/* ============================================
   P2P-CARD Web Portal — Main Stylesheet
   ============================================ */

/* === CSS Variables === */
:root {
  --primary: #FFD700;
  --primary-dark: #E6C200;
  --primary-light: #FFE44D;
  --accent: #6C63FF;
  --accent-dark: #5A52E0;
  --success: #10B981;
  --danger: #EF4444;
  --warning: #F59E0B;
  --info: #3B82F6;

  --bg-dark: #000000;
  --bg-card: #0D0D0D;
  --bg-surface: #1A1A1A;
  --bg-elevated: #242424;
  --bg-input: #1E1E2E;

  --text-primary: #FFFFFF;
  --text-secondary: #A0A0A0;
  --text-muted: #666666;
  --text-on-primary: #000000;

  --border-color: #2A2A2A;
  --border-light: #333333;

  --sidebar-width: 260px;
  --sidebar-collapsed: 70px;
  --header-height: 70px;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;

  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 20px rgba(255,215,0,0.15);

  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: all 0.15s ease;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

img { max-width: 100%; height: auto; }

button {
  cursor: pointer;
  border: none;
  outline: none;
  font-family: inherit;
  font-size: inherit;
}

input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  outline: none;
}

/* === Scrollbar === */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ============================================
   SIDEBAR
   ============================================ */
.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background: var(--bg-card);
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
  z-index: 1000;
  transition: var(--transition);
}

.sidebar-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.sidebar-logo {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-on-primary);
  flex-shrink: 0;
}

.sidebar-brand {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  letter-spacing: -0.5px;
}

.sidebar-brand span {
  color: var(--text-primary);
  font-weight: 400;
}

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

.nav-section {
  padding: 0 1rem;
  margin-bottom: 0.5rem;
}

.nav-section-title {
  font-size: 0.65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--text-muted);
  padding: 0.75rem 0.75rem 0.5rem;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.7rem 0.75rem;
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition-fast);
  margin-bottom: 2px;
  position: relative;
  font-size: 0.9rem;
  font-weight: 500;
}

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

.nav-item.active {
  background: rgba(255, 215, 0, 0.1);
  color: var(--primary);
}

.nav-item.active::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 60%;
  background: var(--primary);
  border-radius: 0 3px 3px 0;
}

.nav-item i {
  width: 20px;
  text-align: center;
  font-size: 1rem;
}

.nav-item .badge {
  margin-left: auto;
  background: var(--danger);
  color: white;
  font-size: 0.65rem;
  font-weight: 700;
  padding: 2px 6px;
  border-radius: var(--radius-full);
  min-width: 18px;
  text-align: center;
}

.sidebar-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--border-color);
}

.sidebar-user {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem 0;
}

.sidebar-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.85rem;
  color: var(--text-on-primary);
  flex-shrink: 0;
}

.sidebar-user-info {
  flex: 1;
  min-width: 0;
}

.sidebar-user-name {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sidebar-user-tag {
  font-size: 0.7rem;
  color: var(--text-muted);
}

.sidebar-logout {
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  transition: var(--transition-fast);
}
.sidebar-logout:hover { color: var(--danger); }

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

.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  padding: 2rem;
  min-height: 100vh;
  transition: var(--transition);
}

/* === Page Header === */
.page-header {
  margin-bottom: 2rem;
}

.page-title {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.5px;
}

.page-subtitle {
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-top: 0.25rem;
}

/* ============================================
   CARDS
   ============================================ */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: var(--transition);
}

.card:hover {
  border-color: var(--border-light);
}

.card-glow:hover {
  box-shadow: var(--shadow-glow);
  border-color: rgba(255, 215, 0, 0.3);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.card-title {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.card-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -1px;
}

.card-value.gold { color: var(--primary); }
.card-value.green { color: var(--success); }

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.card-icon.gold { background: rgba(255, 215, 0, 0.1); color: var(--primary); }
.card-icon.green { background: rgba(16, 185, 129, 0.1); color: var(--success); }
.card-icon.blue { background: rgba(59, 130, 246, 0.1); color: var(--info); }
.card-icon.purple { background: rgba(108, 99, 255, 0.1); color: var(--accent); }
.card-icon.red { background: rgba(239, 68, 68, 0.1); color: var(--danger); }

/* ============================================
   GRID SYSTEM
   ============================================ */
.grid { display: grid; gap: 1.5rem; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.9rem;
  transition: var(--transition);
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: var(--text-on-primary);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 15px rgba(255, 215, 0, 0.3);
}

.btn-secondary {
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}
.btn-secondary:hover {
  border-color: var(--primary);
  color: var(--primary);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 1px solid var(--primary);
}
.btn-outline:hover {
  background: rgba(255, 215, 0, 0.1);
}

