/* ─── CSS Variables / Theming ────────────────────────────── */
:root,
[data-theme="light"] {
  --bg: #f4f6f9;
  --bg-card: #ffffff;
  --bg-sidebar: #1a1d23;
  --bg-sidebar-hover: #2a2d35;
  --bg-input: #ffffff;
  --border: #e2e5ea;
  --text: #1a1d23;
  --text-secondary: #4a5060;
  --text-muted: #8a90a0;
  --text-sidebar: #c0c4d0;
  --text-sidebar-active: #ffffff;
  --primary: #4f6ef7;
  --primary-hover: #3b5ae0;
  --primary-light: #eef1fe;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.08), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
  --radius: 8px;
  --radius-lg: 12px;
}

[data-theme="dark"] {
  --bg: #0f1117;
  --bg-card: #1a1d27;
  --bg-sidebar: #0d0f14;
  --bg-sidebar-hover: #1a1d27;
  --bg-input: #1a1d27;
  --border: #2a2d3a;
  --text: #e8eaf0;
  --text-secondary: #a0a4b4;
  --text-muted: #606478;
  --text-sidebar: #808498;
  --text-sidebar-active: #ffffff;
  --primary: #6580fa;
  --primary-hover: #5070f0;
  --primary-light: #1a1f35;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.4);
}

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

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ─── Login Screen ───────────────────────────────────────── */
.login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #1a1d23 0%, #2d3148 100%);
}

.login-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  width: 100%;
  max-width: 400px;
  box-shadow: var(--shadow-lg);
}

.login-logo {
  text-align: center;
  margin-bottom: 2rem;
}

.login-logo svg {
  margin-bottom: 1rem;
}

.login-logo h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

.login-logo p {
  color: var(--text-muted);
  font-size: 0.875rem;
}

.form-group {
  margin-bottom: 1.25rem;
}

.form-group label {
  display: block;
  margin-bottom: 0.375rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.form-group input {
  width: 100%;
  padding: 0.625rem 0.875rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-input);
  color: var(--text);
  font-size: 0.9375rem;
  font-family: inherit;
  transition: border-color 0.2s;
}

.form-group input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 110, 247, 0.15);
}

.error-msg {
  background: rgba(239, 68, 68, 0.1);
  color: var(--danger);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  font-size: 0.875rem;
  margin-bottom: 1rem;
}

/* ─── Buttons ────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 1rem;
  border: none;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.15s ease;
}

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

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

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

.btn-outline:hover {
  background: var(--bg-card);
  border-color: var(--primary);
  color: var(--primary);
}

.btn-ghost {
  background: transparent;
  color: var(--text-sidebar);
}

.btn-ghost:hover {
  color: var(--text-sidebar-active);
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.8125rem;
}

.btn-full {
  width: 100%;
  justify-content: center;
  padding: 0.75rem;
}

/* ─── Dashboard Layout ───────────────────────────────────── */
.dashboard {
  display: flex;
  min-height: 100vh;
}

/* ─── Sidebar ────────────────────────────────────────────── */
.sidebar {
  width: 260px;
  background: var(--bg-sidebar);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 100;
  transition: transform 0.3s ease;
}

.sidebar-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1.25rem 1.25rem 1rem;
}

.sidebar-title {
  font-size: 1.125rem;
  font-weight: 700;
  color: #fff;
}

.sidebar-nav {
  flex: 1;
  padding: 0.5rem 0.75rem;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.625rem 0.875rem;
  border-radius: var(--radius);
  color: var(--text-sidebar);
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  transition: all 0.15s ease;
  margin-bottom: 0.25rem;
}

.nav-item:hover {
  background: var(--bg-sidebar-hover);
  color: var(--text-sidebar-active);
}

.nav-item.active {
  background: var(--primary);
  color: #fff;
}

.sidebar-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

/* ─── Main Content ───────────────────────────────────────── */
.main-content {
  flex: 1;
  margin-left: 260px;
  padding: 0;
  min-width: 0;
}

.top-bar {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 2rem;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 50;
}

.top-bar h2 {
  font-size: 1.25rem;
  font-weight: 600;
  flex: 1;
}

.top-bar-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.text-muted {
  color: var(--text-muted);
  font-size: 0.8125rem;
}

.sidebar-toggle {
  display: none;
  font-size: 1.25rem;
}

.section {
  padding: 2rem;
}

/* ─── Stat Cards ─────────────────────────────────────────── */
.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.stat-label {
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

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

/* ─── Cards & Charts ─────────────────────────────────────── */
.card {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}

.card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text);
}

.chart-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

/* ─── Tables ─────────────────────────────────────────────── */
.table-wrapper {
  overflow-x: auto;
}

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

.data-table th {
  text-align: left;
  padding: 0.75rem 1rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  font-size: 0.75rem;
  border-bottom: 2px solid var(--border);
  white-space: nowrap;
}

.data-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  color: var(--text-secondary);
}

.data-table tbody tr:hover {
  background: var(--primary-light);
}

.data-table tbody tr:last-child td {
  border-bottom: none;
}

/* ─── Empty State ────────────────────────────────────────── */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}

.empty-state h3 {
  font-size: 1.25rem;
  margin: 1rem 0 0.5rem;
  color: var(--text-secondary);
}

.empty-state p {
  max-width: 400px;
  margin: 0 auto;
  font-size: 0.9375rem;
}

/* ─── Responsive ─────────────────────────────────────────── */
@media (max-width: 1024px) {
  .chart-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-toggle {
    display: inline-flex;
  }

  .main-content {
    margin-left: 0;
  }

  .section {
    padding: 1rem;
  }

  .top-bar {
    padding: 0.75rem 1rem;
  }

  .stat-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .stat-grid {
    grid-template-columns: 1fr;
  }

  .login-card {
    margin: 1rem;
    padding: 1.5rem;
  }
}