/* ============================================================
   Academy Management Platform — Stylesheet
   Uses CSS variables for full light/dark theming.
   ============================================================ */

:root {
  --color-primary: #4f46e5;
  --color-primary-dark: #4338ca;
  --color-success: #16a34a;
  --color-danger: #dc2626;
  --color-warning: #d97706;
  --color-info: #0891b2;

  --bg-body: #f3f4f6;
  --bg-surface: #ffffff;
  --bg-surface-alt: #f9fafb;
  --bg-sidebar: #111827;
  --bg-hover: #f3f4f6;

  --text-primary: #111827;
  --text-secondary: #6b7280;
  --text-inverse: #f9fafb;

  --border-color: #e5e7eb;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.12);

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;

  --sidebar-width: 250px;
  --transition-fast: 150ms ease;
  --transition-theme: 250ms ease;
}

[data-theme="dark"] {
  --bg-body: #0f1420;
  --bg-surface: #171d2b;
  --bg-surface-alt: #1e2536;
  --bg-sidebar: #0b0f18;
  --bg-hover: #232b3d;

  --text-primary: #e5e7eb;
  --text-secondary: #9ca3af;
  --text-inverse: #111827;

  --border-color: #2a3346;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 10px 30px rgba(0,0,0,0.5);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg-body);
  color: var(--text-primary);
  font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, Roboto, Helvetica, Arial, sans-serif;
  transition: background var(--transition-theme), color var(--transition-theme);
}

a { color: inherit; text-decoration: none; }

button, input, select, textarea { font-family: inherit; }

/* ---------- Layout ---------- */
.app-shell { display: flex; min-height: 100vh; }

.sidebar {
  width: var(--sidebar-width);
  background: var(--bg-sidebar);
  color: var(--text-inverse);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  z-index: 40;
  transition: transform var(--transition-fast);
}

.sidebar-logo {
  padding: 22px 20px;
  display: flex;
  align-items: center;
  gap: 10px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.sidebar-logo img { height: 34px; width: auto; }
.sidebar-logo span { font-weight: 700; font-size: 16px; letter-spacing: 0.3px; }

.sidebar-branch {
  padding: 10px 20px;
  font-size: 12px;
  color: #9ca3af;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.sidebar-nav { flex: 1; padding: 12px 10px; overflow-y: auto; }
.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 14px;
  margin-bottom: 4px;
  border-radius: var(--radius-sm);
  color: #cbd5e1;
  font-size: 14px;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.sidebar-nav a:hover { background: rgba(255,255,255,0.08); color: #fff; }
.sidebar-nav a.active { background: var(--color-primary); color: #fff; }
.sidebar-nav a svg { flex-shrink: 0; }

.sidebar-footer { padding: 14px 20px; border-top: 1px solid rgba(255,255,255,0.08); }
.logout-link { color: #f87171 !important; }

.main-content {
  margin-left: var(--sidebar-width);
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.topbar {
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 30;
}
.topbar h1 { font-size: 19px; margin: 0; font-weight: 700; }
.topbar-actions { display: flex; align-items: center; gap: 14px; }

.menu-toggle { display: none; background: none; border: none; cursor: pointer; color: var(--text-primary); }

.theme-toggle {
  width: 42px; height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border-color);
  background: var(--bg-surface-alt);
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}
.theme-toggle:hover { background: var(--bg-hover); transform: rotate(15deg); }

.page-body { padding: 24px; flex: 1; }

/* ---------- Cards ---------- */
.card {
  background: var(--bg-surface);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--border-color);
  transition: box-shadow var(--transition-fast), transform var(--transition-fast), background var(--transition-theme);
  animation: fadeInUp 320ms ease both;
}
.card:hover { box-shadow: var(--shadow-md); }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 18px; margin-bottom: 22px; }
.stat-card { padding: 20px; display: flex; align-items: center; gap: 16px; }
.stat-icon {
  width: 48px; height: 48px; border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; color: #fff;
}
.stat-icon.income { background: var(--color-success); }
.stat-icon.expense { background: var(--color-danger); }
.stat-icon.profit { background: var(--color-primary); }
.stat-icon.students { background: var(--color-info); }
.stat-icon.cert-yes { background: var(--color-success); }
.stat-icon.cert-no { background: var(--color-warning); }
.stat-label { font-size: 13px; color: var(--text-secondary); margin-bottom: 4px; }
.stat-value { font-size: 20px; font-weight: 700; }

