:root {
  --primary: #1565C0;
  --primary-dark: #0D47A1;
  --primary-light: #E3F2FD;
  --accent: #F57F17;
  --success: #2E7D32;
  --danger: #C62828;
  --bg: #F5F7FA;
  --card: #ffffff;
  --text: #1A1A2E;
  --muted: #607D8B;
  --border: #E0E0E0;
  --radius: 12px;
  --shadow: 0 2px 16px rgba(0,0,0,0.09);
}

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

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  font-size: 16px;
  line-height: 1.6;
}

/* HEADER */
.header {
  background: var(--primary);
  color: #fff;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.18);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header .logo {
  font-size: 1.4rem;
  font-weight: 700;
  text-decoration: none;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 10px;
}
.header .logo span { color: #FFD740; }
.header nav a {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  margin-left: 20px;
  font-size: 0.95rem;
  transition: color .2s;
}
.header nav a:hover { color: #fff; }
.header nav a.btn-outline {
  border: 1.5px solid rgba(255,255,255,0.6);
  padding: 6px 16px;
  border-radius: 20px;
}
.header nav a.btn-outline:hover {
  background: rgba(255,255,255,0.15);
  border-color: #fff;
}

/* HERO */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, #1976D2 50%, #0D47A1 100%);
  color: #fff;
  padding: 64px 24px;
  text-align: center;
}
.hero h1 { font-size: 2.4rem; font-weight: 800; margin-bottom: 16px; }
.hero p { font-size: 1.15rem; opacity: .9; max-width: 600px; margin: 0 auto 32px; }
.hero .kz-flag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(255,255,255,0.15);
  border-radius: 30px;
  padding: 6px 20px;
  font-size: 0.9rem;
  margin-bottom: 24px;
}

/* CONTAINER */
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.section { padding: 48px 0; }

/* GRADE GRID */
.grade-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 16px;
  margin-top: 24px;
}
.grade-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  text-align: center;
  padding: 28px 16px;
  text-decoration: none;
  color: var(--text);
  border: 2px solid transparent;
  transition: all .2s;
  cursor: pointer;
}
.grade-card:hover, .grade-card.active {
  border-color: var(--primary);
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(21,101,192,0.18);
}
.grade-card .grade-num {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--primary);
  display: block;
}
.grade-card .grade-label { font-size: 0.85rem; color: var(--muted); margin-top: 4px; }

/* TEST CARDS */
.test-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin-top: 24px;
}
.test-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
  text-decoration: none;
  color: var(--text);
  border: 1.5px solid var(--border);
  transition: all .2s;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.test-card:hover {
  border-color: var(--primary);
  box-shadow: 0 6px 24px rgba(21,101,192,0.13);
  transform: translateY(-2px);
}
.test-card .badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 20px;
  padding: 3px 12px;
  font-size: 0.8rem;
  font-weight: 600;
  width: fit-content;
}
.test-card h3 { font-size: 1.05rem; font-weight: 700; line-height: 1.4; }
.test-card .meta {
  display: flex;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--muted);
}
.test-card .meta span { display: flex; align-items: center; gap: 4px; }
.test-card .start-btn {
  margin-top: auto;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 10px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background .2s;
  text-align: center;
  text-decoration: none;
  display: block;
}
.test-card .start-btn:hover { background: var(--primary-dark); }

/* SECTION TITLE */
.section-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 8px;
}
.section-sub { color: var(--muted); font-size: 0.95rem; }

/* FORM */
.form-wrap {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 40px;
  max-width: 480px;
  margin: 0 auto;
}
.form-wrap h2 { font-size: 1.5rem; font-weight: 700; margin-bottom: 24px; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-weight: 600; margin-bottom: 6px; font-size: 0.9rem; }
.form-group input, .form-group select {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  outline: none;
  transition: border-color .2s;
  background: #fff;
  color: var(--text);
}
.form-group input:focus, .form-group select:focus { border-color: var(--primary); }
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all .2s;
  text-decoration: none;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-success { background: var(--success); color: #fff; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-light { background: #fff; color: var(--text); border: 1.5px solid var(--border); }
.btn-light:hover { background: var(--bg); }
.btn-full { width: 100%; text-align: center; }

/* ALERT */
.alert {
  padding: 12px 16px;
  border-radius: 8px;
  margin-bottom: 16px;
  font-size: 0.9rem;
}
.alert-danger { background: #FFEBEE; color: var(--danger); border: 1px solid #FFCDD2; }
.alert-success { background: #E8F5E9; color: var(--success); border: 1px solid #C8E6C9; }
.alert-info { background: var(--primary-light); color: var(--primary); border: 1px solid #BBDEFB; }

/* TEST PAGE */
.test-page { max-width: 760px; margin: 0 auto; padding: 32px 20px; }
.test-header {
  background: var(--card);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 24px;
  box-shadow: var(--shadow);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.test-header h2 { font-size: 1.15rem; font-weight: 700; }
.timer {
  background: var(--primary-light);
  color: var(--primary);
  font-size: 1.3rem;
  font-weight: 700;
  padding: 8px 20px;
  border-radius: 30px;
  font-variant-numeric: tabular-nums;
}
.timer.warning { background: #FFF3E0; color: #E65100; }
.timer.danger { background: #FFEBEE; color: var(--danger); animation: pulse 1s infinite; }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.6} }

.progress-bar-wrap { background: var(--border); border-radius: 4px; height: 6px; margin-bottom: 24px; }
.progress-bar { background: var(--primary); height: 6px; border-radius: 4px; transition: width .3s; }

.question-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}
.question-num { font-size: 0.8rem; color: var(--muted); font-weight: 600; margin-bottom: 10px; text-transform: uppercase; letter-spacing: .5px; }
.question-text { font-size: 1.1rem; font-weight: 600; margin-bottom: 24px; line-height: 1.5; }

