@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
  --bg: #03050a;
  --bg2: #0a1120;
  --card: rgba(14,21,38,0.6);
  --border: rgba(79,142,247,0.15);
  --primary: #5c9cfc;
  --primary-dark: #3b82f6;
  --secondary: #8b5cf6;
  --accent: #f59e0b;
  --success: #10b981;
  --danger: #ef4444;
  --text: #f1f5f9;
  --text2: #94a3b8;
  --text3: #475569;
  --radius: 16px;
  --shadow: 0 10px 40px -10px rgba(0,0,0,0.5);
  --glow: 0 0 20px rgba(92,156,252,0.15);
}

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

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  background-image: 
    radial-gradient(at 0% 0%, rgba(92,156,252,0.08) 0px, transparent 50%),
    radial-gradient(at 100% 100%, rgba(139,92,246,0.08) 0px, transparent 50%);
  background-attachment: fixed;
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
}

/* ── SCROLLBAR ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }

/* ── NAVBAR ── */
.navbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 2rem; height: 64px;
  background: rgba(6,9,18,0.9);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  position: sticky; top: 0; z-index: 100;
}
.nav-logo {
  font-size: 1.3rem; font-weight: 800; letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
  text-decoration: none;
}
.nav-links { display: flex; gap: 1.5rem; }
.nav-links a {
  color: var(--text2); text-decoration: none; font-size: 0.875rem;
  font-weight: 500; transition: color 0.2s;
}
.nav-links a:hover { color: var(--text); }
.nav-btn {
  background: var(--primary); color: #fff; border: none;
  padding: 0.45rem 1.1rem; border-radius: 8px; font-size: 0.85rem;
  font-weight: 600; cursor: pointer; text-decoration: none;
  transition: background 0.2s, transform 0.1s;
}
.nav-btn:hover { background: var(--primary-dark); transform: translateY(-1px); }

/* ── HERO ── */
.hero {
  text-align: center; padding: 6rem 2rem 4rem;
  background: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(92,156,252,0.15) 0%, transparent 80%);
  position: relative;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 0.4rem;
  background: rgba(79,142,247,0.1); border: 1px solid rgba(79,142,247,0.3);
  color: var(--primary); padding: 0.3rem 1rem; border-radius: 50px;
  font-size: 0.8rem; font-weight: 600; margin-bottom: 1.5rem; letter-spacing: 0.5px;
}
.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem); font-weight: 800;
  line-height: 1.15; letter-spacing: -1px; margin-bottom: 1rem;
}
.hero h1 span {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero p { color: var(--text2); font-size: 1.05rem; max-width: 540px; margin: 0 auto 2rem; }
.hero-actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* ── BUTTONS ── */
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.7rem 1.5rem; border-radius: 10px; font-weight: 600;
  font-size: 0.9rem; cursor: pointer; transition: all 0.2s; text-decoration: none;
  border: none; font-family: 'Inter', sans-serif;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(79,142,247,0.35); }
.btn-outline { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { opacity: 0.9; transform: translateY(-2px); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { opacity: 0.9; }
.btn-secondary { background: rgba(124,58,237,0.15); color: var(--secondary); border: 1px solid rgba(124,58,237,0.3); }
.btn-secondary:hover { background: rgba(124,58,237,0.25); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none !important; }

/* ── STATS ── */
.stats-bar {
  display: flex; justify-content: center; gap: 3rem;
  padding: 2rem; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
  background: var(--bg2); flex-wrap: wrap;
}
.stat { text-align: center; }
.stat-num { font-size: 1.8rem; font-weight: 800; color: var(--primary); }
.stat-label { font-size: 0.8rem; color: var(--text2); margin-top: 0.2rem; }

/* ── SECTION ── */
.section { padding: 3rem 2rem; max-width: 1200px; margin: 0 auto; }
.section-title {
  font-size: 1.5rem; font-weight: 700; margin-bottom: 0.4rem;
}
.section-sub { color: var(--text2); font-size: 0.9rem; margin-bottom: 2rem; }

