/* ============================================= */
/* GESTÃO AEC - Modern Design System v2         */
/* Clean, Fast, Intuitive                        */
/* ============================================= */

:root {
  /* Brand Colors */
  --brand: #6366f1;
  --brand-dark: #4f46e5;
  --brand-light: #e0e7ff;
  --brand-50: #eef2ff;
  
  --admin: #14b8a6;
  --admin-dark: #0d9488;
  --admin-light: #ccfbf1;
  
  /* Status */
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --info: #3b82f6;
  
  /* Neutral */
  --white: #ffffff;
  --black: #0f172a;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  
  /* Semantic */
  --bg: var(--gray-50);
  --surface: var(--white);
  --border: var(--gray-200);
  --text: var(--gray-800);
  --text-light: var(--gray-500);
  --text-muted: var(--gray-400);
  
  /* Sizing */
  --radius: 8px;
  --radius-lg: 12px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-lg: 0 4px 12px rgba(0,0,0,0.1);
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 15px; scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
}

/* ==================== LAYOUT ==================== */
.app-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: 100vh;
}

.app-sidebar {
  background: var(--surface);
  border-right: 1px solid var(--border);
  padding: 1.5rem 1rem;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.app-main {
  padding: 2rem;
  max-width: 1200px;
}

@media (max-width: 768px) {
  .app-layout { grid-template-columns: 1fr; }
  .app-sidebar { display: none; }
  .app-main { padding: 1rem; }
}

/* ==================== SIDEBAR ==================== */
.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem;
  margin-bottom: 2rem;
}

.sidebar-brand-icon {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--admin), var(--admin-dark));
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.sidebar-brand h1 {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

.sidebar-brand small {
  font-size: 0.75rem;
  color: var(--text-light);
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-light);
  text-decoration: none;
  cursor: pointer;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  transition: all 0.15s ease;
}

.nav-item:hover {
  background: var(--gray-100);
  color: var(--text);
}

.nav-item.active {
  background: var(--admin-light);
  color: var(--admin-dark);
  font-weight: 600;
}

.nav-item svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.nav-divider {
  height: 1px;
  background: var(--border);
  margin: 1rem 0;
}

/* ==================== HEADER ==================== */
.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 2rem;
}

.page-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

.page-subtitle {
  font-size: 0.9rem;
  color: var(--text-light);
  margin-top: 0.25rem;
}

/* ==================== CARDS ==================== */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1rem;
}

/* ==================== STATS ==================== */
.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.stat-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.stat-icon.blue { background: #dbeafe; color: #2563eb; }
.stat-icon.purple { background: #ede9fe; color: #7c3aed; }
.stat-icon.green { background: #dcfce7; color: #16a34a; }
.stat-icon.orange { background: #ffedd5; color: #ea580c; }

.stat-content { flex: 1; }

.stat-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-light);
  margin-top: 0.25rem;
}

/* ==================== BUTTONS ==================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
  white-space: nowrap;
}

.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary {
  background: var(--brand);
  color: white;
}
.btn-primary:hover:not(:disabled) { background: var(--brand-dark); }

.btn-admin {
  background: var(--admin);
  color: white;
}
.btn-admin:hover:not(:disabled) { background: var(--admin-dark); }

.btn-secondary {
  background: var(--white);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover:not(:disabled) { background: var(--gray-100); }

.btn-danger {
  background: var(--danger);
  color: white;
}
.btn-danger:hover:not(:disabled) { opacity: 0.9; }

.btn-ghost {
  background: transparent;
  color: var(--text-light);
}
.btn-ghost:hover:not(:disabled) { background: var(--gray-100); color: var(--text); }

.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.8rem; }
.btn-icon { padding: 0.5rem; }

/* ==================== FORMS ==================== */
.form-group {
  margin-bottom: 1rem;
}

.form-label {
  display: block;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-light);
  margin-bottom: 0.35rem;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  font-size: 0.9rem;
  color: var(--text);
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.15s, box-shadow 0.15s;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--brand);
  box-shadow: 0 0 0 3px var(--brand-light);
}

