:root {
  --bg: #050505;
  --bg-elevated: #0a0a0a;
  --bg-card: #0d0d0d;
  --bg-card-hover: #121212;
  --bg-sidebar: #070707;
  --bg-input: #0f0f0f;
  --bg-inset: #080808;

  --border: #1a1a1a;
  --border-strong: #252525;
  --border-focus: #3a3a3a;

  --text: #f5f5f5;
  --text-dim: #a0a0a0;
  --text-muted: #606060;
  --text-faint: #3a3a3a;

  --accent: #fafafa;
  --accent-dim: #d4d4d4;

  --success: #22c55e;
  --success-bg: rgba(34, 197, 94, 0.08);
  --success-border: rgba(34, 197, 94, 0.2);

  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.08);
  --danger-border: rgba(239, 68, 68, 0.2);

  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.08);

  --radius: 10px;
  --radius-sm: 7px;
  --radius-xs: 5px;

  --shadow: 0 4px 20px rgba(0, 0, 0, 0.5), 0 1px 2px rgba(0, 0, 0, 0.3);
  --transition: 140ms cubic-bezier(0.4, 0, 0.2, 1);

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', ui-monospace, monospace;
}

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

html, body { background: var(--bg); color: var(--text); }

body {
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.55;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "cv11", "ss01", "ss03";
  letter-spacing: -0.005em;
}

::selection { background: var(--accent); color: var(--bg); }

.login-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

.login-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 32px;
  width: 100%;
  max-width: 360px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.login-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}

.layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: 100vh;
}

.sidebar {
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  padding: 24px 0;
  display: flex;
  flex-direction: column;
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.logo {
  padding: 0 24px 28px;
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.logo-mark {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  background: linear-gradient(135deg, #2a2a2a, #0a0a0a);
  border: 1px solid var(--border-strong);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
  flex-shrink: 0;
}
.logo-mark svg { width: 16px; height: 16px; }

.logo-sub {
  font-size: 0.65rem;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 2px;
}

.nav-list { list-style: none; flex: 1; padding: 0 12px; }

.nav-item {
  padding: 9px 12px;
  margin: 1px 0;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.825rem;
  font-weight: 500;
  color: var(--text-dim);
  transition: color var(--transition), background var(--transition);
}
.nav-item:hover { background: var(--bg-card-hover); color: var(--text); }
.nav-item.active {
  background: var(--bg-card);
  color: var(--text);
  font-weight: 600;
  box-shadow: inset 0 0 0 1px var(--border);
}

.nav-footer {
  padding: 14px 22px;
  margin: 8px 12px 0;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.72rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 500;
}

.status-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--danger);
}
.status-dot.connected { background: var(--success); box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.15); }

.main { padding: 28px 36px 40px; overflow-y: auto; max-height: 100vh; }

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
.topbar h1 { font-size: 1.4rem; font-weight: 700; letter-spacing: -0.028em; }

.tab { display: none; animation: fadeIn 220ms ease; }
.tab.active { display: block; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 220px));
  gap: 12px;
  justify-content: start;
  margin-bottom: 28px;
}

.stat-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
}
.stat-value {
  font-size: 1.85rem;
  font-weight: 700;
  letter-spacing: -0.035em;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}
.stat-card.success .stat-value { color: var(--success); }
.stat-card.danger .stat-value { color: var(--danger); }
.stat-label {
  font-size: 0.7rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-top: 4px;
  font-weight: 500;
}

.usage-panel { display: flex; flex-direction: column; gap: 14px; }
.usage-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(165px, 1fr));
  gap: 12px;
}
.usage-window {
  background: var(--bg-inset);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
}
.usage-row, .usage-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.usage-row { color: var(--text-dim); font-size: 0.825rem; margin-bottom: 10px; }
.usage-row strong { color: var(--text); font-variant-numeric: tabular-nums; }
.usage-meta { color: var(--text-muted); font-size: 0.72rem; margin-top: 8px; }
.usage-fetched { justify-content: flex-end; }
.progress {
  height: 7px;
  background: var(--bg-input);
  border-radius: 999px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.progress span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--success), var(--warning));
  border-radius: inherit;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 20px;
  overflow: hidden;
}
.card-head {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.card-head h2 { font-size: 0.925rem; font-weight: 600; letter-spacing: -0.015em; }
.card-body { padding: 20px; }