/* ── CARDS ── */
.cards-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1.2rem;
}
.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.5rem;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}
.card:hover { border-color: rgba(92,156,252,0.4); transform: translateY(-4px); box-shadow: var(--shadow), var(--glow); }
.card-tag {
  display: inline-block; font-size: 0.75rem; font-weight: 600;
  padding: 0.25rem 0.7rem; border-radius: 50px; margin-bottom: 0.8rem;
  background: rgba(79,142,247,0.1); color: var(--primary); border: 1px solid rgba(79,142,247,0.2);
}
.card-tag.purple { background: rgba(124,58,237,0.1); color: #a78bfa; border-color: rgba(124,58,237,0.2); }
.card-tag.amber { background: rgba(245,158,11,0.1); color: var(--accent); border-color: rgba(245,158,11,0.2); }
.card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 0.5rem; }
.card p { color: var(--text2); font-size: 0.85rem; margin-bottom: 1rem; }
.card-meta {
  display: flex; gap: 1rem; font-size: 0.8rem; color: var(--text3);
  border-top: 1px solid var(--border); padding-top: 0.8rem; margin-top: 0.5rem; flex-wrap: wrap;
}
.card-meta span { display: flex; align-items: center; gap: 0.3rem; }

/* ── UPLOAD AREA ── */
.upload-area {
  border: 2px dashed var(--border); border-radius: var(--radius);
  padding: 3rem 2rem; text-align: center; cursor: pointer;
  transition: all 0.2s; position: relative; background: rgba(14,21,38,0.5);
}
.upload-area:hover, .upload-area.dragover {
  border-color: var(--primary); background: rgba(79,142,247,0.05);
}
.upload-icon { font-size: 3rem; margin-bottom: 1rem; opacity: 0.6; }
.upload-area h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.upload-area p { color: var(--text2); font-size: 0.875rem; }
#fileInput { display: none; }

/* ── PROGRESS ── */
.progress-bar-wrap { background: rgba(255,255,255,0.05); border-radius: 50px; height: 8px; overflow: hidden; }
.progress-bar { height: 100%; border-radius: 50px; background: linear-gradient(90deg, var(--primary), var(--secondary)); transition: width 0.4s ease; }

/* ── FORM ── */
.form-group { margin-bottom: 1.2rem; }
.form-label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 0.5rem; color: var(--text2); }
.form-input, .form-select, .form-textarea {
  width: 100%; background: rgba(14,21,38,0.8);
  border: 1px solid var(--border); border-radius: 10px;
  color: var(--text); font-family: 'Inter', sans-serif; font-size: 0.9rem;
  padding: 0.7rem 1rem; transition: border-color 0.2s; outline: none;
}
.form-input:focus, .form-select:focus, .form-textarea:focus { border-color: var(--primary); }
.form-textarea { resize: vertical; min-height: 80px; }
.form-select option { background: var(--bg2); }

/* ── QUIZ EDITOR TABLE ── */
.question-editor {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); margin-bottom: 1rem; overflow: hidden;
}
.q-header {
  display: flex; align-items: center; gap: 1rem;
  padding: 1rem 1.2rem; background: rgba(14,21,38,0.6);
  border-bottom: 1px solid var(--border);
}
.q-num {
  background: var(--primary); color: #fff; width: 28px; height: 28px;
  border-radius: 8px; display: flex; align-items: center; justify-content: center;
  font-size: 0.8rem; font-weight: 700; flex-shrink: 0;
}
.q-body { padding: 1rem 1.2rem; }
.options-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.5rem; margin-top: 0.8rem; }
.option-item {
  display: flex; align-items: center; gap: 0.5rem;
  background: rgba(14,21,38,0.5); border: 1px solid var(--border);
  border-radius: 8px; padding: 0.5rem 0.8rem;
}
.option-item.correct { border-color: var(--success); background: rgba(16,185,129,0.1); }
.option-label {
  font-weight: 700; font-size: 0.85rem; color: var(--primary); width: 20px; flex-shrink: 0;
}
.option-item.correct .option-label { color: var(--success); }

/* ── QUIZ PAGE ── */
.quiz-wrap { max-width: 780px; margin: 0 auto; padding: 2rem; }
.quiz-header {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.2rem 1.5rem;
  margin-bottom: 1.5rem; display: flex; align-items: center; gap: 1rem; flex-wrap: wrap;
}
.quiz-title-block { flex: 1; }
.quiz-title-block h2 { font-size: 1.1rem; font-weight: 700; }
.quiz-title-block p { font-size: 0.8rem; color: var(--text2); }
.timer-box {
  background: rgba(245,158,11,0.1); border: 1px solid rgba(245,158,11,0.3);
  color: var(--accent); padding: 0.5rem 1rem; border-radius: 8px;
  font-size: 1.2rem; font-weight: 800; font-variant-numeric: tabular-nums;
  min-width: 90px; text-align: center;
}
.timer-box.danger { background: rgba(239,68,68,0.1); border-color: rgba(239,68,68,0.4); color: var(--danger); animation: pulse 1s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:0.6} }