.btn-danger {
  background: var(--danger);
  color: white;
}
.btn-danger:hover {
  background: #DC2626;
}

.btn-success {
  background: var(--success);
  color: white;
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 0.5rem;
}
.btn-ghost:hover { color: var(--text-primary); }

.btn-block { width: 100%; }
.btn-sm { padding: 0.5rem 1rem; font-size: 0.8rem; }
.btn-lg { padding: 1rem 2rem; font-size: 1rem; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none !important; }

/* ============================================
   FORMS
   ============================================ */
.form-group {
  margin-bottom: 1.25rem;
}

.form-label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.form-input {
  width: 100%;
  padding: 0.85rem 1rem;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.95rem;
  transition: var(--transition-fast);
}

.form-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.1);
}

.form-input::placeholder {
  color: var(--text-muted);
}

.form-input.error {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-error {
  font-size: 0.75rem;
  color: var(--danger);
  margin-top: 0.35rem;
  display: none;
}

.form-hint {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.35rem;
}

.form-input-group {
  position: relative;
}

.form-input-group .form-input {
  padding-left: 2.75rem;
}

.form-input-group .input-icon {
  position: absolute;
  left: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.form-input-group .input-suffix {
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  cursor: pointer;
}

.form-select {
  width: 100%;
  padding: 0.85rem 1rem;
  background: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-size: 0.95rem;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23666' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  cursor: pointer;
}

.form-select:focus {
  border-color: var(--primary);
}

/* ============================================
   MODALS
   ============================================ */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}

.modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 2rem;
  width: 90%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.95) translateY(20px);
  transition: var(--transition);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 700;
}

.modal-close {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background: var(--bg-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition-fast);
}
.modal-close:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

/* ============================================
   TOAST NOTIFICATIONS
   ============================================ */
.toast-container {
  position: fixed;
  top: 1.5rem;
  right: 1.5rem;
  z-index: 3000;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.toast {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  min-width: 300px;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
  animation: toastIn 0.3s ease forwards;
}

.toast.success { border-left: 3px solid var(--success); }
.toast.error { border-left: 3px solid var(--danger); }
.toast.warning { border-left: 3px solid var(--warning); }
.toast.info { border-left: 3px solid var(--info); }

.toast-icon {
  font-size: 1.1rem;
  flex-shrink: 0;
}

.toast.success .toast-icon { color: var(--success); }
.toast.error .toast-icon { color: var(--danger); }
.toast.warning .toast-icon { color: var(--warning); }
.toast.info .toast-icon { color: var(--info); }

.toast-message {
  flex: 1;
  font-size: 0.85rem;
  color: var(--text-primary);
}

.toast-close {
  color: var(--text-muted);
  cursor: pointer;
  padding: 2px;
}
.toast-close:hover { color: var(--text-primary); }

@keyframes toastIn {
  from { opacity: 0; transform: translateX(100px); }
  to { opacity: 1; transform: translateX(0); }
}

.toast.removing {
  animation: toastOut 0.3s ease forwards;
}

@keyframes toastOut {
  from { opacity: 1; transform: translateX(0); }
  to { opacity: 0; transform: translateX(100px); }
}

/* ============================================
   TABLES
   ============================================ */
.table-wrapper {
  overflow-x: auto;
}

.table {
  width: 100%;
  border-collapse: collapse;
}

.table th {
  padding: 0.75rem 1rem;
  text-align: left;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-color);
}

.table td {
  padding: 0.85rem 1rem;
  font-size: 0.9rem;
  border-bottom: 1px solid var(--border-color);
}

.table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

/* ============================================
   STATUS BADGES
   ============================================ */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-success { background: rgba(16, 185, 129, 0.15); color: var(--success); }
.badge-danger { background: rgba(239, 68, 68, 0.15); color: var(--danger); }
.badge-warning { background: rgba(245, 158, 11, 0.15); color: var(--warning); }
.badge-info { background: rgba(59, 130, 246, 0.15); color: var(--info); }
.badge-neutral { background: var(--bg-surface); color: var(--text-secondary); }

/* ============================================
   LOADING / SPINNERS
   ============================================ */
.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border-color);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.spinner-sm { width: 20px; height: 20px; border-width: 2px; }
.spinner-lg { width: 48px; height: 48px; border-width: 4px; }

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 60vh;
  gap: 1rem;
}

.loading-screen p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.skeleton {
  background: linear-gradient(90deg, var(--bg-surface) 25%, var(--bg-elevated) 50%, var(--bg-surface) 75%);
  background-size: 200% 100%;
  animation: skeleton 1.5s ease infinite;
  border-radius: var(--radius-sm);
}

@keyframes skeleton {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ============================================
   EMPTY STATES
   ============================================ */
.empty-state {
  text-align: center;
  padding: 3rem 2rem;
}

.empty-state-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.empty-state-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.empty-state-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

