/* ========================================
   Budget Control Platform - Main Styles
   ======================================== */

/* --- CSS Variables / Theme --- */
:root {
  --bg-primary: #f8f9fa;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f1f3f5;
  --text-primary: #212529;
  --text-secondary: #495057;
  --text-muted: #868e96;
  --border-color: #dee2e6;
  --border-light: #e9ecef;

  --accent: #4263eb;
  --accent-hover: #364fc7;
  --accent-light: #edf2ff;

  --success: #2b8a3e;
  --success-bg: #ebfbee;
  --warning: #e67700;
  --warning-bg: #fff9db;
  --danger: #c92a2a;
  --danger-bg: #fff5f5;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);

  --sidebar-width: 240px;
  --header-height: 56px;

  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --transition: 0.2s ease;
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 15px; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
input, select, textarea, button { font-family: inherit; font-size: inherit; }

/* --- Login Screen --- */
.login-screen {
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}
.login-card {
  background: var(--bg-secondary); border-radius: var(--radius-lg);
  padding: 2.5rem; width: 100%; max-width: 400px;
  box-shadow: var(--shadow-lg); text-align: center;
}
.login-card h1 { font-size: 1.5rem; margin-bottom: 0.25rem; }
.login-card p { color: var(--text-muted); margin-bottom: 1.5rem; font-size: 0.9rem; }
.login-card .logo { font-size: 2.5rem; margin-bottom: 1rem; }

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

/* Sidebar */
.sidebar {
  width: var(--sidebar-width); background: var(--bg-secondary);
  border-right: 1px solid var(--border-color);
  display: flex; flex-direction: column;
  position: fixed; top: 0; left: 0; bottom: 0; z-index: 100;
  transition: transform var(--transition);
}
.sidebar-brand {
  padding: 1.25rem 1.25rem 1rem;
  border-bottom: 1px solid var(--border-light);
  display: flex; align-items: center; gap: 0.6rem;
  font-weight: 700; font-size: 1.1rem;
}
.sidebar-brand span.icon { font-size: 1.4rem; }
.sidebar-nav { flex: 1; padding: 0.75rem 0; overflow-y: auto; }
.sidebar-nav a {
  display: flex; align-items: center; gap: 0.75rem;
  padding: 0.6rem 1.25rem; color: var(--text-secondary);
  font-size: 0.9rem; font-weight: 500; border-radius: 0;
  transition: all var(--transition); text-decoration: none;
  border-left: 3px solid transparent;
}
.sidebar-nav a:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.sidebar-nav a.active {
  background: var(--accent-light); color: var(--accent);
  border-left-color: var(--accent); font-weight: 600;
}
.sidebar-nav a .nav-icon { font-size: 1.15rem; width: 1.5rem; text-align: center; }
.sidebar-footer {
  padding: 1rem 1.25rem; border-top: 1px solid var(--border-light);
  font-size: 0.8rem; color: var(--text-muted);
}

/* Main content */
.main-content {
  margin-left: var(--sidebar-width); flex: 1; min-height: 100vh;
  display: flex; flex-direction: column;
}

/* Page header */
.page-header {
  background: var(--bg-secondary); border-bottom: 1px solid var(--border-color);
  padding: 1.25rem 2rem; display: flex; align-items: center; justify-content: space-between;
  position: sticky; top: 0; z-index: 50;
}
.page-header h2 { font-size: 1.25rem; font-weight: 700; }
.page-header .header-actions { display: flex; gap: 0.5rem; align-items: center; }

/* Page body */
.page-body { padding: 1.5rem 2rem; flex: 1; }

/* --- Month Selector --- */
.month-selector {
  display: flex; align-items: center; gap: 0.75rem;
  background: var(--bg-secondary); border: 1px solid var(--border-color);
  border-radius: var(--radius-md); padding: 0.4rem 0.75rem;
}
.month-selector button {
  background: none; border: none; cursor: pointer;
  color: var(--text-secondary); font-size: 1rem; padding: 0.25rem;
  border-radius: var(--radius-sm); transition: all var(--transition);
}
.month-selector button:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.month-selector .month-label {
  font-weight: 600; font-size: 0.95rem; min-width: 140px; text-align: center;
}

