/* ==========================================================================
   CS Accounts - Mobile-First Responsive Design System & CSS Stylesheet
   ========================================================================== */

:root {
  --primary: #1e3a8a;       /* Deep Academic Navy */
  --primary-light: #3b82f6;
  --secondary: #0d9488;     /* Emerald Teal */
  --accent: #d97706;        /* Golden Amber */
  --success: #15803d;       /* Vibrant Emerald */
  --danger: #b91c1c;        /* Crimson Red */
  --warning: #c2410c;
  --bg-main: #f8fafc;       /* Clean Light Gray */
  --bg-card: #ffffff;
  --bg-header: #0f172a;     /* Midnight Blue */
  --text-main: #1e293b;
  --text-muted: #64748b;
  --text-inverse: #ffffff;
  --border-color: #e2e8f0;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --font-main: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

[data-theme="dark"] {
  --bg-main: #0f172a;
  --bg-card: #1e293b;
  --bg-header: #020617;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border-color: #334155;
  --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.5);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.5);
}

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

body {
  font-family: var(--font-main);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.5;
  padding-bottom: 80px; /* Space for Mobile Bottom Nav */
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--primary-light);
  text-decoration: none;
}

/* Header & Top Bar */
.app-header {
  background: var(--bg-header);
  color: #fff;
  padding: 12px 16px;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-md);
}

.header-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand-section {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-logo {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #3b82f6, #1d4ed8);
  color: white;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
  box-shadow: 0 2px 8px rgba(59, 130, 246, 0.4);
}

.brand-titles h1 {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #ffffff;
}

.brand-titles p {
  font-size: 0.72rem;
  color: #94a3b8;
}

/* Role Selector Dropdown in Header */
.role-switcher-badge {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: #fff;
  padding: 6px 10px;
  border-radius: 20px;
  font-size: 0.78rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}

.role-switcher-badge select {
  background: transparent;
  border: none;
  color: #fff;
  font-weight: 600;
  font-size: 0.78rem;
  outline: none;
  cursor: pointer;
}

.role-switcher-badge select option {
  background: #1e293b;
  color: #fff;
}

/* Container & Layout */
.app-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px;
}

/* Financial Dashboard Summary Grid */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
  margin-bottom: 20px;
}

.kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  position: relative;
  overflow: hidden;
}

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

.kpi-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
}

.kpi-card.income::before { background: var(--success); }
.kpi-card.expense::before { background: var(--danger); }
.kpi-card.balance::before { background: var(--primary-light); }
.kpi-card.loan::before { background: var(--warning); }
.kpi-card.reimb::before { background: var(--secondary); }

.kpi-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 6px;
}

.kpi-value {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--text-main);
}

.kpi-subtitle {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 4px;
}

/* Quick Action Bar / Floating Launcher */
.quick-actions {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  margin-bottom: 20px;
  scrollbar-width: none;
}

.quick-actions::-webkit-scrollbar {
  display: none;
}

.btn-action {
  white-space: nowrap;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 10px 16px;
  border-radius: 20px;
  font-size: 0.82rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  transition: background 0.2s, border-color 0.2s;
}

.btn-action:hover, .btn-action.active {
  background: var(--primary);
  color: #ffffff;
  border-color: var(--primary);
}

/* Tables & Digital Cash Book */
.table-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  margin-bottom: 20px;
}

.table-header {
  padding: 16px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
}

.table-title {
  font-size: 1.05rem;
  font-weight: 700;
}

.table-responsive {
  width: 100%;
  overflow-x: auto;
}

.table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.86rem;
}

.table th {
  background: rgba(0, 0, 0, 0.02);
  padding: 12px 14px;
  font-weight: 700;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-color);
  text-transform: uppercase;
  font-size: 0.72rem;
  letter-spacing: 0.05em;
}

.table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border-color);
}

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

.table tr:hover {
  background: rgba(0, 0, 0, 0.015);
}

/* Status Badges */
.badge {
  display: inline-block;
  padding: 4px 8px;
  border-radius: 12px;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
}

.badge-approved { background: #dcfce7; color: #15803d; }
.badge-pending { background: #fef3c7; color: #b45309; }
.badge-rejected { background: #fee2e2; color: #b91c1c; }
.badge-draft { background: #f1f5f9; color: #475569; }
.badge-income { background: #dcfce7; color: #166534; }
.badge-expense { background: #fee2e2; color: #991b1b; }
.badge-loan { background: #ffedd5; color: #c2410c; }

/* Mobile Bottom Navigation Bar */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--bg-card);
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: space-around;
  align-items: center;
  height: 64px;
  z-index: 1000;
  box-shadow: 0 -4px 12px rgba(0,0,0,0.05);
}

.nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.68rem;
  font-weight: 600;
  flex: 1;
  height: 100%;
  transition: color 0.2s;
}

.nav-item.active {
  color: var(--primary-light);
}

.nav-icon {
  font-size: 1.25rem;
  margin-bottom: 2px;
}

/* Central Floating Add Button (FAB) */
.fab-add-btn {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, #2563eb, #1d4ed8);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.4);
  margin-top: -24px;
  border: 3px solid var(--bg-card);
  cursor: pointer;
}

/* Form Controls & Modals */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 6px;
  color: var(--text-main);
}

.form-control {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  background: var(--bg-card);
  color: var(--text-main);
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.2s;
}

.form-control:focus {
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

/* Modal Window styling */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  padding: 16px;
}

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

.modal-container {
  background: var(--bg-card);
  border-radius: var(--radius-lg);
  max-width: 550px;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
  animation: modalSlideUp 0.25s ease-out;
}

@keyframes modalSlideUp {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

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

.modal-title {
  font-size: 1.1rem;
  font-weight: 700;
}

.modal-close {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  color: var(--text-muted);
  cursor: pointer;
}

.modal-body {
  padding: 20px;
}

.modal-footer {
  padding: 14px 20px;
  border-top: 1px solid var(--border-color);
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

.btn {
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 600;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.btn-primary { background: var(--primary-light); color: white; }
.btn-success { background: var(--success); color: white; }
.btn-danger { background: var(--danger); color: white; }
.btn-secondary { background: #e2e8f0; color: #334155; }

/* Responsive adjustments */
@media (min-width: 768px) {
  .app-container { padding: 24px; }
  .kpi-grid { grid-template-columns: repeat(4, 1fr); }
}