:root {
  --color-bg: #0d1117;
  --color-surface: #161b22;
  --color-surface-hover: #1c2333;
  --color-border: #30363d;
  --color-text: #e6edf3;
  --color-text-muted: #8b949e;
  --color-accent: #58a6ff;
  --color-accent-glow: rgba(88, 166, 255, 0.4);
  --color-dynasty: #f0883e;
  --color-dynasty-active: #ffa657;
  --color-danger: #f85149;
  --color-success: #3fb950;
  --font-sans: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Cascadia Code", Consolas, monospace;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --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 24px rgba(0, 0, 0, 0.5);
  --transition-fast: 150ms ease;
  --transition-normal: 300ms ease;
  --color-scheme: dark;
}

[data-theme="light"] {
  --color-bg: #ffffff;
  --color-surface: #f6f8fa;
  --color-surface-hover: #eef1f5;
  --color-border: #d0d7de;
  --color-text: #1f2328;
  --color-text-muted: #656d76;
  --color-accent: #0969da;
  --color-accent-glow: rgba(9, 105, 218, 0.2);
  --color-dynasty: #bd6200;
  --color-dynasty-active: #d4731a;
  --color-danger: #cf222e;
  --color-success: #1a7f37;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
  --color-scheme: light;
}

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

html, body {
  height: 100%;
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.5;
  color-scheme: var(--color-scheme);
}

#app {
  display: flex;
  flex-direction: column;
  height: 100%;
  width: 100%;
}

/* ===== Header ===== */
#header,
.page-header {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 16px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

#header h1,
.page-header h1 {
  font-size: 16px;
  font-weight: 700;
  color: var(--color-accent);
  flex-shrink: 0;
}

#header a,
.page-header a {
  font-size: 12px;
  color: var(--color-text-muted);
  text-decoration: none;
}

#header a:hover,
.page-header a:hover {
  color: var(--color-accent);
}

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

/* ===== Theme Toggle ===== */
#theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  width: 30px;
  height: 26px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast), color var(--transition-fast);
  flex-shrink: 0;
  line-height: 1;
}

#theme-toggle:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

/* ===== Footer ===== */
#copyright {
  flex-shrink: 0;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  font-size: 10px;
  color: var(--color-text-muted);
}

/* ===== Loading ===== */
#loading {
  text-align: center;
  padding: 60px 0;
  color: var(--color-text-muted);
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

#loading.hidden {
  display: none;
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin-bottom: 12px;
}

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

/* ===== Responsive ===== */
@media (max-width: 480px) {
  .page-header {
    padding: 6px 12px;
    gap: 10px;
  }
  .page-header h1 {
    font-size: 14px;
  }
  .page-header a,
  .header-right a {
    font-size: 11px;
  }
  .header-right {
    gap: 8px;
  }
  #theme-toggle {
    width: 28px;
    height: 24px;
    font-size: 12px;
  }
}