:root {
  --bg-app: #f8fafc;
  --bg-card: #ffffff;
  --bg-sub: #f1f5f9;
  --bg-hover: #e2e8f0;
  
  --fg-main: #0f172a;
  --fg-muted: #64748b;
  --fg-subtle: #94a3b8;
  
  --brand: #2563eb;
  --brand-hover: #1d4ed8;
  --brand-light: #eff6ff;
  --brand-border: #bfdbfe;
  
  --success: #10b981;
  --success-bg: #ecfdf5;
  --success-border: #a7f3d0;
  
  --warning: #f59e0b;
  --warning-bg: #fffbeb;
  --warning-border: #fde68a;
  
  --danger: #ef4444;
  --danger-bg: #fef2f2;
  --danger-border: #fecaca;
  
  --border: #e2e8f0;
  --border-color: #e2e8f0;
  --border-dark: #cbd5e1;
  --font-mono: 'JetBrains Mono', ui-monospace, Menlo, Monaco, Consolas, monospace;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 18px;
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg-app);
  color: var(--fg-main);
  line-height: 1.5;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}
code, pre, .font-mono {
  font-family: 'JetBrains Mono', ui-monospace, Menlo, monospace;
}

main {
  max-width: 1120px;
  margin: 28px auto;
  padding: 0 20px;
}

header {
  background: #0f172a;
  color: #ffffff;
  padding: 0 24px;
  height: 60px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid #1e293b;
  position: sticky;
  top: 0;
  z-index: 50;
}
.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.2px;
  color: #f8fafc;
}
.brand-icon {
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, #3b82f6, #1d4ed8);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.4);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}
.dev-pill {
  background: rgba(245, 158, 11, 0.15);
  border: 1px solid rgba(245, 158, 11, 0.35);
  color: #fbbf24;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.hidden, body .hidden, div.hidden {
  display: none !important;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--fg-muted);
  font-weight: 500;
  font-size: 13px;
  cursor: pointer;
  margin-bottom: 14px;
  transition: color 0.15s ease;
}
.back-btn:hover { color: var(--brand); }

/* 代码展示盒 */
.code-box {
  background: #0f172a;
  color: #e2e8f0;
  border-radius: var(--radius-md);
  padding: 14px;
  font-size: 12.5px;
  font-family: 'JetBrains Mono', monospace;
  white-space: pre-wrap;
  word-break: break-all;
  max-height: 240px;
  overflow-y: auto;
  border: 1px solid #1e293b;
  position: relative;
}

/* 登录卡片 */
#login-view {
  max-width: 400px;
  margin: 12vh auto;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: var(--shadow-lg);
}

/* 内联 SVG 图标系统 */
.ico {
  width: 15px;
  height: 15px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  vertical-align: -2px;
}
.ico-lg { width: 20px; height: 20px; }
.ico-sm { width: 13px; height: 13px; }