/* ============================================
   Dashboard Chrome/VPN - Dark Theme
   ============================================ */

:root {
  --bg-primary: #1a1a2e;
  --bg-secondary: #16213e;
  --bg-card: #0f3460;
  --bg-input: #1a1a3e;
  --text-primary: #e8e8e8;
  --text-secondary: #a8a8b8;
  --text-muted: #6c6c7c;
  --accent: #4fc3f7;
  --accent-hover: #29b6f6;
  --success: #4caf50;
  --danger: #f44336;
  --warning: #ff9800;
  --border: #2a2a4e;
  --shadow: rgba(0, 0, 0, 0.3);
  --radius: 8px;
  --radius-lg: 12px;
  --transition: 0.2s ease;
}

/* Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3 {
  color: var(--text-primary);
  font-weight: 600;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* ============================================
   Header
   ============================================ */

.header {
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1400px;
  margin: 0 auto;
}

.header-title {
  font-size: 1.25rem;
  white-space: nowrap;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.user-info {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.25rem;
  border: none;
  border-radius: var(--radius);
  font-size: 0.9375rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  min-height: 44px;
  min-width: 44px;
  text-decoration: none;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-primary {
  background-color: var(--accent);
  color: #000;
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--accent-hover);
}

.btn-secondary {
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border);
}

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

.btn-danger {
  background-color: var(--danger);
  color: #fff;
}

.btn-danger:hover:not(:disabled) {
  background-color: #d32f2f;
}

.btn-success {
  background-color: var(--success);
  color: #fff;
}

.btn-success:hover:not(:disabled) {
  background-color: #388e3c;
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: 0.8125rem;
  min-height: 36px;
}

.btn-full {
  width: 100%;
}

.btn-icon {
  padding: 0.5rem;
  min-width: 44px;
  min-height: 44px;
}

.btn-text { display: inline; }
.btn-loading { display: none; }
.btn-loading.visible { display: inline-flex; align-items: center; gap: 0.5rem; }
.btn.loading .btn-text { display: none; }
.btn.loading .btn-loading { display: inline-flex; align-items: center; gap: 0.5rem; }

/* ============================================
   Connection Banner
   ============================================ */

.connection-banner {
  background-color: var(--danger);
  color: #fff;
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
}

.connection-banner.hidden {
  display: none;
}

/* ============================================
   Main Content
   ============================================ */

.main-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem;
}

.actions-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
}

.instance-count {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

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

.loading-state,
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 2rem;
  color: var(--text-secondary);
}

.loading-state.hidden,
.empty-state.hidden {
  display: none;
}

.empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.empty-hint {
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* ============================================
   Spinner
   ============================================ */

.spinner {
  display: inline-block;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.spinner-large {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 1rem;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ============================================
   Instance Grid
   ============================================ */

.instance-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.25rem;
}

.instance-grid.hidden {
  display: none;
}

/* ============================================
   Instance Card
   ============================================ */

.instance-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  transition: border-color var(--transition);
}

.instance-card:hover {
  border-color: var(--accent);
}

.card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.card-title {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 1.0625rem;
  font-weight: 600;
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.status-dot.running { background-color: var(--success); }
.status-dot.stopped { background-color: var(--danger); }
.status-dot.error { background-color: var(--warning); }
.status-dot.unknown { background-color: var(--text-muted); }

.card-status {
  font-size: 0.75rem;
  text-transform: uppercase;
  font-weight: 600;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}

.card-status.running { color: var(--success); background: rgba(76, 175, 80, 0.1); }
.card-status.stopped { color: var(--danger); background: rgba(244, 67, 54, 0.1); }
.card-status.error { color: var(--warning); background: rgba(255, 152, 0, 0.1); }

.card-body {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.card-info {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.info-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.875rem;
}

.info-label {
  color: var(--text-secondary);
}

.info-value {
  color: var(--text-primary);
  font-family: 'Courier New', monospace;
}

.info-value a {
  color: var(--accent);
}

.url-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.copy-btn {
  background: none;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  cursor: pointer;
  font-size: 0.75rem;
  min-height: 28px;
  min-width: 44px;
  transition: all var(--transition);
}