.chart-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr)); gap: 18px; margin-bottom: 22px; }
.chart-card { padding: 18px; }
.chart-card h3 { margin: 0 0 12px; font-size: 15px; }

/* ---------- Filters / toolbar ---------- */
.toolbar {
  display: flex; flex-wrap: wrap; gap: 10px; align-items: center;
  margin-bottom: 16px; justify-content: space-between;
}
.toolbar-filters { display: flex; flex-wrap: wrap; gap: 10px; }

.form-control, select.form-control {
  padding: 9px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: var(--bg-surface);
  color: var(--text-primary);
  font-size: 14px;
  transition: border-color var(--transition-fast);
}
.form-control:focus { outline: none; border-color: var(--color-primary); }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 9px 16px; border-radius: var(--radius-sm);
  border: 1px solid transparent; cursor: pointer;
  font-size: 14px; font-weight: 600;
  transition: background var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-dark); }
.btn-secondary { background: var(--bg-surface-alt); color: var(--text-primary); border-color: var(--border-color); }
.btn-secondary:hover { background: var(--bg-hover); }
.btn-danger { background: var(--color-danger); color: #fff; }
.btn-danger:hover { background: #b91c1c; }
.btn-success { background: var(--color-success); color: #fff; }
.btn-sm { padding: 6px 11px; font-size: 12.5px; }
.btn-icon { padding: 8px; width: 34px; height: 34px; justify-content: center; }

/* ---------- Tables ---------- */
.table-wrap { overflow-x: auto; border-radius: var(--radius-md); }
table.data-table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
table.data-table th, table.data-table td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--border-color); white-space: nowrap; }
table.data-table th { background: var(--bg-surface-alt); font-weight: 600; color: var(--text-secondary); position: sticky; top: 0; }
table.data-table tbody tr { transition: background var(--transition-fast); }
table.data-table tbody tr:hover { background: var(--bg-hover); }

.badge { display: inline-flex; align-items: center; gap: 5px; padding: 4px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; }
.badge-success { background: rgba(22,163,74,0.14); color: var(--color-success); }
.badge-danger { background: rgba(220,38,38,0.14); color: var(--color-danger); }

.cert-toggle { display: inline-flex; gap: 6px; }
.cert-btn {
  width: 30px; height: 30px; border-radius: 50%; border: 1px solid var(--border-color);
  background: var(--bg-surface-alt); cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: all var(--transition-fast); font-weight: 700;
}
.cert-btn.tick.active { background: var(--color-success); color: #fff; border-color: var(--color-success); }
.cert-btn.cross.active { background: var(--color-danger); color: #fff; border-color: var(--color-danger); }

/* ---------- Pagination ---------- */
.pagination { display: flex; gap: 6px; margin-top: 16px; justify-content: flex-end; flex-wrap: wrap; }
.pagination a, .pagination span {
  padding: 7px 12px; border-radius: var(--radius-sm); border: 1px solid var(--border-color);
  font-size: 13px; background: var(--bg-surface);
}
.pagination a:hover { background: var(--bg-hover); }
.pagination .active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }

