/* ============================================================
   BillFlow SaaS - Custom Theme
   Professional dark sidebar + light content SaaS design
   ============================================================ */

/* ---- CSS Variables ---- */
:root {
  --sidebar-width: 260px;
  --sidebar-collapsed: 70px;
  --topbar-height: 60px;

  /* Premium Color Palette */
  --primary: #4f46e5;
  --primary-light: #818cf8;
  --primary-dark: #3730a3;
  --primary-bg: rgba(79, 70, 229, 0.08);

  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.08);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.08);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.08);
  --info: #06b6d4;
  --info-bg: rgba(6, 182, 212, 0.08);

  /* Sidebar */
  --sidebar-bg: #0f172a;
  --sidebar-text: #94a3b8;
  --sidebar-hover: rgba(255, 255, 255, 0.06);
  --sidebar-active: rgba(79, 70, 229, 0.2);
  --sidebar-active-text: #818cf8;
  --sidebar-border: rgba(255, 255, 255, 0.06);

  /* Content */
  --body-bg: #f1f5f9;
  --card-bg: #ffffff;
  --text-primary: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --border-color: #e2e8f0;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md:
    0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg:
    0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.05);

  --radius: 8px;
  --radius-lg: 12px;
  --transition: all 0.25s ease;
}

/* ---- Global Resets ---- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  font-family:
    "Segoe UI",
    system-ui,
    -apple-system,
    sans-serif;
  background: var(--body-bg);
  color: var(--text-primary);
  margin: 0;
  padding: 0;
  font-size: 14px;
  line-height: 1.5;
  overflow-x: hidden;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: var(--transition);
}
a:hover {
  color: var(--primary-dark);
}

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

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

/* ---- Sidebar ---- */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--sidebar-bg);
  display: flex;
  flex-direction: column;
  z-index: 1040;
  transition: var(--transition);
  overflow: hidden;
}

.sidebar-header {
  height: var(--topbar-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  border-bottom: 1px solid var(--sidebar-border);
  flex-shrink: 0;
}

.sidebar-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.5px;
}

.sidebar-logo i {
  font-size: 22px;
  color: var(--primary-light);
}

.sidebar-close {
  color: var(--sidebar-text);
  display: none;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 12px 0;
}

.sidebar-nav::-webkit-scrollbar {
  width: 4px;
}
.sidebar-nav::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
}

.nav-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-category {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  padding: 16px 20px 6px;
  opacity: 0.6;
}

.nav-item .nav-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 20px;
  color: var(--sidebar-text);
  font-size: 13.5px;
  font-weight: 500;
  border-radius: 0;
  margin: 1px 8px;
  border-radius: var(--radius);
  transition: var(--transition);
}

.nav-item .nav-link i {
  width: 20px;
  text-align: center;
  font-size: 15px;
  opacity: 0.7;
}

.nav-item .nav-link:hover {
  background: var(--sidebar-hover);
  color: #e2e8f0;
}

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

.nav-item .nav-link.active i {
  opacity: 1;
}

.sidebar-footer {
  padding: 12px 20px;
  border-top: 1px solid var(--sidebar-border);
  text-align: center;
  flex-shrink: 0;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1035;
}

/* ---- Top Navbar ---- */
.top-navbar {
  height: var(--topbar-height);
  background: var(--card-bg);
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 1020;
  box-shadow: var(--shadow-sm);
}

.page-title {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
}

.sidebar-toggle {
  color: var(--text-primary);
  font-size: 18px;
  padding: 0;
}

.user-menu {
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
}

.user-avatar {
  width: 34px;
  height: 34px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 14px;
}

/* ---- Page Content ---- */
.page-content {
  padding: 24px;
  min-height: calc(100vh - var(--topbar-height));
}

/* ---- Dashboard Cards ---- */
.stat-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 20px;
  border: 1px solid var(--border-color);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  border-radius: 4px 0 0 4px;
}

.stat-card.primary::before {
  background: var(--primary);
}
.stat-card.success::before {
  background: var(--success);
}
.stat-card.warning::before {
  background: var(--warning);
}
.stat-card.danger::before {
  background: var(--danger);
}
.stat-card.info::before {
  background: var(--info);
}

.stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.stat-card .stat-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
}

.stat-card.primary .stat-icon {
  background: var(--primary-bg);
  color: var(--primary);
}
.stat-card.success .stat-icon {
  background: var(--success-bg);
  color: var(--success);
}
.stat-card.warning .stat-icon {
  background: var(--warning-bg);
  color: var(--warning);
}
.stat-card.danger .stat-icon {
  background: var(--danger-bg);
  color: var(--danger);
}
.stat-card.info .stat-icon {
  background: var(--info-bg);
  color: var(--info);
}

.stat-card .stat-value {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 8px 0 2px;
}

.stat-card .stat-label {
  font-size: 12.5px;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ---- Cards ---- */
.card {
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  background: var(--card-bg);
}

.card-header {
  background: transparent;
  border-bottom: 1px solid var(--border-color);
  padding: 16px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-header h5,
.card-header h6 {
  margin: 0;
  font-weight: 600;
  font-size: 15px;
}

