:root {
  --bg-body: #f1f5f9;
  --bg-surface: #ffffff;
  --bg-elevated: #f8fafc;
  --bg-sidebar: #090d16;
  --bg-sidebar-hover: rgba(255, 255, 255, 0.06);
  --bg-sidebar-active: linear-gradient(135deg, #2563eb 0%, #4f46e5 100%);
  --text-main: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-light: #94a3b8;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --primary-soft: #eff6ff;
  --indigo: #4f46e5;
  --success: #10b981;
  --success-soft: #ecfdf5;
  --warning: #f59e0b;
  --warning-soft: #fffbeb;
  --danger: #ef4444;
  --danger-soft: #fef2f2;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.05);
  --shadow-md: 0 6px 16px -3px rgba(15, 23, 42, 0.08), 0 2px 6px -2px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 20px 35px -8px rgba(15, 23, 42, 0.16), 0 8px 14px -6px rgba(15, 23, 42, 0.08);
}

body.dark-mode {
  --bg-body: #0b1120;
  --bg-surface: #111827;
  --bg-elevated: #1e293b;
  --text-main: #f8fafc;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --border: #1e293b;
  --border-strong: #334155;
  --primary-soft: rgba(37, 99, 235, 0.15);
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background-color: var(--bg-body);
  color: var(--text-main);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.2s ease, color 0.2s ease;
}

/* ============================================================================
   AUTH / LOGIN VIEW
   ============================================================================ */
.auth-wrapper {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at 15% 20%, #1e3a8a 0%, #0f172a 45%, #020617 100%);
  padding: 24px;
  position: relative;
  overflow: hidden;
}

.auth-wrapper::before {
  content: "";
  position: absolute;
  width: 550px;
  height: 550px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(59, 130, 246, 0.18) 0%, transparent 70%);
  top: -150px;
  right: -100px;
  pointer-events: none;
}

.auth-card {
  width: 100%;
  max-width: 460px;
  background: var(--bg-surface);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 20px;
  box-shadow: 0 25px 60px -15px rgba(0, 0, 0, 0.6);
  padding: 40px 36px;
  position: relative;
  z-index: 2;
}

.auth-logo-badge {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  background: linear-gradient(135deg, #2563eb 0%, #4f46e5 100%);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 20px;
  margin-bottom: 20px;
  box-shadow: 0 10px 20px -5px rgba(37, 99, 235, 0.45);
}

.auth-title {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
  margin-bottom: 6px;
}

.auth-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 26px;
}

/* ============================================================================
   APP SHELL & SIDEBAR
   ============================================================================ */
.app-shell {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 276px;
  background: var(--bg-sidebar);
  color: #f8fafc;
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  bottom: 0;
  left: 0;
  z-index: 40;
  border-right: 1px solid rgba(255, 255, 255, 0.07);
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.sidebar-brand {
  padding: 22px 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  display: flex;
  align-items: center;
  gap: 13px;
}

.brand-avatar {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, #3b82f6 0%, #4f46e5 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 16px;
  color: #fff;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.35);
}

.brand-text h1 {
  font-size: 15px;
  font-weight: 700;
  color: #ffffff;
  letter-spacing: -0.01em;
}

.brand-text span {
  font-size: 11.5px;
  color: #94a3b8;
  display: block;
  margin-top: 2px;
}

.sidebar-nav {
  flex: 1;
  overflow-y: auto;
  padding: 14px 12px;
}

.nav-section-label {
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #64748b;
  padding: 14px 12px 6px;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 11px;
  width: 100%;
  padding: 10px 13px;
  border-radius: 10px;
  border: none;
  background: transparent;
  color: #cbd5e1;
  font-size: 13.5px;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: all 0.16s ease;
  margin-bottom: 3px;
}

.nav-item:hover {
  background: var(--bg-sidebar-hover);
  color: #ffffff;
  transform: translateX(2px);
}

.nav-item.active {
  background: var(--bg-sidebar-active);
  color: #ffffff;
  font-weight: 600;
  box-shadow: 0 6px 16px -3px rgba(37, 99, 235, 0.45);
}

.sidebar-footer {
  padding: 15px 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  background: rgba(255, 255, 255, 0.02);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: #94a3b8;
}

