/* === Apple-inspired Design System === */
:root {
  --bg-primary: #f5f5f7;
  --bg-secondary: #ffffff;
  --bg-sidebar: #1d1d1f;
  --text-primary: #1d1d1f;
  --text-secondary: #86868b;
  --text-sidebar: #f5f5f7;
  --text-sidebar-muted: #86868b;
  --border: #d2d2d7;
  --accent: #0071e3;
  --accent-hover: #0077ed;
  --danger: #ff3b30;
  --warning: #ff9500;
  --success: #34c759;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.1);
  --transition: 0.2s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'PingFang SC', 'Helvetica Neue', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  display: flex;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* === Sidebar === */
.sidebar {
  width: 220px;
  background: var(--bg-sidebar);
  color: var(--text-sidebar);
  padding: 24px 0;
  position: fixed;
  top: 0; left: 0; bottom: 0;
  display: flex;
  flex-direction: column;
  z-index: 100;
}

.sidebar-logo {
  padding: 0 20px 24px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.3px;
  color: #fff;
}

.sidebar-nav { flex: 1; }

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 20px;
  color: var(--text-sidebar-muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 450;
  transition: all var(--transition);
  border-left: 3px solid transparent;
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
  color: #fff;
  background: rgba(255,255,255,0.08);
  border-left-color: var(--accent);
}

.sidebar-nav a .nav-icon { font-size: 17px; width: 24px; text-align: center; }

/* === Main Content === */
.main {
  margin-left: 220px;
  flex: 1;
  padding: 28px 32px;
  max-width: calc(100vw - 220px);
  overflow-x: hidden;
}

/* === Header === */
.page-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.page-header h1 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.page-header .subtitle {
  font-size: 14px;
  color: var(--text-secondary);
  margin-top: 4px;
}

/* === Cards === */
.card {
  background: var(--bg-secondary);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.card-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* === Stats Row === */
.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--bg-secondary);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.stat-card .stat-value {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text-primary);
}

.stat-card .stat-label {
  font-size: 13px;
  color: var(--text-secondary);
  margin-top: 4px;
}

.stat-card .stat-change {
  font-size: 12px;
  margin-top: 6px;
}

.stat-change.up { color: var(--danger); }
.stat-change.down { color: var(--success); }

/* === Grid === */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 24px;
}

@media (max-width: 900px) { .grid-2 { grid-template-columns: 1fr; } }

.grid-full { margin-bottom: 24px; }

/* === Charts === */
.chart { width: 100%; height: 340px; }

/* === Tables === */
.table-wrap { overflow-x: auto; }

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
}

th {
  text-align: left;
  padding: 10px 12px;
  color: var(--text-secondary);
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.sort-link {
  color: var(--accent);
  text-decoration: none;
  cursor: pointer;
  transition: all var(--transition);
  padding: 4px 8px;
  border-radius: 6px;
  margin: -4px -8px;
  white-space: nowrap;
}
.sort-link:hover {
  color: #0056cc;
  background: rgba(0,113,227,0.08);
}

td {
  padding: 10px 12px;
  border-bottom: 1px solid #f0f0f0;
  vertical-align: middle;
}

tr:hover td { background: #fafafa; }

.amount { text-align: right; font-variant-numeric: tabular-nums; }

/* === Forms === */
.form-group { margin-bottom: 16px; }

.form-group label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

input[type="text"],
input[type="number"],
input[type="date"],
input[type="month"],
input[type="url"],
input[type="file"],
select,
textarea {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: inherit;
  color: var(--text-primary);
  background: #fff;
  transition: border-color var(--transition);
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0,113,227,0.12);
}

select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M6 8L1 3h10z' fill='%2386868b'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 32px; }

textarea { resize: vertical; min-height: 80px; }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 12px;
}

@media (max-width: 700px) { .form-row { grid-template-columns: 1fr; } }

.form-inline {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 18px;
  border-radius: 20px;
  border: none;
  font-size: 14px;
  font-weight: 550;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover { background: var(--accent-hover); }

.btn-secondary {
  background: #e8e8ed;
  color: var(--text-primary);
}

.btn-secondary:hover { background: #dcdce0; }

.btn-danger {
  background: var(--danger);
  color: #fff;
}

.btn-danger:hover { opacity: 0.9; }

.btn-sm {
  padding: 5px 12px;
  font-size: 12px;
  border-radius: 16px;
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-primary);
}

.btn-outline:hover { border-color: var(--accent); color: var(--accent); }

/* === Badges / Tags === */
.badge {
  display: inline-block;
  padding: 3px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 550;
}

.badge-danger { background: #ffe5e5; color: var(--danger); }
.badge-warning { background: #fff3e0; color: #e65100; }
.badge-success { background: #e8f5e9; color: #2e7d32; }
.badge-info { background: #e3f2fd; color: #1565c0; }

