:root {
  --primary: #0f172a;
  --primary-light: #1e293b;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --success: #059669;
  --warning: #d97706;
  --danger: #dc2626;

  --bg: #f1f5f9;
  --surface: #ffffff;
  --surface-alt: #f8fafc;
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --border-input: #cbd5e1;
  --text: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;
  --overlay: rgba(15, 23, 42, 0.5);
  --input-bg: #ffffff;
  --btn-bg: #f1f5f9;
  --btn-hover: #e2e8f0;
  --stat-icon-blue-bg: #eff6ff;
  --stat-icon-green-bg: #ecfdf5;
  --stat-icon-yellow-bg: #fffbeb;
  --stat-icon-red-bg: #fef2f2;

  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;

  --sidebar-width: 260px;
  --header-height: 60px;
}

body.dark-theme {
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-alt: #0f172a;
  --border: #334155;
  --border-light: #1e293b;
  --border-input: #475569;
  --text: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --overlay: rgba(0, 0, 0, 0.7);
  --input-bg: #0f172a;
  --btn-bg: #334155;
  --btn-hover: #475569;
  --stat-icon-blue-bg: #1e3a5f;
  --stat-icon-green-bg: #064e3b;
  --stat-icon-yellow-bg: #78350f;
  --stat-icon-red-bg: #7f1d1d;

  --gray-50: #0f172a;
  --gray-100: #1e293b;
  --gray-200: #334155;
  --gray-300: #475569;
  --gray-400: #64748b;
  --gray-500: #94a3b8;
  --gray-600: #cbd5e1;
  --gray-700: #e2e8f0;
  --gray-800: #f1f5f9;
  --gray-900: #f8fafc;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* Login */
.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: var(--primary);
}

.login-card {
  background: var(--surface);
  padding: 40px;
  width: 420px;
  max-width: 90%;
  border: 1px solid var(--border);
}

.login-card h1 {
  font-size: 24px;
  color: var(--primary);
  margin-bottom: 4px;
  text-align: center;
  letter-spacing: -0.5px;
}

.login-card .subtitle {
  color: var(--text-muted);
  text-align: center;
  margin-bottom: 32px;
  font-size: 14px;
}

/* Forms */
.form-group {
  margin-bottom: 20px;
}

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

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  border: 1px solid var(--border-input);
  font-size: 14px;
  background: var(--input-bg);
  color: var(--text);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent);
}

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

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 500;
  border: none;
  cursor: pointer;
  gap: 8px;
  background: var(--btn-bg);
  color: var(--text);
}

.btn:hover {
  background: var(--btn-hover);
}

.btn-primary {
  background: var(--accent);
  color: white;
  width: 100%;
  padding: 12px;
}

.btn-primary:hover {
  background: var(--accent-hover);
}

.btn-sm {
  padding: 6px 14px;
  font-size: 12px;
}

.btn-success { background: var(--success); color: white; }
.btn-success:hover { background: #047857; }
.btn-warning { background: var(--warning); color: white; }
.btn-warning:hover { background: #b45309; }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: #b91c1c; }
.btn-outline {
  background: transparent;
  border: 1px solid var(--border-input);
  color: var(--text-secondary);
}
.btn-outline:hover {
  background: var(--btn-bg);
}

/* Theme toggle */
.theme-toggle {
  background: none;
  border: 1px solid var(--border);
  cursor: pointer;
  padding: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  line-height: 1;
}

.theme-toggle:hover {
  background: var(--surface-alt);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

body.dark-theme .theme-toggle .sun-icon { display: block; }
body.dark-theme .theme-toggle .moon-icon { display: none; }
.theme-toggle .sun-icon { display: none; }
.theme-toggle .moon-icon { display: block; }

/* Layout */
.admin-layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: var(--sidebar-width);
  background: var(--primary);
  color: white;
  position: fixed;
  top: 0;
  left: 0;
  height: 100vh;
  overflow-y: auto;
  z-index: 100;
  transition: transform 0.2s;
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  padding: 20px 24px;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.sidebar-header h2 {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.3px;
}