/* --- Cards --- */
.card {
  background: var(--bg-secondary); border: 1px solid var(--border-color);
  border-radius: var(--radius-md); box-shadow: var(--shadow-sm);
}
.card-header {
  padding: 1rem 1.25rem; border-bottom: 1px solid var(--border-light);
  display: flex; align-items: center; justify-content: space-between;
  font-weight: 600;
}
.card-body { padding: 1.25rem; }

/* Summary cards grid */
.summary-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem; margin-bottom: 1.5rem;
}
.summary-card {
  background: var(--bg-secondary); border: 1px solid var(--border-color);
  border-radius: var(--radius-md); padding: 1.25rem; box-shadow: var(--shadow-sm);
  border-left: 4px solid var(--accent);
}
.summary-card .label { font-size: 0.8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; font-weight: 600; }
.summary-card .value { font-size: 1.5rem; font-weight: 700; margin-top: 0.25rem; }
.summary-card .sub { font-size: 0.85rem; color: var(--text-secondary); margin-top: 0.25rem; }

/* Category card on dashboard */
.category-budget-card {
  background: var(--bg-secondary); border: 1px solid var(--border-color);
  border-radius: var(--radius-md); box-shadow: var(--shadow-sm);
  margin-bottom: 1rem; overflow: hidden;
}
.category-budget-header {
  padding: 1rem 1.25rem; display: flex; align-items: center; justify-content: space-between;
  cursor: pointer; transition: background var(--transition);
}
.category-budget-header:hover { background: var(--bg-tertiary); }
.category-budget-header .cat-info {
  display: flex; align-items: center; gap: 0.75rem;
}
.cat-color-dot {
  width: 12px; height: 12px; border-radius: 50%; flex-shrink: 0;
}
.cat-name { font-weight: 600; }
.cat-amounts { display: flex; gap: 1.5rem; font-size: 0.85rem; color: var(--text-secondary); }
.cat-amounts .amt-label { font-size: 0.75rem; color: var(--text-muted); display: block; }

.category-budget-body { padding: 0 1.25rem 1.25rem; }

/* Budget item row */
.budget-item-row {
  display: flex; align-items: center; gap: 1rem;
  padding: 0.75rem 0; border-bottom: 1px solid var(--border-light);
}
.budget-item-row:last-child { border-bottom: none; }
.budget-item-name { min-width: 140px; font-weight: 500; font-size: 0.9rem; }
.budget-item-bar { flex: 1; }
.budget-item-amounts {
  display: flex; gap: 1rem; font-size: 0.8rem; color: var(--text-secondary); min-width: 280px; justify-content: flex-end;
}

/* Progress bar */
.progress-bar {
  background: var(--bg-tertiary); border-radius: 100px; height: 8px;
  overflow: hidden; position: relative;
}
.progress-fill {
  height: 100%; border-radius: 100px; transition: width 0.4s ease;
  min-width: 2px;
}
.progress-fill.green { background: var(--success); }
.progress-fill.orange { background: var(--warning); }
.progress-fill.red { background: var(--danger); }

/* --- Buttons --- */
.btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.5rem 1rem; border: 1px solid transparent;
  border-radius: var(--radius-sm); cursor: pointer; font-weight: 500;
  font-size: 0.875rem; transition: all var(--transition);
  text-decoration: none; white-space: nowrap;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary { background: var(--bg-tertiary); color: var(--text-primary); border-color: var(--border-color); }
.btn-secondary:hover { background: var(--border-light); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #b52525; }
.btn-ghost { background: transparent; color: var(--text-secondary); }
.btn-ghost:hover { background: var(--bg-tertiary); color: var(--text-primary); }
.btn-sm { padding: 0.3rem 0.7rem; font-size: 0.8rem; }
.btn-icon { padding: 0.4rem; border-radius: var(--radius-sm); }
.btn[disabled] { opacity: 0.5; cursor: not-allowed; }