/* ============================================================================
   MAIN AREA & TOPBAR
   ============================================================================ */
.main-area {
  flex: 1;
  margin-left: 276px;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.topbar {
  height: 68px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  padding: 0 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 30;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.03);
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 14px;
}

.mobile-menu-btn {
  display: none;
  background: var(--bg-elevated);
  color: var(--text-main);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 10px;
  cursor: pointer;
}

.page-heading {
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 10px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
  display: inline-block;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

.user-pill {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 13px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-main);
}

.content-container {
  padding: 28px;
  max-width: 1480px;
  width: 100%;
  margin: 0 auto;
}

/* ============================================================================
   HERO BANNER & KPI CARDS
   ============================================================================ */
.welcome-banner {
  background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 60%, #312e81 100%);
  border-radius: var(--radius-lg);
  padding: 26px 30px;
  color: #ffffff;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 18px;
  box-shadow: var(--shadow-md);
}

.welcome-banner h2 {
  font-size: 22px;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}

.welcome-banner p {
  font-size: 13.5px;
  color: #cbd5e1;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 18px;
  margin-bottom: 24px;
}

.stat-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px 22px;
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  transition: all 0.18s ease;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.stat-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: #93c5fd;
}

.stat-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.stat-value {
  font-size: 30px;
  font-weight: 800;
  color: var(--text-main);
  margin-top: 6px;
  letter-spacing: -0.02em;
}

.stat-sub {
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 5px;
}

.stat-icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  flex-shrink: 0;
}

/* ============================================================================
   CARDS, GRIDS & TABLES
   ============================================================================ */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  margin-bottom: 24px;
  overflow: hidden;
}

.card-header {
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

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

.card-subtitle {
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 2px;
}

.card-body {
  padding: 24px;
}

/* Media Card Grid View */
.media-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(290px, 1fr));
  gap: 20px;
}

.media-card {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: transform 0.16s ease, box-shadow 0.16s ease;
}

.media-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.media-card-img {
  width: 100%;
  height: 170px;
  object-fit: cover;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
}

.media-card-body {
  padding: 16px;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.media-card-title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.media-card-desc {
  font-size: 12.5px;
  color: var(--text-muted);
  margin-bottom: 14px;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.media-card-footer {
  padding-top: 12px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
}

/* Filter Tabs & Toolbars */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 18px;
}

.tab-group {
  display: inline-flex;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  padding: 4px;
  border-radius: 10px;
  flex-wrap: wrap;
  gap: 3px;
}

.tab-btn {
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 13px;
  font-weight: 600;
  padding: 7px 14px;
  border-radius: 7px;
  cursor: pointer;
  transition: all 0.15s;
}

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

.tab-btn.active {
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 2px 6px rgba(37, 99, 235, 0.3);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 9px 16px;
  font-size: 13.5px;
  font-weight: 600;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.15s ease;
  text-decoration: none;
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-primary {
  background: linear-gradient(135deg, #2563eb 0%, #4f46e5 100%);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}

.btn-primary:hover:not(:disabled) {
  filter: brightness(1.08);
}

.btn-secondary {
  background: var(--bg-surface);
  border-color: var(--border-strong);
  color: var(--text-main);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-elevated);
}

.btn-danger {
  background: var(--danger-soft);
  color: var(--danger);
  border-color: #fecaca;
}

.btn-danger:hover:not(:disabled) {
  background: var(--danger);
  color: #ffffff;
}

.btn-sm {
  padding: 6px 11px;
  font-size: 12.5px;
  border-radius: 7px;
}

/* Forms & Inputs */
.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group.full-width {
  grid-column: 1 / -1;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.form-hint {
  font-size: 11.5px;
  color: var(--text-muted);
  margin-top: 4px;
}

.form-control {
  width: 100%;
  padding: 9.5px 12px;
  font-size: 13.5px;
  font-family: inherit;
  color: var(--text-main);
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: 8px;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.14);
}

textarea.form-control {
  min-height: 92px;
  resize: vertical;
}

/* Rich Text Editor */
.rte-wrapper {
  border: 1px solid var(--border-strong);
  border-radius: 10px;
  overflow: hidden;
  background: var(--bg-surface);
}

.rte-toolbar {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 4px;
  padding: 8px 10px;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
}