/* ============================================
   TRANSACTIONS LIST
   ============================================ */
.tx-list {
  display: flex;
  flex-direction: column;
}

.tx-item {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: var(--transition-fast);
}

.tx-item:hover {
  background: rgba(255, 255, 255, 0.02);
  padding-left: 0.5rem;
  padding-right: 0.5rem;
  margin-left: -0.5rem;
  margin-right: -0.5rem;
  border-radius: var(--radius-md);
}

.tx-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.tx-icon.sent { background: rgba(239,68,68,0.1); color: var(--danger); }
.tx-icon.received { background: rgba(16,185,129,0.1); color: var(--success); }
.tx-icon.deposit { background: rgba(59,130,246,0.1); color: var(--info); }
.tx-icon.withdraw { background: rgba(245,158,11,0.1); color: var(--warning); }
.tx-icon.card { background: rgba(108,99,255,0.1); color: var(--accent); }
.tx-icon.conversion { background: rgba(255,215,0,0.1); color: var(--primary); }

.tx-info {
  flex: 1;
  min-width: 0;
}

.tx-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.tx-description {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 2px;
}

.tx-amount {
  text-align: right;
  flex-shrink: 0;
}

.tx-amount-value {
  font-size: 0.95rem;
  font-weight: 700;
}

.tx-amount-value.negative { color: var(--danger); }
.tx-amount-value.positive { color: var(--success); }

.tx-amount-date {
  font-size: 0.7rem;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ============================================
   QUICK ACTIONS
   ============================================ */
.quick-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.quick-action {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1.25rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: var(--transition);
  min-width: 100px;
  flex: 1;
}

.quick-action:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.quick-action-icon {
  width: 46px;
  height: 46px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}

.quick-action-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
}

/* ============================================
   CHIPS / FILTER BUTTONS
   ============================================ */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  border: 1.5px solid var(--border-color);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  transition: all 0.2s ease;
  white-space: nowrap;
}
.chip:hover {
  border-color: var(--primary);
  color: var(--text-primary);
}
.chip.active {
  background: var(--primary);
  color: #000;
  border-color: var(--primary);
  font-weight: 600;
  box-shadow: 0 0 10px rgba(255,215,0,0.25);
}

/* ============================================
   TABS
   ============================================ */
.tabs {
  display: flex;
  gap: 0.25rem;
  background: var(--bg-surface);
  border-radius: var(--radius-md);
  padding: 4px;
  margin-bottom: 1.5rem;
}

.tab {
  flex: 1;
  padding: 0.6rem 1rem;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-fast);
}

.tab:hover { color: var(--text-primary); }

.tab.active {
  background: var(--bg-elevated);
  color: var(--primary);
}

/* ============================================
   OTP INPUT
   ============================================ */
.otp-inputs {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  margin: 1.5rem 0;
}

.otp-input {
  width: 50px;
  height: 56px;
  text-align: center;
  font-size: 1.5rem;
  font-weight: 700;
  background: var(--bg-input);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  transition: var(--transition-fast);
}

.otp-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255, 215, 0, 0.15);
}

/* ============================================
   RESPONSIVE
   ============================================ */
.mobile-header {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 0 1rem;
  align-items: center;
  justify-content: space-between;
  z-index: 999;
}

.mobile-menu-btn {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  color: var(--text-primary);
  font-size: 1.25rem;
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
}

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

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

  .sidebar-overlay.active {
    display: block;
  }

  .mobile-header {
    display: flex;
  }

  .main-content {
    margin-left: 0;
    padding: 1rem;
    padding-top: calc(var(--header-height) + 1rem);
  }

  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }

  .quick-actions {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
  }

  .tabs {
    overflow-x: auto;
    flex-wrap: nowrap;
  }

  .tab {
    flex: none;
    white-space: nowrap;
  }

  .otp-inputs { gap: 0.5rem; }
  .otp-input { width: 42px; height: 48px; font-size: 1.25rem; }
}

@media (max-width: 480px) {
  .quick-actions {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .card-value { font-size: 1.5rem; }
  .page-title { font-size: 1.35rem; }
}

/* ============================================
   UTILITIES
   ============================================ */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-primary { color: var(--primary) !important; }
.text-success { color: var(--success) !important; }
.text-danger { color: var(--danger) !important; }
.text-muted { color: var(--text-muted) !important; }
.text-secondary { color: var(--text-secondary) !important; }

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.d-flex { display: flex; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.gap-3 { gap: 1.5rem; }

.w-100 { width: 100%; }
.hidden { display: none !important; }
.truncate { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.divider {
  height: 1px;
  background: var(--border-color);
  margin: 1.5rem 0;
}

/* Fade-in animation for page transitions */
.page-enter {
  animation: pageEnter 0.3s ease forwards;
}

@keyframes pageEnter {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}