:root,
[data-theme="light"] {
  --color-bg: #ffffff;
  --color-bg-secondary: #f5f5f5;
  --color-bg-tertiary: #e8e8e8;
  --color-text: #1a1a1a;
  --color-text-secondary: #666666;
  --color-primary: #4a90d9;
  --color-primary-hover: #357abd;
  --color-border: #d0d0d0;
  --color-sidebar-bg: #f5f7fa;
  --color-sidebar-hover: #e8edf5;
  --color-sidebar-active: #e0edff;
  --color-toggle-bg: #d0d0d0;
  --color-toggle-indicator: #ffffff;
  --color-error: #c0392b;
  --color-warn: #e67e22;
  --color-success: #27ae60;
}

[data-theme="dark"] {
  --color-bg: #1a1a2e;
  --color-bg-secondary: #16213e;
  --color-bg-tertiary: #0f3460;
  --color-text: #e0e0e0;
  --color-text-secondary: #a0a0a0;
  --color-primary: #5dade2;
  --color-primary-hover: #3498db;
  --color-border: #2c2c4a;
  --color-sidebar-bg: #16213e;
  --color-sidebar-hover: #1a2a4a;
  --color-sidebar-active: #1a2d50;
  --color-toggle-bg: #0f3460;
  --color-toggle-indicator: #5dade2;
  --color-error: #e74c3c;
  --color-warn: #f39c12;
  --color-success: #2ecc71;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #1a1a2e;
    --color-bg-secondary: #16213e;
    --color-bg-tertiary: #0f3460;
    --color-text: #e0e0e0;
    --color-text-secondary: #a0a0a0;
    --color-primary: #5dade2;
    --color-primary-hover: #3498db;
    --color-border: #2c2c4a;
    --color-sidebar-bg: #16213e;
    --color-sidebar-hover: #1a2a4a;
    --color-sidebar-active: #1a2d50;
    --color-toggle-bg: #0f3460;
    --color-toggle-indicator: #5dade2;
    --color-error: #e74c3c;
    --color-warn: #f39c12;
    --color-success: #2ecc71;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
}

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

a:hover {
  color: var(--color-primary-hover);
}

/* Loading Spinner */
.sg-loading-screen__spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: sg-spin 0.8s linear infinite;
}

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