/* ========================================
   CorePanel v2 — DeepSeek Dark Theme
   ======================================== */

:root {
  --bg-primary: #f5f5f7;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #fafafa;
  --bg-elevated: #ffffff;
  --bg-input: #ffffff;
  --bg-hover: rgba(0,0,0,0.03);
  --accent: #0071e3;
  --accent-dim: #0ea5e9;
  --accent-glow: rgba(0,113,227,0.1);
  --accent-gradient: linear-gradient(135deg, #0071e3, #0ea5e9);
  --text-primary: #1d1d1f;
  --text-secondary: #86868b;
  --text-tertiary: #aeaeb2;
  --text-inverse: #ffffff;
  --border: rgba(0,0,0,0.06);
  --border-light: rgba(0,0,0,0.1);
  --border-card: rgba(0,0,0,0.04);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.08);
  --shadow-glow: 0 0 20px rgba(0,113,227,0.06);
  --success: #34c759;
  --success-bg: rgba(52,199,89,0.12);
  --warning: #ff9f0a;
  --warning-bg: rgba(255,159,10,0.12);
  --danger: #ff3b30;
  --danger-bg: rgba(255,59,48,0.12);
  --info: #0ea5e9;
  --info-bg: rgba(14,165,233,0.12);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;
  --topbar-height: 56px;
  --content-max-width: 1280px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'SF Mono', 'Fira Code', 'JetBrains Mono', monospace;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --line-height: 1.6;
}

[data-theme="dark"] {
  --bg-primary: #05070a;
  --bg-secondary: #0a0d14;
  --bg-card: #0d1117;
  --bg-card-hover: #131823;
  --bg-elevated: #161b22;
  --bg-input: #0d1117;
  --bg-hover: rgba(255,255,255,0.04);
  --accent: #00f0ff;
  --accent-dim: #0ea5e9;
  --accent-glow: rgba(0,240,255,0.15);
  --accent-gradient: linear-gradient(135deg, #00f0ff, #0ea5e9);
  --text-primary: #e8eaed;
  --text-secondary: #9aa0a6;
  --text-tertiary: #5f6368;
  --text-inverse: #05070a;
  --border: rgba(255,255,255,0.06);
  --border-light: rgba(255,255,255,0.1);
  --border-card: rgba(255,255,255,0.04);
  --success: #34c759;
  --success-bg: rgba(52,199,89,0.12);
  --warning: #ff9f0a;
  --warning-bg: rgba(255,159,10,0.12);
  --danger: #ff3b30;
  --danger-bg: rgba(255,59,48,0.12);
  --info: #0ea5e9;
  --info-bg: rgba(14,165,233,0.12);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.5);
  --shadow-glow: 0 0 20px rgba(0,240,255,0.08);
}

/* === Reset & Base === */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body {
  font-family: var(--font-sans);
  font-weight: var(--font-weight-normal);
  line-height: var(--line-height);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  overflow-x: hidden;
  padding-top: var(--topbar-height);
}
a { color: inherit; text-decoration: none; }
button { font-family: var(--font-sans); cursor: pointer; }
input, select, textarea { font-family: var(--font-sans); outline: none; }

/* === Scrollbar === */
::-webkit-scrollbar { width: 4px; height: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }

/* === Typography === */
.text-mono { font-family: var(--font-mono); }
.text-num { font-variant-numeric: tabular-nums; }
.text-truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.text-center { text-align: center; }
h1, h2, h3, h4 { font-weight: var(--font-weight-semibold); line-height: 1.3; }

/* ========================================
   Topbar Navigation (hover-expand)
   ======================================== */

.topbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--topbar-height);
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(0,0,0,0.06);
  z-index: 100;
  display: flex;
  align-items: center;
  padding: 0 24px;
}

[data-theme="dark"] .topbar {
  background: #080b12;
  border-bottom: 1px solid rgba(0,240,255,0.06);
}

.topbar-inner {
  display: flex;
  align-items: center;
  width: 100%;
  max-width: var(--content-max-width);
  margin: 0 auto;
}

/* === Logo === */
.topbar-logo {
  display: flex;
  align-items: center;
  gap: 0;
  flex-shrink: 0;
  position: relative;
  min-width: 0;
}

.logo-icon {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-sm);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 13px;
  line-height: 1;
  box-shadow: 0 2px 10px rgba(0,240,255,0.25);
  flex-shrink: 0;
  position: relative;
  z-index: 2;
}