.quiz-progress { margin-bottom: 1.5rem; }
.quiz-progress-info { display: flex; justify-content: space-between; margin-bottom: 0.5rem; font-size: 0.8rem; color: var(--text2); }

.question-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.8rem;
  animation: fadeIn 0.3s ease;
}
@keyframes fadeIn { from{opacity:0;transform:translateY(8px)} to{opacity:1;transform:none} }
.question-num { font-size: 0.8rem; color: var(--primary); font-weight: 600; margin-bottom: 0.6rem; }
.question-text { font-size: 1rem; font-weight: 500; margin-bottom: 1.5rem; line-height: 1.7; }

.options-list { display: flex; flex-direction: column; gap: 0.7rem; }
.option-btn {
  display: flex; align-items: center; gap: 0.8rem;
  background: rgba(14,21,38,0.6); border: 1.5px solid var(--border);
  border-radius: 10px; padding: 0.85rem 1.1rem; cursor: pointer;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1); text-align: left; color: var(--text);
  font-size: 0.9rem; font-family: 'Inter', sans-serif; width: 100%;
}
.option-btn:hover:not(:disabled) {
  background: rgba(92,156,252,0.08); border-color: rgba(92,156,252,0.4); transform: translateX(2px); box-shadow: 0 4px 12px rgba(92,156,252,0.1);
}

.option-btn.selected { border-color: var(--primary); background: rgba(79,142,247,0.15); color: #fff; }
.option-btn.correct { border-color: var(--success); background: rgba(16,185,129,0.15); }
.option-btn.wrong { border-color: var(--danger); background: rgba(239,68,68,0.12); }
.option-btn.disabled { cursor: default; pointer-events: none; }
.option-key {
  width: 28px; height: 28px; border-radius: 7px; font-weight: 700; font-size: 0.85rem;
  background: rgba(255,255,255,0.06); display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; transition: all 0.18s;
}
.option-btn.selected .option-key { background: var(--primary); }
.option-btn.correct .option-key { background: var(--success); color: #fff; }
.option-btn.wrong .option-key { background: var(--danger); color: #fff; }

.quiz-nav { display: flex; align-items: center; justify-content: space-between; margin-top: 1.5rem; flex-wrap: wrap; gap: 1rem; }
.quiz-nav-dots { display: flex; gap: 0.35rem; flex-wrap: wrap; }
.dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: var(--text3); cursor: pointer; transition: all 0.2s;
}
.dot.answered { background: var(--primary); }
.dot.current { background: var(--accent); transform: scale(1.3); }

/* ── RESULT PAGE ── */
.result-wrap { max-width: 700px; margin: 0 auto; padding: 2rem; }
.score-circle {
  width: 140px; height: 140px; border-radius: 50%; margin: 0 auto 1.5rem;
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  border: 4px solid var(--primary); background: radial-gradient(circle, rgba(79,142,247,0.15), transparent);
  position: relative;
}
.score-circle::after {
  content: ''; position: absolute; inset: -8px; border-radius: 50%;
  border: 1px solid rgba(79,142,247,0.2);
}
.score-num { font-size: 2.5rem; font-weight: 800; line-height: 1; }
.score-label { font-size: 0.75rem; color: var(--text2); }
.result-stats {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin: 1.5rem 0;
}
.r-stat {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1rem; text-align: center;
}
.r-stat-num { font-size: 1.6rem; font-weight: 800; }
.r-stat-label { font-size: 0.78rem; color: var(--text2); margin-top: 0.2rem; }
.r-stat.green .r-stat-num { color: var(--success); }
.r-stat.red .r-stat-num { color: var(--danger); }
.r-stat.blue .r-stat-num { color: var(--primary); }

/* ── REVIEW ITEM ── */
.review-item {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); margin-bottom: 1rem; overflow: hidden;
}
.review-header {
  display: flex; align-items: center; gap: 0.8rem; padding: 0.8rem 1.2rem;
  border-bottom: 1px solid var(--border); font-size: 0.85rem;
}
.review-badge {
  padding: 0.2rem 0.6rem; border-radius: 50px; font-size: 0.75rem; font-weight: 600;
}
.review-badge.correct { background: rgba(16,185,129,0.15); color: var(--success); }
.review-badge.wrong { background: rgba(239,68,68,0.12); color: var(--danger); }
.review-body { padding: 1rem 1.2rem; font-size: 0.875rem; }