.copy-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.copy-btn.copied {
  border-color: var(--success);
  color: var(--success);
}

/* VPN Info */
.vpn-info {
  background-color: var(--bg-primary);
  border-radius: var(--radius);
  padding: 0.75rem;
  font-size: 0.8125rem;
}

.vpn-info .info-row {
  font-size: 0.8125rem;
}

.vpn-status {
  display: flex;
  align-items: center;
  gap: 0.375rem;
}

.vpn-status.connected { color: var(--success); }
.vpn-status.disconnected { color: var(--danger); }
.vpn-status.loading { color: var(--text-muted); }

/* Card Actions */
.card-actions {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

.card-actions .btn {
  flex: 1;
  font-size: 0.8125rem;
  padding: 0.625rem 0.75rem;
}

/* ============================================
   Dialog
   ============================================ */

.dialog-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 1rem;
}

.dialog-overlay.hidden {
  display: none;
}

.dialog {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  max-width: 400px;
  width: 100%;
}

.dialog-title {
  font-size: 1.125rem;
  margin-bottom: 0.75rem;
}

.dialog-message {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  font-size: 0.9375rem;
}

.dialog-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: flex-end;
}

/* ============================================
   Toast
   ============================================ */

.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--bg-card);
  color: var(--text-primary);
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  font-size: 0.875rem;
  z-index: 2000;
  animation: fadeIn 0.2s ease;
}

.toast.hidden {
  display: none;
}

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

@keyframes fadeIn {
  from { opacity: 0; transform: translateX(-50%) translateY(10px); }
  to { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* ============================================
   Login Page
   ============================================ */

.login-page {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 1rem;
}

.login-container {
  width: 100%;
  max-width: 400px;
}

.login-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
}

.login-header {
  text-align: center;
  margin-bottom: 2rem;
}

.login-header h1 {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}

.login-header p {
  color: var(--text-secondary);
  font-size: 0.875rem;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.form-group label {
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.form-group input {
  padding: 0.75rem 1rem;
  background-color: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 1rem;
  min-height: 44px;
  transition: border-color var(--transition);
}

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

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

.error-message {
  color: var(--danger);
  font-size: 0.875rem;
  min-height: 1.25rem;
  text-align: center;
}

/* ============================================
   Utility Classes
   ============================================ */

.hidden {
  display: none !important;
}

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

@media (max-width: 768px) {
  html {
    font-size: 16px;
  }

  .header-content {
    flex-wrap: wrap;
    gap: 0.5rem;
  }

  .header-title {
    font-size: 1.125rem;
  }

  .main-content {
    padding: 1rem;
  }

  .instance-grid {
    grid-template-columns: 1fr;
  }

  .actions-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
  }

  .instance-count {
    text-align: center;
  }

  .btn {
    min-height: 44px;
    min-width: 44px;
  }

  .card-actions {
    flex-direction: column;
  }

  .card-actions .btn {
    min-height: 44px;
  }

  .dialog-actions {
    flex-direction: column-reverse;
  }

  .dialog-actions .btn {
    width: 100%;
  }

  .copy-btn {
    min-height: 44px;
    min-width: 44px;
    padding: 0.5rem 0.75rem;
  }
}

@media (max-width: 480px) {
  .login-card {
    padding: 1.5rem;
  }

  .header {
    padding: 0.75rem 1rem;
  }

  .user-info {
    display: none;
  }
}

/* ============================================
   Accessibility
   ============================================ */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* Skip link for keyboard navigation */
.skip-link {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--accent);
  color: #000;
  padding: 0.5rem 1rem;
  z-index: 9999;
}

.skip-link:focus {
  top: 0;
}

/* ============================================
   Form Select
   ============================================ */

.form-select {
  width: 100%;
  padding: 0.75rem 1rem;
  background-color: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 1rem;
  min-height: 44px;
  cursor: pointer;
  transition: border-color var(--transition);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%23a8a8b8' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10l-5 5z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
}

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

.form-select option {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
}