.logo-text {
  font-size: 15px;
  font-weight: var(--font-weight-semibold);
  white-space: nowrap;
  max-width: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-width 0.25s ease, opacity 0.2s ease, margin 0.25s ease;
  color: var(--text-primary);
  margin-left: 0;
}

.topbar:hover .logo-text {
  max-width: 120px;
  opacity: 1;
  margin-left: 8px;
}

/* === Nav Container (absolutely centered) === */
.topbar-nav {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 4px;
  white-space: nowrap;
}

/* === Nav Item === */
.topbar-nav-item {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0;
  padding: 6px 8px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
  user-select: none;
}

.topbar-nav-item:has(.nav-dropdown) {
  padding-right: 9px;
}

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

.topbar-nav-item.active {
  color: var(--accent);
  background: var(--accent-glow);
}

.topbar-nav-item i:first-child {
  font-size: 15px;
  width: 18px;
  text-align: center;
  flex-shrink: 0;
}

/* === Nav label — collapsed by default === */
.nav-label {
  font-size: 13px;
  font-weight: var(--font-weight-medium);
  max-width: 0;
  min-width: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-width 0.25s ease, opacity 0.2s ease;
  white-space: nowrap;
}

.topbar:hover .nav-label {
  max-width: 80px;
  opacity: 1;
  margin-left: 4px;
}

/* Arrow icon — collapsed by default */
.nav-arrow {
  font-size: 8px;
  opacity: 0;
  max-width: 0;
  min-width: 0;
  overflow: hidden;
  transition: opacity 0.2s ease, max-width 0.25s ease;
}

.topbar:hover .nav-arrow {
  opacity: 0.4;
  max-width: 12px;
  margin-left: 2px;
}

/* === Dropdown Menu (sub-pages) === */
.nav-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) translateY(-4px);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: 6px;
  min-width: 160px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.2s ease;
  z-index: 200;
}

.topbar-nav-item:hover .nav-dropdown,
.topbar-nav-item.show .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav-dropdown a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--text-secondary);
  transition: all 0.12s;
}

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

.nav-dropdown a i {
  font-size: 13px;
  width: 16px;
}

.nav-dropdown a.active {
  color: var(--accent);
  background: var(--accent-glow);
}

/* === Right side === */
.topbar-right {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 4px;
  flex: 1;
}

.topbar-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 16px;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: all 0.15s;
  cursor: pointer;
  position: relative;
}

.topbar-btn:hover { color: var(--text-primary); background: var(--bg-hover); }

/* === User Menu === */
.user-menu {
  display: flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  padding: 4px 8px 4px 4px;
  border-radius: var(--radius-full);
  transition: background 0.15s;
}

.user-menu:hover { background: var(--bg-hover); }

.user-avatar {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 11px;
  font-weight: var(--font-weight-semibold);
  flex-shrink: 0;
}

.user-name {
  font-size: 13px;
  color: var(--text-primary);
  font-weight: var(--font-weight-medium);
}

.user-chevron {
  font-size: 10px;
  color: var(--text-tertiary);
}

/* === Dropdown (user menu) === */
.dropdown { position: relative; }
.dropdown-menu {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  min-width: 170px;
  padding: 6px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: all 0.2s ease;
  z-index: 200;
}
.dropdown-menu.show { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.12s;
}
.dropdown-item:hover { background: var(--bg-hover); color: var(--text-primary); }
.dropdown-item i { width: 16px; text-align: center; font-size: 14px; }
.dropdown-divider { height: 1px; background: var(--border); margin: 4px 0; }

/* === Mobile Hamburger === */
.hamburger {
  display: none;
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 18px;
  padding: 8px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}
.hamburger:hover { background: var(--bg-hover); }

/* === Mobile Sidebar (drawer) === */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  backdrop-filter: blur(4px);
  z-index: 300;
}
.sidebar-overlay.open { display: block; }

.sidebar {
  position: fixed;
  top: 0;
  left: -280px;
  width: 280px;
  height: 100vh;
  background: var(--bg-secondary);
  border-right: 1px solid var(--border);
  z-index: 400;
  transition: left 0.3s ease;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}
.sidebar.open { left: 0; }

.sidebar-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 16px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.sidebar-header .logo-icon {
  width: 28px; height: 28px;
  border-radius: var(--radius-sm);
  background: var(--accent-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 13px;
  flex-shrink: 0;
}
.sidebar-title {
  font-size: 16px;
  font-weight: var(--font-weight-semibold);
  flex: 1;
}
.sidebar-close {
  background: none; border: none;
  color: var(--text-secondary); font-size: 18px;
  padding: 4px; border-radius: var(--radius-sm);
  cursor: pointer;
}
.sidebar-close:hover { color: var(--text-primary); background: var(--bg-hover); }

