
.leaderboard-item { display: flex; align-items: center; gap: 14px; padding: 14px 20px; border-radius: var(--radius-md); transition: background var(--transition); }
.leaderboard-item:hover { background: rgba(108,99,255,0.04); }
.leaderboard-rank { font-family: var(--font-display); font-size: 20px; width: 32px; text-align: center; color: var(--text-muted); }
.leaderboard-rank.gold   { color: #FFD700; }
.leaderboard-rank.silver { color: #C0C0C0; }
.leaderboard-rank.bronze { color: #CD7F32; }

/* Empty state */
.empty-state { text-align: center; padding: 60px 20px; color: var(--text-muted); }
.empty-state .empty-icon { font-size: 60px; margin-bottom: 16px; }
.empty-state h3 { font-size: 20px; font-weight: 800; margin-bottom: 8px; color: var(--text-secondary); }
.empty-state p { font-size: 14px; margin-bottom: 20px; }

/* Utilities */
.divider { height: 1px; background: rgba(0,0,0,0.07); margin: 20px 0; }
.spinner { width: 32px; height: 32px; border: 3px solid rgba(108,99,255,0.2); border-top-color: var(--primary); border-radius: 50%; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.flex { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.gap-8 { gap: 8px; } .gap-12 { gap: 12px; } .gap-16 { gap: 16px; } .gap-20 { gap: 20px; }
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.mt-8 { margin-top: 8px; } .mt-16 { margin-top: 16px; } .mt-24 { margin-top: 24px; }
.mb-8 { margin-bottom: 8px; } .mb-16 { margin-bottom: 16px; } .mb-24 { margin-bottom: 24px; }
.text-center { text-align: center; } .text-muted { color: var(--text-muted); font-size: 13px; }
.text-sm { font-size: 13px; } .font-bold { font-weight: 700; } .w-full { width: 100%; }
.gradient-text { background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }

/* Responsive */
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .sidebar-toggle { display: flex; }
  .main-content { margin-left: 0; }
  .page-content { padding: 16px; }
  .topbar { padding: 12px 16px; }
  .flash-messages { padding: 0 16px; }
  .answers-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .set-grid { grid-template-columns: 1fr; }
  .login-card { padding: 32px 24px; }
  .grid-2 { grid-template-columns: 1fr; }
}
@media (max-width: 480px) { .stats-grid { grid-template-columns: 1fr; } }