/* ==========================================================================
   Payment & Domain Tracker — Premium Responsive Stylesheet
   Modern, Desktop & Mobile-first Clean Aesthetics matching UI references
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  /* Primary & Slate Gradients */
  --bg-app: #f8fafc;
  --bg-card: #ffffff;
  --bg-sidebar: #0f172a;
  --bg-sidebar-hover: rgba(255, 255, 255, 0.06);
  --bg-sidebar-active: #2563eb;
  
  --text-main: #0f172a;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --text-white: #ffffff;

  --border-color: #e2e8f0;
  --border-subtle: #f1f5f9;

  /* Accent Colors */
  --primary: #2563eb;
  --primary-light: #eff6ff;
  --success: #10b981;
  --success-light: #ecfdf5;
  --warning: #f97316;
  --warning-light: #fff7ed;
  --danger: #ef4444;
  --danger-light: #fef2f2;
  --purple: #8b5cf6;
  --purple-light: #f5f3ff;
  --cyan: #06b6d4;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px 0 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, 0.03);

  --sidebar-width: 260px;
  --header-height: 68px;
}

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

body {
  font-family: var(--font-family);
  background-color: var(--bg-app);
  color: var(--text-main);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

/* App Container */
.app-container {
  display: flex;
  min-height: 100vh;
  width: 100%;
}

/* ==========================================================================
   Sidebar (Desktop)
   ========================================================================== */
.sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-sidebar);
  color: var(--text-light);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 50;
  transition: transform 0.25s ease;
  overflow-y: auto;
}

.sidebar-header {
  padding: 24px 20px 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.brand-icon {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, #3b82f6 0%, #1d4ed8 100%);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 10px rgba(37, 99, 235, 0.35);
}

.brand-text {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-white);
  letter-spacing: -0.01em;
}

.sidebar-nav {
  padding: 20px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  border-radius: var(--radius-md);
  color: #94a3b8;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.15s ease;
}

.nav-item:hover {
  background-color: var(--bg-sidebar-hover);
  color: #f8fafc;
}

.nav-item.active {
  background-color: var(--bg-sidebar-active);
  color: #ffffff;
  font-weight: 600;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
}

.nav-item svg {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.sidebar-footer {
  padding: 16px 20px 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.sync-status-box {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.sync-info {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.sync-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: #64748b;
  font-weight: 600;
}

.sync-time {
  font-size: 12px;
  color: #cbd5e1;
  font-weight: 500;
}

.sync-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 11px;
  font-weight: 600;
  color: #34d399;
  background: rgba(16, 185, 129, 0.15);
  padding: 2px 8px;
  border-radius: var(--radius-full);
  margin-top: 4px;
  width: fit-content;
}

.sync-btn {
  background: transparent;
  border: none;
  color: #94a3b8;
  cursor: pointer;
  padding: 6px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}

.sync-btn:hover {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
}

.version-text {
  font-size: 12px;
  color: #475569;
}

/* ==========================================================================
   Main Content Layout
   ========================================================================== */
.main-wrapper {
  margin-left: var(--sidebar-width);
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

/* Top Header */
.topbar {
  height: var(--header-height);
  background-color: var(--bg-card);
  border-bottom: 1px solid var(--border-color);
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 40;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-main);
  padding: 6px;
}

.page-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.01em;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.notification-btn {
  position: relative;
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.15s;
}

.notification-btn:hover {
  background: #f1f5f9;
  color: var(--text-main);
}

.notification-badge {
  position: absolute;
  top: 4px;
  right: 4px;
  background-color: var(--danger);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid #fff;
}

.user-profile {
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  transition: background 0.15s;
}

.user-profile:hover {
  background: #f1f5f9;
}

.user-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 13px;
}

.user-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
}

/* Page Content Body */
.content-body {
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 24px;
  flex: 1;
}

/* ==========================================================================
   KPI Summary Cards
   ========================================================================== */
.kpi-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.kpi-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  align-items: center;
  gap: 18px;
  box-shadow: var(--shadow-sm);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

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

.kpi-icon-wrapper {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.kpi-icon-wrapper.green {
  background-color: var(--success);
  color: #fff;
}

.kpi-icon-wrapper.blue {
  background-color: var(--primary);
  color: #fff;
}

.kpi-icon-wrapper.purple {
  background-color: var(--purple);
  color: #fff;
}

.kpi-icon-wrapper.orange {
  background-color: var(--warning);
  color: #fff;
}

.kpi-content {
  display: flex;
  flex-direction: column;
}

.kpi-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-muted);
}

.kpi-value {
  font-size: 22px;
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.02em;
  margin: 2px 0;
}

.kpi-value.green { color: #059669; }
.kpi-value.blue { color: #2563eb; }
.kpi-value.purple { color: #7c3aed; }
.kpi-value.orange { color: #ea580c; }

.kpi-sub {
  font-size: 12px;
  color: var(--text-light);
}

/* ==========================================================================
   Split Section Grid (Systems Overview + Domains Expiring Soon)
   ========================================================================== */
.split-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.card-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.card-panel-header {
  padding: 18px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
}

.card-panel-title {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-main);
}

.card-panel-link {
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  transition: color 0.15s;
}

.card-panel-link:hover {
  text-decoration: underline;
}

/* Systems Overview List / Table */
.systems-list {
  display: flex;
  flex-direction: column;
}

.system-item-row {
  padding: 16px 22px;
  border-bottom: 1px solid var(--border-subtle);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background 0.15s;
}