.sidebar-header small {
  color: rgba(255,255,255,0.4);
  font-size: 12px;
}

.sidebar-nav {
  padding: 8px 0;
  flex: 1;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 24px;
  color: rgba(255,255,255,0.55);
  text-decoration: none;
  font-size: 14px;
  font-weight: 450;
  border-left: 3px solid transparent;
  transition: all 0.15s;
}

.sidebar-nav a:hover {
  color: rgba(255,255,255,0.85);
  background: rgba(255,255,255,0.04);
}

.sidebar-nav a.active {
  color: white;
  background: rgba(255,255,255,0.06);
  border-left-color: var(--accent);
}

.sidebar-nav a svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  opacity: 0.7;
}

.sidebar-nav a.active svg {
  opacity: 1;
}

.sidebar-nav a:hover svg {
  opacity: 0.9;
}

.sidebar-footer {
  padding: 16px 24px;
  border-top: 1px solid rgba(255,255,255,0.06);
}

.sidebar-footer a {
  color: rgba(255,255,255,0.45);
  text-decoration: none;
  font-size: 13px;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: color 0.15s;
}

.sidebar-footer a:hover {
  color: rgba(255,255,255,0.8);
}

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

.top-header {
  height: var(--header-height);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  position: sticky;
  top: 0;
  z-index: 50;
}

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

.menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  color: var(--text-muted);
  padding: 4px;
}

.top-header-left span {
  font-weight: 600;
  color: var(--text);
  font-size: 14px;
}

.top-header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.admin-user {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-secondary);
  font-size: 13px;
}

.admin-avatar {
  width: 32px;
  height: 32px;
  background: var(--accent);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 13px;
}

.page-content {
  padding: 28px 32px;
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
  flex-wrap: wrap;
  gap: 12px;
}

.page-header h1 {
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.3px;
}

/* Stats */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-bottom: 28px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
}

.stat-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.stat-icon.blue { background: var(--stat-icon-blue-bg); color: var(--accent); }
.stat-icon.green { background: var(--stat-icon-green-bg); color: var(--success); }
.stat-icon.yellow { background: var(--stat-icon-yellow-bg); color: var(--warning); }
.stat-icon.red { background: var(--stat-icon-red-bg); color: var(--danger); }

.stat-info h3 {
  font-size: 26px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.2;
}

.stat-info p {
  font-size: 13px;
  color: var(--text-secondary);
}

/* Cards */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
}

.card + .card {
  margin-top: 16px;
}

.card-header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.card-header h2 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
}

.card-body {
  padding: 20px 24px;
}

/* Tables */
.table-container {
  overflow-x: auto;
}

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

table th {
  text-align: left;
  padding: 10px 16px;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  background: var(--surface-alt);
  border-bottom: 1px solid var(--border);
}

table td {
  padding: 12px 16px;
  font-size: 14px;
  border-bottom: 1px solid var(--border-light);
  color: var(--text);
}

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

table tr:hover {
  background: var(--surface-alt);
}

table td small {
  color: var(--text-muted);
  font-size: 12px;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.3px;
  text-transform: uppercase;
}

.badge-pending { background: #fffbeb; color: #92400e; }
.badge-approved { background: #ecfdf5; color: #065f46; }
.badge-rejected { background: #fef2f2; color: #991b1b; }
.badge-converted { background: #eff6ff; color: #1e40af; }
.badge-contacted { background: #eef2ff; color: #3730a3; }
.badge-followup { background: #fdf2f8; color: #9d174d; }
.badge-not-interested { background: #f3f4f6; color: #4b5563; }
.badge-danger { background: #fef2f2; color: #dc2626; }