.options { display: flex; flex-direction: column; gap: 10px; }
.option-label {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 14px 18px;
  border: 2px solid var(--border);
  border-radius: 10px;
  cursor: pointer;
  transition: all .18s;
  background: #fafafa;
}
.option-label:hover { border-color: var(--primary); background: var(--primary-light); }
.option-label input[type=radio] { display: none; }
.option-label.selected {
  border-color: var(--primary);
  background: var(--primary-light);
}
.option-label.correct { border-color: var(--success); background: #E8F5E9; }
.option-label.wrong { border-color: var(--danger); background: #FFEBEE; }
.option-letter {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  flex-shrink: 0;
  margin-top: 2px;
}
.option-label.selected .option-letter { background: var(--primary); color: #fff; }
.option-label.correct .option-letter { background: var(--success); color: #fff; }
.option-label.wrong .option-letter { background: var(--danger); color: #fff; }
.option-text { font-size: 0.97rem; line-height: 1.4; }

.test-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  margin-top: 24px;
}

/* QUESTION NAV DOTS */
.q-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}
.q-dot {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  border: 2px solid var(--border);
  background: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all .15s;
  color: var(--text);
}
.q-dot.answered { background: var(--primary-light); border-color: var(--primary); color: var(--primary); }
.q-dot.current { background: var(--primary); border-color: var(--primary); color: #fff; }

/* RESULT PAGE */
.result-wrap { max-width: 700px; margin: 0 auto; padding: 40px 20px; }
.result-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 40px;
  text-align: center;
}
.score-circle {
  width: 140px;
  height: 140px;
  border-radius: 50%;
  margin: 0 auto 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 2.4rem;
  font-weight: 800;
  border: 6px solid;
}
.score-circle.excellent { border-color: var(--success); color: var(--success); background: #E8F5E9; }
.score-circle.good { border-color: #1976D2; color: #1976D2; background: var(--primary-light); }
.score-circle.average { border-color: var(--accent); color: var(--accent); background: #FFF8E1; }
.score-circle.poor { border-color: var(--danger); color: var(--danger); background: #FFEBEE; }
.score-circle .score-label { font-size: 0.75rem; font-weight: 500; margin-top: 2px; }

.result-title { font-size: 1.5rem; font-weight: 700; margin-bottom: 8px; }
.result-sub { color: var(--muted); margin-bottom: 32px; }
.result-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 32px;
}
.result-stat {
  background: var(--bg);
  border-radius: 10px;
  padding: 16px 12px;
}
.result-stat .val { font-size: 1.6rem; font-weight: 700; color: var(--primary); }
.result-stat .lbl { font-size: 0.8rem; color: var(--muted); margin-top: 4px; }

/* ADMIN */
.admin-layout { display: flex; min-height: 100vh; }
.sidebar {
  width: 240px;
  background: #1A237E;
  color: #fff;
  flex-shrink: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}
.sidebar .sidebar-brand {
  padding: 20px 20px 16px;
  font-size: 1.1rem;
  font-weight: 700;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.sidebar nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 20px;
  color: rgba(255,255,255,0.75);
  text-decoration: none;
  font-size: 0.95rem;
  transition: all .2s;
  border-left: 3px solid transparent;
}
.sidebar nav a:hover, .sidebar nav a.active {
  background: rgba(255,255,255,0.08);
  color: #fff;
  border-left-color: #FFD740;
}
.admin-main { flex: 1; padding: 32px; background: var(--bg); overflow-x: hidden; }
.admin-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
}
.admin-header h1 { font-size: 1.5rem; font-weight: 700; }
.table-wrap { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
table { width: 100%; border-collapse: collapse; }
th { background: var(--bg); padding: 12px 16px; text-align: left; font-size: 0.85rem; color: var(--muted); font-weight: 600; border-bottom: 1.5px solid var(--border); }
td { padding: 14px 16px; border-bottom: 1px solid var(--border); font-size: 0.93rem; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: #fafafa; }
.badge-grade {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary);
  border-radius: 12px;
  padding: 2px 10px;
  font-size: 0.8rem;
  font-weight: 600;
}

/* STATS CARDS */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}
.stat-card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px 24px;
}
.stat-card .val { font-size: 2rem; font-weight: 800; color: var(--primary); }
.stat-card .lbl { font-size: 0.85rem; color: var(--muted); margin-top: 4px; }

/* MISC */
.text-center { text-align: center; }
.mt-1 { margin-top: 8px; } .mt-2 { margin-top: 16px; } .mt-3 { margin-top: 24px; } .mt-4 { margin-top: 32px; }
.mb-1 { margin-bottom: 8px; } .mb-2 { margin-bottom: 16px; }
.text-muted { color: var(--muted); font-size: 0.9rem; }
.d-flex { display: flex; } .gap-2 { gap: 16px; } .align-center { align-items: center; }

.breadcrumb { font-size: 0.85rem; color: var(--muted); margin-bottom: 16px; }
.breadcrumb a { color: var(--primary); text-decoration: none; }
.breadcrumb a:hover { text-decoration: underline; }

/* FOOTER */
.footer {
  text-align: center;
  padding: 32px 20px;
  color: var(--muted);
  font-size: 0.85rem;
  border-top: 1px solid var(--border);
  margin-top: 48px;
}

@media (max-width: 640px) {
  .hero h1 { font-size: 1.7rem; }
  .grade-grid { grid-template-columns: repeat(4, 1fr); }
  .result-stats { grid-template-columns: 1fr; }
  .admin-layout { flex-direction: column; }
  .sidebar { width: 100%; }
  .form-wrap { padding: 24px 16px; }
}