/* --- Forms --- */
.form-group { margin-bottom: 1rem; }
.form-label {
  display: block; font-size: 0.85rem; font-weight: 600;
  color: var(--text-secondary); margin-bottom: 0.35rem;
}
.form-input, .form-select {
  width: 100%; padding: 0.55rem 0.75rem;
  border: 1px solid var(--border-color); border-radius: var(--radius-sm);
  background: var(--bg-secondary); color: var(--text-primary);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.form-input:focus, .form-select:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(66, 99, 235, 0.12);
}
.form-input::placeholder { color: var(--text-muted); }
.form-row { display: flex; gap: 1rem; }
.form-row .form-group { flex: 1; }
.form-color { width: 40px; height: 36px; padding: 2px; border: 1px solid var(--border-color); border-radius: var(--radius-sm); cursor: pointer; }

/* --- Tables --- */
.data-table { width: 100%; border-collapse: collapse; }
.data-table th {
  text-align: left; font-size: 0.8rem; font-weight: 600;
  color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px;
  padding: 0.75rem 1rem; border-bottom: 2px solid var(--border-color);
}
.data-table td {
  padding: 0.75rem 1rem; border-bottom: 1px solid var(--border-light);
  font-size: 0.9rem; vertical-align: middle;
}
.data-table tr:hover td { background: var(--bg-tertiary); }
.data-table .actions { display: flex; gap: 0.25rem; }

/* --- Modals --- */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.4);
  display: flex; align-items: center; justify-content: center;
  z-index: 1000; padding: 1rem;
  animation: fadeIn 0.15s ease;
}
.modal-content {
  background: var(--bg-secondary); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); width: 100%; max-width: 500px;
  max-height: 90vh; overflow-y: auto;
  animation: slideUp 0.2s ease;
}
.modal-header {
  padding: 1.25rem 1.5rem; border-bottom: 1px solid var(--border-light);
  display: flex; align-items: center; justify-content: space-between;
}
.modal-header h3 { font-size: 1.1rem; font-weight: 700; }
.modal-body { padding: 1.5rem; }
.modal-footer {
  padding: 1rem 1.5rem; border-top: 1px solid var(--border-light);
  display: flex; justify-content: flex-end; gap: 0.5rem;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

/* --- Toast Notifications --- */
.toast-container {
  position: fixed; top: 1rem; right: 1rem; z-index: 2000;
  display: flex; flex-direction: column; gap: 0.5rem;
}
.toast {
  padding: 0.75rem 1rem; border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md); font-size: 0.875rem; font-weight: 500;
  animation: slideIn 0.3s ease; display: flex; align-items: center; gap: 0.5rem;
  max-width: 380px;
}
.toast-success { background: var(--success-bg); color: var(--success); border: 1px solid var(--success); }
.toast-error { background: var(--danger-bg); color: var(--danger); border: 1px solid var(--danger); }
.toast-info { background: var(--accent-light); color: var(--accent); border: 1px solid var(--accent); }
@keyframes slideIn { from { opacity: 0; transform: translateX(100%); } to { opacity: 1; transform: translateX(0); } }

/* --- Tags / Badges --- */
.badge {
  display: inline-flex; align-items: center; padding: 0.15rem 0.5rem;
  border-radius: 100px; font-size: 0.75rem; font-weight: 600;
}
.badge-green { background: var(--success-bg); color: var(--success); }
.badge-orange { background: var(--warning-bg); color: var(--warning); }
.badge-red { background: var(--danger-bg); color: var(--danger); }
.badge-blue { background: var(--accent-light); color: var(--accent); }
.badge-gray { background: var(--bg-tertiary); color: var(--text-muted); }