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

.sidebar-link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.12s;
  text-decoration: none;
}
.sidebar-link:hover { background: var(--bg-hover); color: var(--text-primary); }
.sidebar-link.active { background: var(--accent-glow); color: var(--accent); }
.sidebar-link i:first-child { width: 18px; text-align: center; font-size: 15px; }

.sidebar-group-title {
  display: flex;
  align-items: center;
  gap: 12px;
}
.sidebar-arrow {
  margin-left: auto;
  font-size: 10px;
  transition: transform 0.2s ease;
}
.sidebar-group.open .sidebar-arrow { transform: rotate(180deg); }

.sidebar-sublist {
  overflow: hidden;
  max-height: 0;
  transition: max-height 0.25s ease;
}
.sidebar-group.open .sidebar-sublist { max-height: 300px; }

.sidebar-sublink {
  display: block;
  padding: 8px 12px 8px 42px;
  font-size: 13px;
  color: var(--text-tertiary);
  text-decoration: none;
  transition: all 0.12s;
  border-radius: var(--radius-sm);
}
.sidebar-sublink:hover { background: var(--bg-hover); color: var(--text-primary); }
.sidebar-sublink.active { color: var(--accent); }

/* ========================================
   Main Content (centered)
   ======================================== */

.main-content {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: 28px 24px;
  min-height: calc(100vh - var(--topbar-height));
}

/* ========================================
   Cards
   ======================================== */

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  transition: all 0.2s ease;
}
.card:hover {
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-glow);
}
.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}
.card-header h2, .card-header h3 {
  font-size: 14px;
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
}
.card-body { padding: 20px; }
.card-footer {
  padding: 12px 20px;
  border-top: 1px solid var(--border);
}

/* === Metric/Stat Cards === */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 16px;
}

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-lg);
  padding: 20px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  transition: all 0.2s ease;
  position: relative;
  overflow: hidden;
}
.metric-card:hover {
  background: var(--bg-card-hover);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
}
.metric-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  margin-bottom: 12px;
}
.metric-icon.accent { background: var(--accent-glow); color: var(--accent); }
.metric-icon.success { background: var(--success-bg); color: var(--success); }
.metric-icon.warning { background: var(--warning-bg); color: var(--warning); }
.metric-icon.danger { background: var(--danger-bg); color: var(--danger); }
.metric-value {
  font-size: 28px;
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  font-variant-numeric: tabular-nums;
  color: var(--text-primary);
}
.metric-label { font-size: 12px; color: var(--text-secondary); margin-top: 4px; }
.metric-sub { font-size: 11px; color: var(--text-tertiary); margin-top: 8px; }

/* ========================================
   Buttons
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 20px;
  font-size: 13px;
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}
.btn-primary {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 2px 8px var(--accent-glow);
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--accent-glow);
}
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
}
.btn-secondary:hover { background: var(--bg-card-hover); border-color: var(--text-tertiary); }
.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { opacity: 0.9; transform: translateY(-1px); }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { opacity: 0.9; transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--text-secondary); }
.btn-ghost:hover { background: var(--bg-hover); color: var(--text-primary); }
.btn-sm { padding: 4px 12px; font-size: 12px; }
.btn-lg { padding: 12px 28px; font-size: 15px; }

/* ========================================
   Forms
   ======================================== */

.form-group { margin-bottom: 16px; }
.form-label {
  display: block;
  font-size: 13px;
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.form-input, .form-select, .form-textarea {
  width: 100%;
  padding: 8px 14px;
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--text-primary);
  transition: all 0.2s;
}
.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.form-input::placeholder { color: var(--text-tertiary); }
.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%239aa0a6' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 32px;
  cursor: pointer;
}
.form-textarea { min-height: 80px; resize: vertical; }

/* ========================================
   Badges & Status
   ======================================== */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: var(--font-weight-medium);
}
.badge-success { background: var(--success-bg); color: var(--success); }
.badge-warning { background: var(--warning-bg); color: var(--warning); }
.badge-danger { background: var(--danger-bg); color: var(--danger); }
.badge-info { background: var(--info-bg); color: var(--info); }
.badge-neutral { background: var(--bg-hover); color: var(--text-secondary); }