.card-body {
  padding: 20px;
}

/* ---- Tables ---- */
.table {
  font-size: 13.5px;
  margin-bottom: 0;
}

.table th {
  font-weight: 600;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-secondary);
  background: var(--body-bg);
  border-bottom: 2px solid var(--border-color);
  padding: 10px 14px;
  white-space: nowrap;
}

.table td {
  padding: 10px 14px;
  vertical-align: middle;
  border-color: var(--border-color);
}

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

/* ---- Buttons ---- */
.btn {
  font-size: 13px;
  font-weight: 500;
  border-radius: var(--radius);
  padding: 7px 16px;
  transition: var(--transition);
}

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

.btn-primary:hover {
  background: var(--primary-dark);
  border-color: var(--primary-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.btn-sm {
  padding: 4px 10px;
  font-size: 12px;
}

.btn-icon {
  width: 32px;
  height: 32px;
  padding: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
}

/* ---- Forms ---- */
.form-control,
.form-select {
  font-size: 13.5px;
  border-radius: var(--radius);
  border-color: var(--border-color);
  padding: 8px 12px;
  transition: var(--transition);
}

.form-control:focus,
.form-select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 4px;
}

/* ---- Badges ---- */
.badge {
  font-weight: 500;
  font-size: 11.5px;
  padding: 4px 10px;
  border-radius: 50px;
}

.badge-status {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.badge-status::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  display: inline-block;
}

.badge-active {
  background: var(--success-bg);
  color: var(--success);
}
.badge-active::before {
  background: var(--success);
}
.badge-inactive {
  background: var(--danger-bg);
  color: var(--danger);
}
.badge-inactive::before {
  background: var(--danger);
}
.badge-pending {
  background: var(--warning-bg);
  color: var(--warning);
}
.badge-pending::before {
  background: var(--warning);
}
.badge-partial {
  background: rgba(245, 158, 11, 0.15);
  color: var(--warning);
}
.badge-partial::before {
  background: var(--warning);
}
.badge-expired {
  background: var(--text-muted);
  color: #fff;
}

/* ---- Modals ---- */
.modal-content {
  border: none;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.modal-header {
  border-bottom: 1px solid var(--border-color);
  padding: 16px 20px;
}

.modal-title {
  font-size: 16px;
  font-weight: 600;
}

.modal-body {
  padding: 20px;
}
.modal-footer {
  border-top: 1px solid var(--border-color);
  padding: 12px 20px;
}

/* ---- Alerts ---- */
.alert {
  border-radius: var(--radius);
  font-size: 13.5px;
  border: none;
}

/* ---- Empty State ---- */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-muted);
}
.empty-state i {
  font-size: 48px;
  margin-bottom: 16px;
  opacity: 0.4;
}
.empty-state h5 {
  color: var(--text-secondary);
  margin-bottom: 8px;
}

/* ---- Action Buttons ---- */
.action-btns {
  display: flex;
  gap: 4px;
  align-items: center;
}

.action-btns .btn {
  padding: 4px 8px;
  font-size: 12px;
}

/* ---- Invoice Specific ---- */
.billing-item-row td {
  vertical-align: middle;
}
.billing-item-row .form-control {
  padding: 4px 8px;
  font-size: 13px;
}
.billing-summary {
  background: var(--body-bg);
  border-radius: var(--radius-lg);
  padding: 20px;
}
.billing-summary .row {
  margin-bottom: 8px;
}
.billing-total {
  font-size: 20px;
  font-weight: 700;
  color: var(--primary);
}

/* ---- Chart Container ---- */
.chart-container {
  position: relative;
  height: 300px;
}

/* ---- Responsive ---- */
@media (max-width: 991.98px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.show {
    transform: translateX(0);
  }
  .sidebar-close {
    display: block;
  }
  .sidebar-overlay.show {
    display: block;
  }
  .main-content {
    margin-left: 0;
  }
}

@media (max-width: 575.98px) {
  .page-content {
    padding: 16px;
  }
  .top-navbar {
    padding: 0 16px;
  }
  .stat-card .stat-value {
    font-size: 20px;
  }
}

/* ---- Login Page ---- */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
  padding: 20px;
}

.login-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
  width: 100%;
  max-width: 420px;
  overflow: hidden;
}

.login-header {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  padding: 32px;
  text-align: center;
  color: #fff;
}

.login-header h3 {
  font-weight: 700;
  margin: 12px 0 4px;
  font-size: 22px;
}

.login-header p {
  opacity: 0.85;
  margin: 0;
  font-size: 14px;
}

.login-header .login-icon {
  width: 56px;
  height: 56px;
  background: rgba(255, 255, 255, 0.15);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
}

.login-body {
  padding: 32px;
}

.login-body .form-control {
  padding: 10px 14px;
  font-size: 14px;
}

.login-body .btn-primary {
  padding: 10px;
  font-size: 15px;
  font-weight: 600;
  width: 100%;
}

/* ---- Animations ---- */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.stat-card,
.card {
  animation: fadeInUp 0.3s ease forwards;
}
.stat-card:nth-child(2) {
  animation-delay: 0.05s;
}
.stat-card:nth-child(3) {
  animation-delay: 0.1s;
}
.stat-card:nth-child(4) {
  animation-delay: 0.15s;
}

/* ---- Scrollbar ---- */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: #cbd5e1;
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: #94a3b8;
}