/* Base */
* { box-sizing: border-box; }
:root {
  --bg: #0b1220;
  --card: #121a2b;
  --muted: #93a1b1;
  --text: #e9eef5;
  --primary: #4f8cff;
  --primary-700: #3c6bd6;
  --accent: #12d6b0;
  --shadow: rgba(0,0,0,0.25);
}
html, body {
  margin: 0;
  padding: 0;
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: linear-gradient(180deg, #0b1220 0%, #0f1830 100%);
}
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 16px;
}
.btn {
  display: inline-block;
  padding: 12px 18px;
  border-radius: 12px;
  text-decoration: none;
  font-weight: 600;
  border: 0;
  cursor: pointer;
}
.btn-primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 8px 20px var(--shadow);
}
.btn-primary:hover { background: var(--primary-700); }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: rgba(11,18,32,0.85);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
}
.brand { display: flex; align-items: center; gap: 12px; }
.logo {
  width: 40px; height: 40px; border-radius: 10px;
  display: grid; place-items: center; font-weight: 800;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #081221;
}
.brand-text h1 { font-size: 18px; margin: 0; }
.subtitle { margin: 2px 0 0; color: var(--muted); font-size: 12px; }

/* Hero */
.hero { padding: 36px 0 20px; text-align: center; }
.hero h2 { font-size: 28px; margin: 0 0 8px; }
.hero p { color: var(--muted); margin: 0; }

/* Groups Grid */
.groups-section { padding: 10px 0 24px; }
.groups-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.card {
  background: var(--card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 16px;
  padding: 16px;
  box-shadow: 0 6px 16px var(--shadow);
}
.card h4 { margin: 0 0 4px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 13px; }
.card .card-actions { margin-top: 12px; display: flex; gap: 8px; align-items: center; justify-content: space-between; }
.card .badge {
  display: inline-block; padding: 4px 8px; border-radius: 999px;
  font-size: 12px; background: rgba(255,255,255,0.06); color: var(--muted);
}

/* Simulator */
.simulator {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 16px;
  padding: 20px;
  margin: 8px 0 28px;
  box-shadow: 0 6px 16px var(--shadow);
}
.simulator h3 { margin: 0 0 12px; }
.sim-form { display: grid; gap: 12px; }
.form-row { display: grid; gap: 6px; }
.results {
  display: grid; gap: 6px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
  padding: 12px; border-radius: 12px;
}
.res-item { display: flex; justify-content: space-between; font-size: 15px; }

/* Schedule Table */
.schedule { margin-top: 12px; }
.schedule-table {
  width: 100%;
  border-collapse: collapse;
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 12px;
  overflow: hidden;
}
.schedule-table th, .schedule-table td {
  padding: 10px 12px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  text-align: left;
}
.schedule-table tfoot td {
  font-weight: 700;
}

/* Footer */
.site-footer { padding: 18px 0 28px; border-top: 1px solid rgba(255,255,255,0.06); }
.footer-inner {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  color: var(--muted); font-size: 13px;
}
.site-footer a { color: var(--text); text-decoration: underline; }

/* Modal */
.modal.hidden { display: none; }
.modal {
  position: fixed; inset: 0; background: rgba(0,0,0,0.6);
  display: grid; place-items: center; padding: 16px;
}
.modal-card {
  width: 100%; max-width: 520px; background: var(--card);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: 16px; padding: 16px; position: relative;
  box-shadow: 0 12px 28px var(--shadow);
}
.modal-close {
  position: absolute; top: 8px; right: 10px; width: 36px; height: 36px;
  border-radius: 10px; border: 1px solid rgba(255,255,255,0.12);
  background: rgba(255,255,255,0.04); color: var(--text); font-size: 20px; cursor: pointer;
}
.modal-body h4 { margin: 6px 0 6px; }
.modal-body p { color: var(--muted); margin-top: 0; }

/* Desktop */
@media (min-width: 768px) {
  .groups-grid { grid-template-columns: repeat(5, 1fr); }
  .hero h2 { font-size: 36px; }
  .brand-text h1 { font-size: 20px; }
}