/* Filters */
.filters {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}

.filters input,
.filters select {
  padding: 7px 12px;
  border: 1px solid var(--border-input);
  font-size: 13px;
  background: var(--input-bg);
  color: var(--text);
}

.filters input:focus,
.filters select:focus {
  outline: none;
  border-color: var(--accent);
}

/* Modal */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--overlay);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

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

.modal {
  background: var(--surface);
  width: 560px;
  max-width: 95%;
  max-height: 85vh;
  overflow-y: auto;
  padding: 28px;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.modal-header h2 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
}

.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--text-muted);
  line-height: 1;
}

.modal-close:hover {
  color: var(--text-secondary);
}

.detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.detail-item label {
  display: block;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 4px;
}

.detail-item p {
  font-size: 15px;
  color: var(--text);
}

.detail-item.full-width {
  grid-column: 1 / -1;
}

/* Messages */
.message-container {
  max-height: 400px;
  overflow-y: auto;
  padding: 16px;
  background: var(--surface-alt);
  margin-bottom: 16px;
}

.message {
  margin-bottom: 12px;
  max-width: 80%;
}

.message.received {
  margin-right: auto;
}

.message.sent {
  margin-left: auto;
}

.message-content {
  padding: 10px 16px;
  font-size: 14px;
  line-height: 1.5;
}

.message.received .message-content {
  background: var(--surface);
  border: 1px solid var(--border);
}

.message.sent .message-content {
  background: var(--accent);
  color: white;
}

.message-info {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}

.message-input {
  display: flex;
  gap: 8px;
}

.message-input textarea {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--border-input);
  resize: none;
  font-size: 14px;
  font-family: inherit;
  background: var(--input-bg);
  color: var(--text);
}

.message-input textarea:focus {
  outline: none;
  border-color: var(--accent);
}

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

/* Map */
.map-container {
  height: 300px;
  border: 1px solid var(--border);
}

/* Empty state */
.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-muted);
}

/* Document grid */
.doc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 12px;
}

.doc-item {
  border: 1px solid var(--border);
  padding: 16px 12px;
  text-align: center;
}

.doc-item .doc-icon {
  font-size: 28px;
  margin-bottom: 8px;
}

.doc-item .doc-label {
  font-size: 12px;
  font-weight: 600;
  text-transform: capitalize;
  color: var(--text);
}

.doc-item .doc-name {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.doc-item .btn {
  margin-top: 10px;
  width: 100%;
}

/* Conversations list */
.conv-list {
  max-height: calc(100vh - 160px);
  overflow-y: auto;
}

.conv-item {
  display: block;
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-light);
  text-decoration: none;
  color: inherit;
}

.conv-item:hover {
  background: var(--surface-alt);
}

.conv-item.active {
  background: var(--surface-alt);
  border-left: 3px solid var(--accent);
}

.conv-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

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

.conv-time {
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
}

.conv-preview {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 4px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.conv-meta {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 4px;
}

.conv-unread {
  display: inline-block;
  background: var(--danger);
  color: white;
  font-size: 10px;
  padding: 1px 6px;
  margin-left: 6px;
  font-weight: 600;
}

/* Messages layout */
.messages-layout {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 0;
  border: 1px solid var(--border);
}

.messages-layout .conv-list-side {
  border-right: 1px solid var(--border);
}

.messages-layout .chat-side {
  display: flex;
  flex-direction: column;
}

.chat-header {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.chat-body {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  background: var(--surface-alt);
}

.chat-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
}

.chat-empty {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  color: var(--text-muted);
  padding: 40px;
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
  }
  .sidebar.open {
    transform: translateX(0);
  }
  .main-content {
    margin-left: 0;
  }
  .menu-toggle {
    display: block;
  }
  .detail-grid {
    grid-template-columns: 1fr;
  }
  .stats-grid {
    grid-template-columns: 1fr 1fr;
  }
  .messages-layout {
    grid-template-columns: 1fr;
  }
  .page-content {
    padding: 20px 16px;
  }
}