:root {
  --bg: #f8fafc;
  --surface: #ffffff;
  --surface-subtle: #f1f5f9;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --text-main: #0f172a;
  --text-muted: #64748b;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-light: #eff6ff;
  --accent: #16a34a;
  --radius: 12px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  background-color: var(--bg);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.gen-header {
  border-bottom: 1px solid var(--border);
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}
.gen-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-main);
  font-weight: 800;
  font-size: 1.15rem;
}
.gen-logo-badge {
  background: var(--primary);
  color: #fff;
  padding: 3px 8px;
  border-radius: 6px;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.5px;
}
.gen-nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
  transition: color 0.2s;
}
.gen-nav-link:hover { color: var(--primary); }

.gen-container {
  max-width: 960px;
  width: 100%;
  margin: 28px auto;
  padding: 0 20px 60px;
}

.gen-hero {
  text-align: center;
  margin-bottom: 30px;
}
.gen-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 14px;
  border-radius: 999px;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
  color: #1d4ed8;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 12px;
}
.gen-hero h1 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 900;
  letter-spacing: -0.5px;
  color: var(--text-main);
  margin-bottom: 8px;
}
.gen-hero h1 span {
  color: var(--primary);
}
.gen-hero p {
  color: var(--text-muted);
  font-size: 0.98rem;
  max-width: 620px;
  margin: 0 auto;
}

.gen-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 22px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.03);
}
.gen-card-title {
  font-size: 1.05rem;
  font-weight: 800;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-main);
}
.gen-card-title .step-num {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--primary-light);
  border: 1px solid #bfdbfe;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.78rem;
  font-weight: 800;
  color: var(--primary);
}

/* Exam Cards */
.exam-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}
.exam-btn {
  background: #ffffff;
  border: 1.5px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  cursor: pointer;
  text-align: left;
  transition: all 0.2s;
  color: var(--text-main);
  display: flex;
  flex-direction: column;
  gap: 5px;
}
.exam-btn:hover {
  border-color: var(--primary);
  background: #f8fafc;
  transform: translateY(-2px);
}
.exam-btn.active {
  border-color: var(--primary);
  background: var(--primary-light);
  box-shadow: 0 0 0 1px var(--primary);
}
.exam-btn-icon { font-size: 1.5rem; }
.exam-btn-name { font-weight: 800; font-size: 0.95rem; }
.exam-btn-meta { font-size: 0.75rem; color: var(--text-muted); }

/* Mode Switcher: CBT Mode vs Practice Mode */
.mode-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.mode-btn {
  background: #ffffff;
  border: 2px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  cursor: pointer;
  text-align: left;
  transition: all 0.2s;
  display: flex;
  align-items: flex-start;
  gap: 14px;
}
.mode-btn:hover { border-color: var(--primary); }
.mode-btn.active {
  border-color: var(--primary);
  background: var(--primary-light);
  box-shadow: 0 0 0 1px var(--primary);
}
.mode-icon { font-size: 1.8rem; line-height: 1; }
.mode-title { font-weight: 800; font-size: 0.98rem; color: var(--text-main); margin-bottom: 4px; }
.mode-desc { font-size: 0.78rem; color: var(--text-muted); line-height: 1.5; }

/* Subject Chips */
.subject-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.subject-chip {
  background: var(--surface-subtle);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 16px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  color: var(--text-muted);
  user-select: none;
  transition: all 0.2s;
}
.subject-chip.active {
  background: var(--primary-light);
  border-color: var(--primary);
  color: var(--primary);
  font-weight: 700;
}

/* Filters */
.filter-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}
.filter-group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 8px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
.pill-selector {
  display: flex;
  background: var(--surface-subtle);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 4px;
  gap: 4px;
}
.pill-btn {
  flex: 1;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.82rem;
  padding: 8px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s;
}
.pill-btn.active {
  background: #ffffff;
  color: var(--text-main);
  font-weight: 800;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}

.count-grid {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.count-btn {
  border: 1.5px solid var(--border);
  background: #ffffff;
  color: var(--text-main);
  border-radius: 10px;
  padding: 10px 18px;
  font-weight: 800;
  font-size: 0.9rem;
  cursor: pointer;
  transition: all 0.2s;
}
.count-btn.active {
  border-color: var(--primary);
  background: var(--primary-light);
  color: var(--primary);
}

/* Live Summary */
.summary-bar {
  background: #ffffff;
  border: 1.5px solid var(--primary);
  border-radius: var(--radius);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  box-shadow: 0 4px 16px rgba(37, 99, 235, 0.08);
}
.summary-metrics {
  display: flex;
  gap: 28px;
  flex-wrap: wrap;
}
.summary-metric { display: flex; flex-direction: column; gap: 2px; }
.metric-val { font-size: 1.4rem; font-weight: 900; color: var(--text-main); }
.metric-label { font-size: 0.75rem; color: var(--text-muted); text-transform: uppercase; font-weight: 700; }

.gen-submit-btn {
  background: var(--primary);
  color: #ffffff;
  border: none;
  border-radius: 12px;
  padding: 16px 36px;
  font-size: 1rem;
  font-weight: 800;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: transform 0.2s, background 0.2s;
}
.gen-submit-btn:hover {
  background: var(--primary-hover);
  transform: translateY(-2px);
}
.gen-submit-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

@media (max-width: 640px) {
  .mode-grid { grid-template-columns: 1fr; }
  .summary-bar { flex-direction: column; align-items: stretch; }
  .gen-submit-btn { justify-content: center; width: 100%; }
}