.system-item-row:last-child {
  border-bottom: none;
}

.system-item-row:hover {
  background: #fbfcfd;
}

.system-info-group {
  display: flex;
  align-items: center;
  gap: 14px;
}

.system-avatar-icon {
  width: 42px;
  height: 42px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  flex-shrink: 0;
}

.system-name {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
}

.system-sub {
  font-size: 12px;
  color: var(--text-muted);
}

.system-metrics {
  display: flex;
  align-items: center;
  gap: 24px;
}

.metric-col {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
}

.metric-col .label {
  font-size: 11px;
  color: var(--text-light);
}

.metric-col .val {
  font-size: 14px;
  font-weight: 700;
  color: #059669;
}

.metric-col .val.date {
  color: var(--text-main);
  font-weight: 500;
}

.btn-secondary-sm {
  background: #f1f5f9;
  border: 1px solid var(--border-color);
  color: var(--primary);
  font-size: 12px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s;
}

.btn-secondary-sm:hover {
  background: var(--primary-light);
  border-color: var(--primary);
}

/* Domains Expiring Table */
.data-table-container {
  overflow-x: auto;
  width: 100%;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 13.5px;
}

.data-table th {
  background: #f8fafc;
  padding: 12px 18px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: capitalize;
  border-bottom: 1px solid var(--border-color);
  white-space: nowrap;
}

.data-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-main);
  vertical-align: middle;
}

.data-table tr:hover td {
  background-color: #fbfcfd;
}

.domain-cell-name {
  font-weight: 700;
  color: var(--text-main);
}

.domain-cell-reg {
  font-size: 12px;
  color: var(--text-muted);
}

/* Badges */
.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 600;
  white-space: nowrap;
}

.badge-pill.danger {
  background-color: var(--danger-light);
  color: var(--danger);
  border: 1px solid #fecaca;
}

.badge-pill.warning {
  background-color: var(--warning-light);
  color: var(--warning);
  border: 1px solid #fed7aa;
}

.badge-pill.success {
  background-color: var(--success-light);
  color: var(--success);
  border: 1px solid #a7f3d0;
}

.badge-pill.primary {
  background-color: var(--primary-light);
  color: var(--primary);
  border: 1px solid #bfdbfe;
}

.badge-pill.purple {
  background-color: var(--purple-light);
  color: var(--purple);
  border: 1px solid #ddd6fe;
}

.status-text-danger { color: var(--danger); font-weight: 600; }
.status-text-warning { color: var(--warning); font-weight: 600; }
.status-text-success { color: var(--success); font-weight: 600; }

/* ==========================================================================
   Transactions Full Section (Filter Toolbar & Table)
   ========================================================================== */
.transactions-panel {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.filter-toolbar {
  padding: 16px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 14px;
  border-bottom: 1px solid var(--border-color);
  background: #ffffff;
}

.filter-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}

.form-select, .form-input {
  background: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: 13px;
  font-family: inherit;
  color: var(--text-main);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.form-select:focus, .form-input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.btn-primary {
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background 0.15s;
}

.btn-primary:hover {
  background: #1d4ed8;
}

.btn-outline {
  background: #fff;
  color: var(--text-main);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: background 0.15s, border-color 0.15s;
}

.btn-outline:hover {
  background: #f8fafc;
  border-color: #cbd5e1;
}

/* Pagination Footer */
.table-footer {
  padding: 14px 22px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--border-color);
  background: #ffffff;
  font-size: 13px;
  color: var(--text-muted);
}

.pagination-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}

.page-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-color);
  background: #fff;
  color: var(--text-main);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

.page-btn:hover {
  background: #f1f5f9;
}

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

.page-btn.disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

/* ==========================================================================
   Mobile Bottom Navigation
   ========================================================================== */
.mobile-bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 64px;
  background: #ffffff;
  border-top: 1px solid var(--border-color);
  z-index: 100;
  align-items: center;
  justify-content: space-around;
  box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.05);
}

.mobile-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #64748b;
  font-size: 11px;
  font-weight: 500;
  gap: 4px;
  flex: 1;
  height: 100%;
}

.mobile-nav-item.active {
  color: var(--primary);
  font-weight: 700;
}

.mobile-nav-item svg {
  width: 22px;
  height: 22px;
}

/* ==========================================================================
   Responsive Adaptations
   ========================================================================== */
@media (max-width: 1024px) {
  .kpi-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .split-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .main-wrapper {
    margin-left: 0;
    padding-bottom: 74px; /* Space for bottom nav */
  }
  .mobile-toggle {
    display: block;
  }
  .topbar {
    padding: 0 16px;
  }
  .content-body {
    padding: 16px;
    gap: 18px;
  }
  .kpi-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .mobile-bottom-nav {
    display: flex;
  }
  .user-name {
    display: none;
  }
}

/* Modals */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  z-index: 150;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.modal-backdrop.open {
  display: flex;
}

.modal-card {
  background: #ffffff;
  border-radius: var(--radius-lg);
  max-width: 540px;
  width: 100%;
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: modalFadeIn 0.2s ease-out;
}

@keyframes modalFadeIn {
  from { opacity: 0; transform: scale(0.96); }
  to { opacity: 1; transform: scale(1); }
}

.modal-header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 17px;
  font-weight: 700;
  color: var(--text-main);
}

.modal-close {
  background: none;
  border: none;
  font-size: 20px;
  color: var(--text-muted);
  cursor: pointer;
}

.modal-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-footer {
  padding: 16px 24px;
  background: #f8fafc;
  border-top: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
}