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
  margin-bottom: 16px;
}
.form-field { display: flex; flex-direction: column; gap: 6px; }
.form-field.col-span-2 { grid-column: span 2; }
.form-field.col-span-3 { grid-column: 1 / -1; }
.form-field label { font-size: 0.75rem; font-weight: 500; color: var(--text-dim); }
.form-field input, .form-field select {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 9px 12px;
  color: var(--text);
  font-size: 0.825rem;
  font-family: var(--font);
  transition: var(--transition);
  outline: none;
  width: 100%;
}
.form-field textarea {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  padding: 9px 12px;
  color: var(--text);
  font-size: 0.825rem;
  font-family: var(--font-mono);
  transition: var(--transition);
  outline: none;
  width: 100%;
  resize: vertical;
  min-height: 80px;
  line-height: 1.5;
}
.form-field textarea:focus { border-color: var(--border-focus); background: var(--bg-card); }
.form-field textarea::placeholder { color: var(--text-faint); }
.form-field input:focus, .form-field select:focus { border-color: var(--border-focus); background: var(--bg-card); }
.form-field input::placeholder { color: var(--text-faint); }

.form-row { display: flex; align-items: center; gap: 10px; margin-top: 6px; flex-wrap: wrap; }
.form-msg { font-size: 0.775rem; font-weight: 500; }
.form-msg.success { color: var(--success); }
.form-msg.error { color: var(--danger); }

.btn {
  padding: 8px 14px;
  border-radius: var(--radius-xs);
  border: 1px solid transparent;
  font-size: 0.775rem;
  font-weight: 500;
  font-family: var(--font);
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}
.btn-primary { background: var(--accent); color: #000; font-weight: 600; border-color: var(--accent); }
.btn-primary:hover { background: #fff; transform: translateY(-0.5px); box-shadow: 0 4px 16px rgba(255,255,255,0.1); }
.btn-ghost { background: transparent; color: var(--text-dim); border: 1px solid var(--border); }
.btn-ghost:hover { background: var(--bg-card-hover); color: var(--text); border-color: var(--border-strong); }
.btn-danger-ghost { background: transparent; color: var(--text-muted); border: 1px solid var(--border); }
.btn-danger-ghost:hover { background: var(--danger-bg); color: var(--danger); border-color: var(--danger-border); }
.btn-sm { padding: 5px 10px; font-size: 0.72rem; }
.btn-full { width: 100%; justify-content: center; padding: 10px; }

.table { width: 100%; border-collapse: collapse; font-size: 0.8rem; }
.table thead th {
  text-align: left;
  padding: 9px 12px;
  color: var(--text-muted);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.68rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-inset);
}
.table tbody tr { transition: background var(--transition); }
.table tbody tr:hover { background: var(--bg-card-hover); }
.table tbody td { padding: 11px 12px; border-bottom: 1px solid var(--border); color: var(--text-dim); }
.table tbody tr:last-child td { border-bottom: none; }
.table tbody td code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--bg-input);
  padding: 2px 7px;
  border-radius: 4px;
  color: var(--text);
  border: 1px solid var(--border);
}
.empty { text-align: center; color: var(--text-faint); padding: 36px !important; font-size: 0.825rem; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 9px;
  border-radius: 999px;
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border: 1px solid transparent;
}
.badge-success { background: var(--success-bg); color: var(--success); border-color: var(--success-border); }
.badge-danger { background: var(--danger-bg); color: var(--danger); border-color: var(--danger-border); }
.badge-neutral { background: var(--bg-input); color: var(--text-dim); border-color: var(--border); }