/* === Progress Bar === */
.progress-bar {
  height: 6px;
  background: #e8e8ed;
  border-radius: 3px;
  overflow: hidden;
  margin-top: 6px;
}

.progress-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.4s ease;
}

.progress-fill.ok { background: var(--success); }
.progress-fill.warning { background: var(--warning); }
.progress-fill.danger { background: var(--danger); }

/* === Pagination === */
.pagination {
  display: flex;
  gap: 6px;
  justify-content: center;
  margin-top: 20px;
}

.pagination a, .pagination span {
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  text-decoration: none;
  border: 1px solid var(--border);
  color: var(--text-primary);
}

.pagination a:hover { background: var(--accent); color: #fff; border-color: var(--accent); }
.pagination .current { background: var(--accent); color: #fff; border-color: var(--accent); }

/* === Month Selector === */
.month-bar {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.month-btn {
  padding: 7px 16px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 13px;
  font-weight: 500;
  transition: all var(--transition);
}

.month-btn:hover,
.month-btn.active {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(0,113,227,0.06);
}

/* === Import Steps === */
.import-steps {
  display: flex;
  gap: 0;
  margin-bottom: 32px;
}

.import-step {
  flex: 1;
  text-align: center;
  padding: 12px;
  border-bottom: 3px solid var(--border);
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
}

.import-step.active {
  border-color: var(--accent);
  color: var(--accent);
}

.import-step.done {
  border-color: var(--success);
  color: var(--success);
}

/* === Upload Zone === */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  margin-bottom: 16px;
}

.upload-zone:hover {
  border-color: var(--accent);
  background: rgba(0,113,227,0.03);
}

.upload-zone.has-file {
  border-color: var(--success);
  border-style: solid;
  background: #f0fdf4;
}

.upload-zone .upload-icon { font-size: 32px; margin-bottom: 8px; }
.upload-zone .upload-text { font-size: 14px; color: var(--text-secondary); }
.upload-zone .upload-hint { font-size: 12px; color: var(--text-secondary); margin-top: 4px; }

/* === Alerts === */
.alert {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  margin-bottom: 16px;
}

.alert-error { background: #ffe5e5; color: #c62828; border: 1px solid #ffcdd2; }
.alert-success { background: #e8f5e9; color: #2e7d32; border: 1px solid #c8e6c9; }
.alert-info { background: #e3f2fd; color: #1565c0; border: 1px solid #bbdefb; }

/* === Insights === */
.insight-text {
  font-size: 14px;
  color: var(--text-primary);
  line-height: 2;
}

.insight-text b { color: var(--accent); }

/* === Toggle Switch === */
.toggle {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}

.toggle input { display: none; }

.toggle-slider {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: #d2d2d7;
  border-radius: 12px;
  cursor: pointer;
  transition: all var(--transition);
}

.toggle-slider::before {
  content: '';
  position: absolute;
  height: 20px; width: 20px;
  left: 2px; bottom: 2px;
  background: white;
  border-radius: 50%;
  transition: all var(--transition);
  box-shadow: 0 1px 3px rgba(0,0,0,0.15);
}

.toggle input:checked + .toggle-slider { background: var(--success); }
.toggle input:checked + .toggle-slider::before { transform: translateX(20px); }

/* === Tabs === */
.tabs {
  display: flex;
  gap: 0;
  border-bottom: 1px solid var(--border);
  margin-bottom: 20px;
}

.tab {
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all var(--transition);
  background: none;
  border-top: none;
  border-left: none;
  border-right: none;
}

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

/* === Empty State === */
.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--text-secondary);
}

.empty-state .empty-icon { font-size: 48px; margin-bottom: 12px; }
.empty-state h3 { font-size: 18px; color: var(--text-primary); margin-bottom: 8px; }
.empty-state p { font-size: 14px; margin-bottom: 20px; }

/* === Modal === */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.4);
  z-index: 200;
  justify-content: center;
  align-items: center;
}

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

.modal {
  background: #fff;
  border-radius: var(--radius);
  padding: 24px;
  width: 90%;
  max-width: 500px;
  box-shadow: var(--shadow-lg);
}

.modal h3 { font-size: 18px; margin-bottom: 16px; }

/* === Utility === */
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.mt-16 { margin-top: 16px; }
.mb-16 { margin-bottom: 16px; }
.mr-8 { margin-right: 8px; }
.text-right { text-align: right; }
.text-muted { color: var(--text-secondary); font-size: 13px; }
.font-mono { font-variant-numeric: tabular-nums; }
.tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 500;
  background: #f0f0f5;
  color: var(--text-secondary);
}