:root {
  --teal: #0d9488;
  --teal-dark: #0f766e;
  --teal-light: #5eead4;
  --teal-bg: #ccfbf1;
  --orange: #f97316;
  --orange-dark: #ea580c;
  --orange-light: #fdba74;
  --orange-bg: #ffedd5;
  --surface: #f8fafc;
  --card: #ffffff;
  --text: #134e4a;
  --text-muted: #64748b;
  --danger: #dc2626;
  --success: #059669;
  --border: #99f6e4;
  --shadow: 0 4px 20px rgba(13, 148, 136, 0.12);
}

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

body {
  font-family: 'Segoe UI', system-ui, sans-serif;
  background: linear-gradient(135deg, var(--teal-bg) 0%, var(--orange-bg) 100%);
  min-height: 100vh;
  color: var(--text);
}

.app-header {
  background: linear-gradient(90deg, var(--teal-dark), var(--teal));
  color: white;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: var(--shadow);
}

.app-header h1 { font-size: 1.35rem; font-weight: 700; }
.app-header .badge {
  background: var(--orange);
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

.layout { display: flex; min-height: calc(100vh - 64px); }

.sidebar {
  width: 220px;
  background: var(--card);
  border-right: 2px solid var(--border);
  padding: 1rem 0;
  flex-shrink: 0;
}

.nav-btn {
  display: block;
  width: 100%;
  text-align: left;
  padding: 0.75rem 1.25rem;
  border: none;
  background: none;
  color: var(--text);
  font-size: 0.95rem;
  cursor: pointer;
  border-left: 4px solid transparent;
  transition: all 0.2s;
}

.nav-btn:hover { background: var(--teal-bg); }
.nav-btn.active {
  background: var(--teal-bg);
  border-left-color: var(--orange);
  font-weight: 600;
  color: var(--teal-dark);
}

.main { flex: 1; padding: 1.5rem; overflow: auto; }

.panel { display: none; }
.panel.active { display: block; }

.card {
  background: var(--card);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.card h2 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  color: var(--teal-dark);
  border-bottom: 2px solid var(--orange);
  padding-bottom: 0.5rem;
  display: inline-block;
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.stat-box {
  background: linear-gradient(135deg, var(--teal), var(--teal-dark));
  color: white;
  padding: 1rem;
  border-radius: 10px;
  text-align: center;
}

.stat-box.orange {
  background: linear-gradient(135deg, var(--orange), var(--orange-dark));
}

.stat-box .num { font-size: 2rem; font-weight: 700; }
.stat-box .label { font-size: 0.8rem; opacity: 0.9; }

.form-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: flex-end;
  margin-bottom: 1rem;
}

label { font-size: 0.8rem; color: var(--text-muted); display: block; margin-bottom: 0.25rem; }

input, select, button {
  font-family: inherit;
  font-size: 0.9rem;
}

input, select {
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  min-width: 120px;
}

input:focus, select:focus {
  outline: none;
  border-color: var(--teal);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.2);
}

.btn {
  padding: 0.5rem 1rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
  transition: transform 0.15s, opacity 0.15s;
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary { background: var(--teal); color: white; }
.btn-primary:hover { background: var(--teal-dark); }

.btn-orange { background: var(--orange); color: white; }
.btn-orange:hover { background: var(--orange-dark); }

.btn-outline {
  background: white;
  color: var(--teal-dark);
  border: 2px solid var(--teal);
}

.btn-danger { background: var(--danger); color: white; }
.btn-sm { padding: 0.3rem 0.6rem; font-size: 0.8rem; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

th, td {
  padding: 0.6rem 0.75rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

th {
  background: var(--teal-bg);
  color: var(--teal-dark);
  font-weight: 600;
}

tr:hover td { background: rgba(204, 251, 241, 0.4); }

.schedule-grid {
  overflow-x: auto;
  margin-top: 1rem;
}

.schedule-grid table { min-width: 700px; }

.schedule-grid th:first-child,
.schedule-grid td:first-child {
  background: var(--orange-bg);
  font-weight: 600;
  white-space: nowrap;
}