/* ── TOAST ── */
.toast {
  position: fixed; bottom: 1.5rem; right: 1.5rem;
  background: var(--card); border: 1px solid var(--border);
  border-radius: 10px; padding: 0.8rem 1.2rem;
  font-size: 0.875rem; z-index: 9999;
  animation: slideUp 0.3s ease;
  backdrop-filter: blur(12px);
}
@keyframes slideUp { from{opacity:0;transform:translateY(20px)} to{opacity:1;transform:none} }
.toast.success { border-color: var(--success); color: var(--success); }
.toast.error { border-color: var(--danger); color: var(--danger); }

/* ── MODAL ── */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.7);
  backdrop-filter: blur(4px); z-index: 200;
  display: flex; align-items: center; justify-content: center; padding: 1rem;
}
.modal {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 18px; padding: 2rem; max-width: 480px; width: 100%;
  animation: fadeIn 0.2s ease;
}
.modal h3 { font-size: 1.2rem; font-weight: 700; margin-bottom: 0.5rem; }
.modal p { color: var(--text2); font-size: 0.875rem; margin-bottom: 1.5rem; }
.modal-actions { display: flex; gap: 0.8rem; justify-content: flex-end; }

/* ── EMPTY STATE ── */
.empty-state { text-align: center; padding: 4rem 2rem; color: var(--text2); }
.empty-icon { font-size: 3rem; margin-bottom: 1rem; opacity: 0.4; }

/* ── TAGS INPUT ── */
.input-hint { font-size: 0.75rem; color: var(--text3); margin-top: 0.3rem; }

/* ── CHIPS ── */
.chip {
  display: inline-flex; align-items: center; gap: 0.3rem;
  background: rgba(79,142,247,0.1); color: var(--primary);
  border: 1px solid rgba(79,142,247,0.2); border-radius: 50px;
  padding: 0.2rem 0.7rem; font-size: 0.75rem; font-weight: 500;
}

/* ── LOADER ── */
.loader {
  display: inline-block; width: 20px; height: 20px;
  border: 2px solid rgba(255,255,255,0.1); border-top-color: var(--primary);
  border-radius: 50%; animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── ADMIN LAYOUT (SIDEBAR) ── */
.admin-layout {
  display: flex; min-height: 100vh; background: var(--bg);
}
.admin-sidebar {
  width: 260px; background: var(--bg2); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; position: sticky; top: 0; height: 100vh;
}
.sidebar-header {
  padding: 1.5rem; border-bottom: 1px solid var(--border);
}
.sidebar-header h2 { font-size: 1.2rem; font-weight: 800; color: var(--text); }
.sidebar-header p { font-size: 0.8rem; color: var(--text2); margin-top: 0.2rem; }
.sidebar-nav {
  display: flex; flex-direction: column; padding: 1.5rem 1rem; gap: 0.5rem;
}
.sidebar-btn {
  background: transparent; border: none; color: var(--text2); text-align: left;
  padding: 0.8rem 1rem; border-radius: 8px; font-weight: 500; font-size: 0.9rem;
  cursor: pointer; transition: all 0.2s; display: flex; align-items: center; gap: 0.8rem;
}
.sidebar-btn:hover { background: rgba(255,255,255,0.05); color: var(--text); }
.sidebar-btn.active {
  background: rgba(79,142,247,0.15); color: var(--primary); font-weight: 600;
}
.admin-main {
  flex: 1; padding: 2.5rem 3rem; overflow-y: auto; max-width: 1000px;
}

@media (max-width: 900px) {
  .dashboard-container { grid-template-columns: 1fr !important; }
}

.admin-box {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 1.8rem; margin-bottom: 2rem;
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}
.admin-box h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 1.2rem; color: var(--text); border-bottom: 1px solid var(--border); padding-bottom: 0.8rem; }

/* ── FOOTER ── */
footer {
  border-top: 1px solid var(--border); text-align: center;
  padding: 2rem; color: var(--text3); font-size: 0.8rem; margin-top: 4rem;
}
footer span { color: var(--primary); }

@media (max-width: 768px) {
  .admin-layout { flex-direction: column; }
  .admin-sidebar { width: 100%; height: auto; position: static; border-right: none; border-bottom: 1px solid var(--border); }
  .sidebar-nav { flex-direction: row; flex-wrap: wrap; padding: 1rem; }
  .sidebar-btn { flex: 1 1 40%; justify-content: center; text-align: center; }
  .admin-main { padding: 1.5rem; }
  .options-grid { grid-template-columns: 1fr; }
  .result-stats { grid-template-columns: 1fr 1fr; }
  .stats-bar { gap: 1.5rem; }
  .quiz-header { flex-direction: column; align-items: flex-start; }
}