.toast-container { position: fixed; bottom: 24px; right: 24px; display: flex; flex-direction: column; gap: 8px; z-index: 9999; }
.toast {
  padding: 11px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  font-weight: 500;
  animation: slideIn 200ms ease, fadeOut 220ms ease 2.7s forwards;
  border: 1px solid var(--border-strong);
  background: var(--bg-card);
  color: var(--text);
  box-shadow: var(--shadow);
}
.toast-success { border-color: var(--success-border); color: var(--success); }
.toast-error { border-color: var(--danger-border); color: var(--danger); }

@keyframes slideIn { from { opacity: 0; transform: translateX(16px); } to { opacity: 1; transform: translateX(0); } }
@keyframes fadeOut { from { opacity: 1; } to { opacity: 0; transform: translateX(16px); } }

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 3px; }

/* Hamburger button - hidden on desktop */
.hamburger {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  color: var(--text-dim);
  cursor: pointer;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: var(--transition);
}
.hamburger:hover { background: var(--bg-card-hover); color: var(--text); border-color: var(--border-strong); }
.hamburger svg { width: 18px; height: 18px; }

/* Sidebar overlay backdrop */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  z-index: 99;
  backdrop-filter: blur(2px);
}
.sidebar-overlay.active { display: block; }

/* Table responsive wrapper */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 260px;
    height: 100vh;
    z-index: 100;
    transform: translateX(-100%);
    transition: transform 250ms cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: none;
  }
  .sidebar.open {
    transform: translateX(0);
    box-shadow: 4px 0 24px rgba(0, 0, 0, 0.5);
  }

  .hamburger { display: inline-flex; }

  .main { padding: 16px; max-height: none; height: auto; min-height: 100vh; }

  .topbar { margin-bottom: 20px; padding-bottom: 14px; gap: 12px; }
  .topbar h1 { font-size: 1.15rem; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; margin-bottom: 20px; }
  .stat-card { padding: 14px 16px; }
  .stat-value { font-size: 1.4rem; }

  .card-body { padding: 14px; }
  .card-head { padding: 12px 14px; }

  .form-grid { grid-template-columns: 1fr; gap: 10px; }
  .form-field.col-span-2,
  .form-field.col-span-3 { grid-column: 1; }

  .form-row { flex-direction: column; align-items: stretch; gap: 8px; }
  .form-row .btn { width: 100%; justify-content: center; }

  .table { font-size: 0.72rem; }
  .table thead th { padding: 7px 8px; font-size: 0.62rem; }
  .table tbody td { padding: 9px 8px; }

  .key-row { flex-wrap: wrap; }
  .key-value { font-size: 0.75rem; padding: 6px 10px; }

  .toggle-row { flex-direction: column; align-items: flex-start; gap: 10px; padding: 14px 0; }
  .toggle-row .switch { align-self: flex-end; }

  .settings-nav { overflow-x: auto; gap: 0; }
  .settings-tab { padding: 10px 14px; font-size: 0.75rem; white-space: nowrap; }

  .toast-container { bottom: 16px; right: 16px; left: 16px; }
  .toast { font-size: 0.75rem; }

  .modal-card { width: 95vw; max-height: 90vh; }
  .modal-head { padding: 14px 16px; }
  .modal-body { padding: 14px 16px; }
  .modal-foot { padding: 12px 16px; }

  .nav-footer { padding: 12px 16px; }
}

.key-row {
  display: flex;
  align-items: center;
  gap: 8px;
}
.key-value {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text);
  background: var(--bg-inset);
  padding: 8px 12px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--border);
  word-break: break-all;
  flex: 1;
}
.api-key-display { display: flex; flex-direction: column; gap: 16px; }

.toggle-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.toggle-row:last-of-type { border-bottom: none; }