/* Event type badge */
.event-badge {
  display: inline-flex; padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm); font-size: 0.75rem;
  font-family: var(--font-mono); font-weight: 600;
}

/* --- Event History --- */
.event-item {
  border: 1px solid var(--border-light); border-radius: var(--radius-sm);
  margin-bottom: 0.5rem; overflow: hidden; transition: all var(--transition);
}
.event-item:hover { border-color: var(--border-color); }
.event-item-header {
  padding: 0.75rem 1rem; display: flex; align-items: center;
  justify-content: space-between; cursor: pointer;
  transition: background var(--transition);
}
.event-item-header:hover { background: var(--bg-tertiary); }
.event-item-body {
  padding: 0.75rem 1rem; background: var(--bg-tertiary);
  border-top: 1px solid var(--border-light);
}
.event-item-body pre {
  font-family: var(--font-mono); font-size: 0.8rem;
  white-space: pre-wrap; word-break: break-all;
  background: var(--bg-secondary); padding: 0.75rem; border-radius: var(--radius-sm);
  border: 1px solid var(--border-light);
}

/* --- Empty State --- */
.empty-state {
  text-align: center; padding: 3rem 1rem; color: var(--text-muted);
}
.empty-state .icon { font-size: 3rem; margin-bottom: 1rem; }
.empty-state p { font-size: 0.95rem; margin-bottom: 1rem; }

/* --- Filters Bar --- */
.filters-bar {
  display: flex; flex-wrap: wrap; gap: 0.75rem; align-items: center;
  padding: 1rem 0; margin-bottom: 1rem;
}
.filters-bar .form-input, .filters-bar .form-select {
  width: auto; min-width: 150px;
}

/* --- Color Dot --- */
.color-dot {
  display: inline-block; width: 10px; height: 10px;
  border-radius: 50%; vertical-align: middle; margin-right: 0.4rem;
}

/* --- Misc Utilities --- */
.text-right { text-align: right; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.font-mono { font-family: var(--font-mono); }
.font-bold { font-weight: 700; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.gap-1 { gap: 0.5rem; }
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.flex-wrap { flex-wrap: wrap; }
.hidden { display: none !important; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* Over budget row highlight */
.over-budget { background: var(--danger-bg) !important; }
.unbudgeted { background: var(--warning-bg) !important; }

/* Warning flag */
.flag {
  display: inline-flex; align-items: center; gap: 0.25rem;
  font-size: 0.75rem; font-weight: 600; padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
}
.flag-over { background: var(--danger-bg); color: var(--danger); }
.flag-unbudgeted { background: var(--warning-bg); color: var(--warning); }

/* --- Mobile hamburger --- */
.mobile-toggle {
  display: none; background: none; border: none; font-size: 1.5rem;
  cursor: pointer; color: var(--text-primary); padding: 0.25rem;
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; }
  .mobile-toggle { display: block; }
  .page-body { padding: 1rem; }
  .page-header { padding: 1rem; }
  .form-row { flex-direction: column; }
  .summary-grid { grid-template-columns: 1fr 1fr; }
  .budget-item-row { flex-wrap: wrap; }
  .budget-item-amounts { min-width: 100%; justify-content: flex-start; margin-top: 0.25rem; }
  .cat-amounts { flex-wrap: wrap; gap: 0.75rem; }
  .filters-bar { flex-direction: column; align-items: stretch; }
  .filters-bar .form-input, .filters-bar .form-select { width: 100%; min-width: 0; }
}
@media (max-width: 480px) {
  .summary-grid { grid-template-columns: 1fr; }
}

/* Loading spinner */
.spinner {
  display: inline-block; width: 20px; height: 20px;
  border: 2px solid var(--border-color);
  border-top-color: var(--accent); border-radius: 50%;
  animation: spin 0.6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Sidebar overlay for mobile */
.sidebar-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.3);
  z-index: 99; display: none;
}
.sidebar-overlay.show { display: block; }