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  display: inline-block;
  flex-shrink: 0;
}
.status-dot.online { background: var(--success); box-shadow: 0 0 6px rgba(52,199,89,0.5); }
.status-dot.offline { background: var(--text-tertiary); }
.status-dot.error { background: var(--danger); box-shadow: 0 0 6px rgba(255,59,48,0.5); }
.status-dot.warning { background: var(--warning); box-shadow: 0 0 6px rgba(255,159,10,0.5); }

/* ========================================
   Tables
   ======================================== */

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 13px; }
thead th {
  text-align: left;
  padding: 12px 16px;
  font-weight: var(--font-weight-medium);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-tertiary);
  border-bottom: 1px solid var(--border);
}
tbody td {
  padding: 12px 16px;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border);
}
tbody tr:hover { background: var(--bg-hover); }

/* ========================================
   Progress Bar
   ======================================== */

.progress { height: 6px; background: var(--border); border-radius: var(--radius-full); overflow: hidden; }
.progress-fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: var(--accent-gradient);
  transition: width 0.6s ease;
}
.progress-fill.success { background: var(--success); }
.progress-fill.warning { background: var(--warning); }
.progress-fill.danger { background: var(--danger); }

/* ========================================
   Modal
   ======================================== */

.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(4px);
  z-index: 500;
  align-items: center;
  justify-content: center;
}
.modal-overlay.open { display: flex; }
.modal-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  width: 90%;
  max-width: 480px;
  max-height: 85vh;
  overflow-y: auto;
  animation: modalSlideUp 0.25s ease;
}
@keyframes modalSlideUp {
  from { opacity: 0; transform: translateY(20px) scale(0.97); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}
.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}
.modal-header h3 { font-size: 16px; font-weight: var(--font-weight-semibold); }
.modal-close { background: none; border: none; color: var(--text-tertiary); font-size: 18px; padding: 4px; border-radius: var(--radius-sm); cursor: pointer; }
.modal-close:hover { color: var(--text-primary); background: var(--bg-hover); }
.modal-body { padding: 20px; }
.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 12px 20px;
  border-top: 1px solid var(--border);
}

/* ========================================
   Loading & States
   ======================================== */

.spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.loading-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  gap: 16px;
}
.loading-state p { font-size: 13px; color: var(--text-tertiary); }

.error-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  gap: 12px;
  text-align: center;
}
.error-state i { font-size: 40px; color: var(--danger); }
.error-state p { font-size: 14px; color: var(--text-secondary); }

.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 60px 20px;
  gap: 12px;
  text-align: center;
}
.empty-state i { font-size: 36px; color: var(--text-tertiary); }
.empty-state p { font-size: 14px; color: var(--text-secondary); }

/* ========================================
   Tabs
   ======================================== */

.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 20px; }
.tab {
  padding: 8px 16px;
  font-size: 13px;
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
  border: none;
  background: none;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.15s;
  margin-bottom: -1px;
}
.tab:hover { color: var(--text-primary); }
.tab.active { color: var(--accent); border-bottom-color: var(--accent); }

/* ========================================
   Grid Helpers
   ======================================== */

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.grid-12 { display: grid; grid-template-columns: repeat(12, 1fr); gap: 16px; }

.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-gap { display: flex; align-items: center; gap: 8px; }

/* ========================================
   Spacing
   ======================================== */

.mt-4 { margin-top: 8px; }
.mt-8 { margin-top: 16px; }
.mt-12 { margin-top: 24px; }
.mb-4 { margin-bottom: 8px; }
.mb-8 { margin-bottom: 16px; }
.mb-12 { margin-bottom: 24px; }
.mr-4 { margin-right: 8px; }
.ml-auto { margin-left: auto; }
.p-8 { padding: 16px; }
.p-12 { padding: 24px; }
.gap-2 { gap: 4px; }
.gap-4 { gap: 8px; }
.gap-8 { gap: 16px; }

/* ========================================
   Responsive
   ======================================== */

@media (max-width: 768px) {
  .topbar-nav { display: none; }
  .hamburger { display: inline-flex; align-items: center; justify-content: center; }
  .user-name { display: none; }

  .main-content { padding: 20px 16px; }
  .metrics-grid { grid-template-columns: repeat(2, 1fr); }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .grid-12 > * { grid-column: span 12 !important; }
}

@media (max-width: 480px) {
  .metrics-grid { grid-template-columns: 1fr; }
  .main-content { padding: 16px 12px; }
}