.rte-btn {
  padding: 5px 10px;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-surface);
  border: 1px solid var(--border-strong);
  border-radius: 6px;
  cursor: pointer;
}

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

.rte-editor {
  min-height: 230px;
  max-height: 460px;
  overflow-y: auto;
  padding: 16px;
  font-size: 14px;
  line-height: 1.65;
  outline: none;
  color: var(--text-main);
}

.rte-editor ul, .rte-editor ol {
  padding-left: 24px;
  margin: 8px 0;
}

.rte-editor p {
  margin-bottom: 10px;
}

.rte-source {
  width: 100%;
  min-height: 230px;
  padding: 16px;
  font-family: 'Consolas', 'Monaco', monospace;
  font-size: 13px;
  border: none;
  outline: none;
  background: #0f172a;
  color: #e2e8f0;
  display: none;
}

/* Data Tables */
.table-responsive {
  width: 100%;
  overflow-x: auto;
}

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

.data-table th {
  padding: 13px 16px;
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
}

.data-table td {
  padding: 13px 16px;
  font-size: 13.5px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
}

.data-table tr:hover td {
  background: var(--bg-elevated);
}

.thumb-img {
  width: 60px;
  height: 44px;
  object-fit: cover;
  border-radius: 7px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 3.5px 10px;
  font-size: 11.5px;
  font-weight: 600;
  border-radius: 999px;
}

.badge-blue { background: #dbeafe; color: #1e40af; }
.badge-green { background: #d1fae5; color: #065f46; }
.badge-amber { background: #fef3c7; color: #92400e; }
.badge-purple { background: #ede9fe; color: #5b21b6; }
.badge-rose { background: #ffe4e6; color: #9f1239; }
.badge-slate { background: #e2e8f0; color: #334155; }

/* Modals */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.65);
  backdrop-filter: blur(3px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 100;
}

.modal-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  width: 100%;
  max-width: 840px;
  max-height: 92vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-lg);
  animation: modalFadeIn 0.18s ease-out;
}

@keyframes modalFadeIn {
  from { opacity: 0; transform: translateY(10px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-header {
  padding: 18px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-title {
  font-size: 17px;
  font-weight: 700;
}

.modal-body {
  padding: 24px;
  overflow-y: auto;
  flex: 1;
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
  border-bottom-left-radius: var(--radius-lg);
  border-bottom-right-radius: var(--radius-lg);
}

/* Image Upload Preview Box */
.image-upload-box {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 14px;
  border: 1.5px dashed var(--border-strong);
  border-radius: 10px;
  background: var(--bg-elevated);
}

.image-preview-large {
  width: 120px;
  height: 84px;
  object-fit: cover;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
}

/* Citation Bar Chart */
.chart-bars-wrap {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  height: 180px;
  padding: 20px 8px 6px;
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}

.chart-bar-col {
  flex: 1;
  min-width: 28px;
  display: flex;
  flex-direction: column;
  align-items: center;
  height: 100%;
  justify-content: flex-end;
}

.chart-bar-fill {
  width: 100%;
  max-width: 28px;
  background: linear-gradient(180deg, #3b82f6 0%, #1d4ed8 100%);
  border-radius: 5px 5px 0 0;
  transition: height 0.3s ease;
  position: relative;
}

.chart-bar-fill:hover {
  background: linear-gradient(180deg, #10b981 0%, #059669 100%);
}

.chart-bar-val {
  font-size: 10px;
  font-weight: 700;
  color: var(--text-muted);
  margin-bottom: 3px;
}

.chart-bar-year {
  font-size: 10.5px;
  color: var(--text-muted);
  margin-top: 6px;
  font-weight: 600;
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  min-width: 290px;
  max-width: 430px;
  padding: 14px 18px;
  border-radius: 10px;
  background: #0f172a;
  color: #ffffff;
  font-size: 13.5px;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  border-left: 4px solid var(--primary);
}

.toast.toast-success { border-left-color: var(--success); }
.toast.toast-error { border-left-color: var(--danger); }

@media (max-width: 960px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .main-area {
    margin-left: 0;
  }
  .mobile-menu-btn {
    display: inline-flex;
  }
  .form-grid {
    grid-template-columns: 1fr;
  }
}