/* ---------- Modals ---------- */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.5);
  display: none; align-items: flex-start; justify-content: center;
  z-index: 100; padding: 40px 16px; overflow-y: auto;
  animation: fadeIn var(--transition-fast);
}
.modal-overlay.open { display: flex; }
.modal-box {
  background: var(--bg-surface); border-radius: var(--radius-lg);
  width: 100%; max-width: 640px; box-shadow: var(--shadow-lg);
  animation: scaleIn 220ms ease;
}
.modal-header { padding: 18px 22px; border-bottom: 1px solid var(--border-color); display: flex; justify-content: space-between; align-items: center; }
.modal-header h3 { margin: 0; font-size: 17px; }
.modal-close { background: none; border: none; cursor: pointer; color: var(--text-secondary); font-size: 20px; line-height: 1; }
.modal-body { padding: 22px; max-height: 65vh; overflow-y: auto; }
.modal-footer { padding: 16px 22px; border-top: 1px solid var(--border-color); display: flex; justify-content: flex-end; gap: 10px; }

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.form-grid .full { grid-column: 1 / -1; }
.form-group label { display: block; font-size: 12.5px; font-weight: 600; margin-bottom: 6px; color: var(--text-secondary); }
.form-group .form-control { width: 100%; }

/* ---------- Upload boxes ---------- */
.upload-box {
  border: 2px dashed var(--border-color); border-radius: var(--radius-md);
  padding: 16px; text-align: center; background: var(--bg-surface-alt);
}
.upload-box img { max-width: 100%; max-height: 140px; border-radius: var(--radius-sm); margin-bottom: 10px; }
.upload-box-actions { display: flex; gap: 8px; justify-content: center; flex-wrap: wrap; margin-top: 8px; }

/* ---------- Notifications (toast) ---------- */
.toast-container { position: fixed; bottom: 20px; right: 20px; z-index: 200; display: flex; flex-direction: column; gap: 10px; }
.toast {
  padding: 12px 18px; border-radius: var(--radius-sm); color: #fff; font-size: 14px;
  box-shadow: var(--shadow-md); min-width: 220px; animation: slideIn 220ms ease;
}
.toast.success { background: var(--color-success); }
.toast.error { background: var(--color-danger); }
.toast.info { background: var(--color-info); }

/* ---------- Login page ---------- */
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: var(--bg-body); padding: 20px; }
.login-card { width: 100%; max-width: 400px; background: var(--bg-surface); border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); padding: 34px; animation: scaleIn 300ms ease; }
.login-card img.logo { height: 44px; display: block; margin: 0 auto 18px; }
.login-card h2 { text-align: center; margin: 0 0 6px; }
.login-card p.subtitle { text-align: center; color: var(--text-secondary); font-size: 13.5px; margin: 0 0 24px; }
.login-error { background: rgba(220,38,38,0.1); color: var(--color-danger); padding: 10px 14px; border-radius: var(--radius-sm); font-size: 13.5px; margin-bottom: 16px; }

/* ---------- Empty / loading states ---------- */
.empty-state { text-align: center; padding: 50px 20px; color: var(--text-secondary); }
.empty-state svg { margin-bottom: 12px; opacity: 0.5; }
.loading-spinner { display: inline-block; width: 18px; height: 18px; border: 2px solid rgba(0,0,0,0.15); border-top-color: var(--color-primary); border-radius: 50%; animation: spin 700ms linear infinite; }

/* ---------- Animations ---------- */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes scaleIn { from { opacity: 0; transform: scale(0.96); } to { opacity: 1; transform: scale(1); } }
@keyframes slideIn { from { opacity: 0; transform: translateX(20px); } to { opacity: 1; transform: translateX(0); } }
@keyframes spin { to { transform: rotate(360deg); } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; }
  .menu-toggle { display: flex; }
  .form-grid { grid-template-columns: 1fr; }
}

.sidebar-backdrop {
  display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.4); z-index: 39;
}
.sidebar-backdrop.open { display: block; }

.print-only { display: none; }
@media print {
  .sidebar, .topbar, .toolbar, .btn, .no-print { display: none !important; }
  .main-content { margin-left: 0 !important; }
  body { background: #fff; }
  .print-only { display: block; }
}