.cell-filled {
  background: linear-gradient(135deg, var(--teal-bg), #fff);
  cursor: pointer;
  vertical-align: top;
  min-width: 100px;
}

.cell-filled:hover { background: var(--teal-light); color: var(--teal-dark); }
.cell-empty { background: #f1f5f9; cursor: pointer; }
.cell-empty:hover { background: var(--orange-bg); }
.cell-disabled { background: #e2e8f0; color: #94a3b8; cursor: not-allowed; }

.cell-mapel { font-weight: 600; color: var(--teal-dark); font-size: 0.8rem; }
.cell-guru { font-size: 0.75rem; color: var(--text-muted); }

.alert {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

.alert-error { background: #fee2e2; color: var(--danger); border: 1px solid #fecaca; }
.alert-success { background: #d1fae5; color: var(--success); border: 1px solid #a7f3d0; }
.alert-info { background: var(--teal-bg); color: var(--teal-dark); border: 1px solid var(--border); }

.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(15, 118, 110, 0.4);
  z-index: 100;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal-overlay.show { display: flex; }

.modal {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  max-width: 420px;
  width: 100%;
  box-shadow: var(--shadow);
  border-top: 4px solid var(--orange);
}

.modal h3 { margin-bottom: 1rem; color: var(--teal-dark); }

.modal .form-group { margin-bottom: 0.75rem; }
.modal .actions { display: flex; gap: 0.5rem; margin-top: 1rem; justify-content: flex-end; }

.toolbar { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 1rem; align-items: center; }

.progress-bar {
  height: 8px;
  background: #e2e8f0;
  border-radius: 4px;
  overflow: hidden;
  margin-top: 0.25rem;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--teal), var(--orange));
  transition: width 0.3s;
}

.empty-state {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
}

.rekomendasi-box {
  margin-top: 0.75rem;
  padding: 0.75rem;
  background: var(--orange-bg);
  border-radius: 8px;
  border: 1px dashed var(--orange);
}

.rekomendasi-box strong {
  display: block;
  font-size: 0.85rem;
  color: var(--orange-dark);
  margin-bottom: 0.5rem;
}

.rekomendasi-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.chip-rekomendasi {
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--teal);
  background: white;
  color: var(--teal-dark);
  border-radius: 999px;
  font-size: 0.78rem;
  cursor: pointer;
  transition: all 0.15s;
}

.chip-rekomendasi:hover {
  background: var(--teal);
  color: white;
}

.pengaturan-grid input[type="number"] {
  width: 70px;
  text-align: center;
}

.setting-jadwal-wrap {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.kelas-jadwal-block {
  border: 2px solid var(--border);
  border-radius: 10px;
  padding: 1rem;
  background: #fff;
}

.kelas-jadwal-block h3 {
  color: var(--teal-dark);
  margin-bottom: 0.75rem;
  font-size: 1rem;
  border-left: 4px solid var(--orange);
  padding-left: 0.5rem;
}

.setting-jadwal-wrap .schedule-grid table {
  min-width: 600px;
  font-size: 0.78rem;
}

.setting-jadwal-wrap .cell-filled {
  min-width: 80px;
  padding: 4px;
}

.cell-add {
  background: #fff7ed;
  border: 2px dashed var(--orange);
  cursor: pointer;
  text-align: center;
  color: var(--orange-dark);
  font-weight: 700;
  font-size: 1.1rem;
  vertical-align: middle;
}

.cell-add:hover {
  background: var(--orange);
  color: white;
}

@media (max-width: 768px) {
  .layout { flex-direction: column; }
  .sidebar { width: 100%; display: flex; overflow-x: auto; padding: 0.5rem; }
  .nav-btn { white-space: nowrap; border-left: none; border-bottom: 3px solid transparent; }
  .nav-btn.active { border-bottom-color: var(--orange); border-left: none; }
}