.form-textarea { resize: vertical; min-height: 100px; }

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
}

.form-inline {
  display: flex;
  gap: 0.75rem;
  align-items: flex-end;
}

/* ==================== TABLES ==================== */
.table-container {
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

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

.table th {
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-light);
  background: var(--gray-50);
}

.table tr:last-child td { border-bottom: none; }
.table tr:hover td { background: var(--gray-50); }

/* ==================== BADGES ==================== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.5rem;
  font-size: 0.7rem;
  font-weight: 600;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}

.badge-success { background: #dcfce7; color: #15803d; }
.badge-warning { background: #fef3c7; color: #a16207; }
.badge-danger { background: #fee2e2; color: #b91c1c; }
.badge-info { background: #dbeafe; color: #1d4ed8; }
.badge-gray { background: var(--gray-200); color: var(--gray-600); }

/* ==================== TABS ==================== */
.tabs {
  display: flex;
  gap: 0.25rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 1.5rem;
}

.tab {
  padding: 0.75rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-light);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: all 0.15s;
}

.tab:hover { color: var(--text); }
.tab.active { color: var(--admin); border-bottom-color: var(--admin); }

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ==================== MODALS ==================== */
.modal {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.modal.show { display: flex; }

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
}

.modal-content {
  position: relative;
  background: var(--surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-width: 500px;
  width: 100%;
  max-height: 90vh;
  overflow: auto;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
}

.modal-title { font-size: 1.1rem; font-weight: 600; }

.modal-body { padding: 1.25rem; }

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  border-top: 1px solid var(--border);
}

/* ==================== LOADING ==================== */
.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 1rem;
  background: rgba(255, 255, 255, 0.95);
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--gray-200);
  border-top-color: var(--admin);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* ==================== TOAST ==================== */
.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: 0.75rem 1.5rem;
  background: var(--gray-800);
  color: white;
  border-radius: var(--radius-lg);
  font-size: 0.875rem;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transition: all 0.3s ease;
  z-index: 10000;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ==================== UTILITIES ==================== */
.hidden { display: none !important; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.text-sm { font-size: 0.875rem; }
.text-xs { font-size: 0.75rem; }
.text-muted { color: var(--text-light); }
.text-center { text-align: center; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.w-full { width: 100%; }

/* ==================== SCHOOL MANAGEMENT ==================== */
.school-tree {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.school-group {
  border-bottom: 1px solid var(--border);
}

.school-group:last-child { border-bottom: none; }

.school-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem;
  background: var(--gray-50);
  cursor: pointer;
  transition: background 0.15s;
}

.school-header:hover { background: var(--gray-100); }

.school-name {
  font-weight: 600;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.school-name svg {
  width: 18px;
  height: 18px;
  color: var(--text-light);
  transition: transform 0.2s;
}

.school-group.open .school-name svg {
  transform: rotate(90deg);
}

.school-count {
  font-size: 0.75rem;
  color: var(--text-light);
  background: var(--gray-200);
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
}

.school-body {
  display: none;
  padding: 0.75rem 1rem 1rem 2.5rem;
}

.school-group.open .school-body { display: block; }

.class-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.class-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.65rem;
  font-size: 0.8rem;
  font-weight: 500;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
}

.class-tag .remove {
  width: 14px;
  height: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  cursor: pointer;
}

.class-tag .remove:hover { color: var(--danger); }

/* Add class form */
.add-class-form {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.add-class-form input {
  flex: 1;
  padding: 0.4rem 0.6rem;
  font-size: 0.8rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

/* ==================== EMPTY STATE ==================== */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-muted);
}

.empty-state svg {
  width: 48px;
  height: 48px;
  margin: 0 auto 1rem;
  opacity: 0.5;
}

/* ==================== QUICK ACTIONS ==================== */
.quick-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

/* ==================== SECTION ==================== */
.section {
  margin-bottom: 2rem;
}

.section-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 1rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 640px) {
  .page-header { flex-direction: column; align-items: flex-start; gap: 1rem; }
  .card { padding: 1rem; }
  .stat-card { flex-direction: column; text-align: center; }
  .form-row { grid-template-columns: 1fr; }
}