.switch {
  position: relative;
  display: inline-block;
  width: 44px;
  height: 24px;
}
.switch input { opacity: 0; width: 0; height: 0; }
.slider {
  position: absolute;
  cursor: pointer;
  inset: 0;
  background: var(--bg-input);
  border: 1px solid var(--border-strong);
  border-radius: 24px;
  transition: var(--transition);
}
.slider::before {
  content: '';
  position: absolute;
  height: 18px;
  width: 18px;
  left: 2px;
  bottom: 2px;
  background: var(--text-dim);
  border-radius: 50%;
  transition: var(--transition);
}
.switch input:checked + .slider { background: var(--success-bg); border-color: var(--success-border); }
.switch input:checked + .slider::before { transform: translateX(20px); background: var(--success); }

.btn-danger {
  background: var(--danger-bg);
  color: var(--danger);
  border: 1px solid var(--danger-border);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 500;
  transition: var(--transition);
}
.btn-danger:hover { background: rgba(239, 68, 68, 0.15); }

.form-row { display: flex; align-items: center; gap: 12px; margin-top: 12px; }
.form-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 12px; }

.nav-bottom {
  padding: 8px 12px;
  border-top: 1px solid var(--border);
}
.nav-bottom .nav-item {
  padding: 9px 14px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.82rem;
  color: var(--text-dim);
  transition: var(--transition);
}
.nav-bottom .nav-item:hover { background: var(--bg-card-hover); color: var(--text); }
.nav-bottom .nav-item.active { background: var(--bg-card); color: var(--text); }

.settings-nav {
  display: flex;
  gap: 4px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0;
}
.settings-tab {
  padding: 10px 18px;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
  font-family: var(--font);
}
.settings-tab:hover { color: var(--text); }
.settings-tab.active { color: var(--text); border-bottom-color: var(--text); }

.settings-panel { display: none; }
.settings-panel.active { display: block; }

.toggle-info { flex: 1; }
.toggle-title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
  font-size: 0.88rem;
}
.toggle-title svg { width: 16px; height: 16px; color: var(--text-dim); }
.toggle-subtitle { font-weight: 400; color: var(--text-dim); font-size: 0.78rem; }
.toggle-desc { color: var(--text-muted); font-size: 0.78rem; margin-top: 4px; margin-left: 24px; }
.hint { color: var(--text-muted); font-size: 0.78rem; }

.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 12px 0;
}
.pagination-info {
  color: var(--text-dim);
  font-size: 0.82rem;
}
.copy-model-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  margin-left: 8px;
  vertical-align: middle;
  cursor: pointer;
  opacity: 0.4;
  transition: opacity 0.15s;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: transparent;
  color: var(--text-dim);
}
.copy-model-btn:hover { opacity: 1; background: var(--bg-card-hover); }
.copy-model-btn svg { width: 13px; height: 13px; }

.modal {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(4px);
}
.modal-card {
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  width: min(560px, 92vw);
  max-height: 86vh;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow);
}
.modal-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}
.modal-head h3 { font-size: 0.95rem; font-weight: 600; }
.modal-close {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 1.5rem;
  cursor: pointer;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-xs);
}
.modal-close:hover { background: var(--bg-card-hover); color: var(--text); }
.modal-body { padding: 16px 20px; overflow-y: auto; flex: 1; }
.modal-hint { color: var(--text-dim); font-size: 0.8rem; margin-bottom: 14px; line-height: 1.5; }
.modal-hint strong { color: var(--text); font-weight: 600; }
.modal-foot {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  padding: 14px 20px;
  border-top: 1px solid var(--border);
}
.models-checklist {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.models-checklist label {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: var(--radius-xs);
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition);
}
.models-checklist label:hover { background: var(--bg-card-hover); border-color: var(--border); }
.models-checklist input[type="checkbox"] { accent-color: var(--success); width: 16px; height: 16px; cursor: pointer; }
.models-checklist .model-name { font-family: var(--font-mono); font-size: 0.82rem; color: var(--text); }
.models-checklist .model-tier {
  margin-left: auto;
  font-size: 0.7rem;
  color: var(--text-dim);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.models-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
.models-tab {
  padding: 10px 20px;
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: var(--transition);
  font-family: var(--font);
}
.models-tab:hover { color: var(--text); }
.models-tab.active { color: var(--text); border-bottom-color: var(--accent); }