/* ===== base.css — CSS Variables, Reset, Typography (Light Theme) ===== */
:root {
  /* Colors — Clean Light Theme */
  --bg-primary: #f5f7fb;
  --bg-secondary: #ffffff;
  --bg-card: #ffffff;
  --bg-card-hover: #f8f9fc;
  --bg-sidebar: #ffffff;
  --bg-modal: #ffffff;
  --bg-input: #f1f3f6;
  --bg-input-focus: #ffffff;
  --border: rgba(0, 0, 0, 0.06);
  --border-light: rgba(0, 0, 0, 0.1);
  --border-focus: rgba(93, 180, 232, 0.45);

  /* Text */
  --text-primary: #1a1e2c;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --text-accent: #3a9fd4;

  /* Accent */
  --accent: #5db4e8;
  --accent-hover: #7fc5ed;
  --accent-bg: rgba(93, 180, 232, 0.1);
  --accent-border: rgba(93, 180, 232, 0.35);

  /* Status */
  --success: #10b981;
  --success-bg: rgba(16, 185, 129, 0.08);
  --warning: #f59e0b;
  --warning-bg: rgba(245, 158, 11, 0.08);
  --danger: #ef4444;
  --danger-bg: rgba(239, 68, 68, 0.08);
  --info: #3b82f6;
  --info-bg: rgba(59, 130, 246, 0.08);

  /* Spacing */
  --sidebar-w: 240px;
  --header-h: 64px;
  --radius: 10px;
  --radius-sm: 6px;
  --radius-lg: 14px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.08);
  --shadow-glow: 0 0 16px rgba(93, 180, 232, 0.12);

  /* Glass — transparent bg, no blur */
  --glass-bg: #ffffff;
  --glass-border: rgba(0, 0, 0, 0.06);
  --glass-blur: 0;

  /* Transitions */
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow: hidden;
}

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

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.08); border-radius: 3px; }

/* Typography */
h1 { font-size: 1.6rem; font-weight: 700; }
h2 { font-size: 1.3rem; font-weight: 600; }
h3 { font-size: 1.1rem; font-weight: 600; }
.text-muted { color: var(--text-muted); }
.text-secondary { color: var(--text-secondary); }
.text-accent { color: var(--text-accent); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger); }
.text-sm { font-size: 0.85rem; }
.text-xs { font-size: 0.75rem; }
.font-mono { font-family: 'SF Mono', 'Cascadia Code', 'Consolas', monospace; }