:root {
  /* ---- 色彩：按角色定义，暖中性色 ---- */
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #fbfbfc;
  --text: #16181d;
  --text-2: #4a5058;
  --muted: #6b7280;
  --line: #e7e9ee;
  --line-strong: #d8dbe2;

  --primary: #3b6fe0;
  --primary-hover: #2f5fc7;
  --primary-soft: #eaf0fd;
  --primary-text: #2551b8;

  --expense: #cf3f2b;
  --expense-soft: #fdeeeb;
  --income: #0f7f4d;
  --income-soft: #e8f7ef;
  --warn: #d97706;
  --warn-soft: #fef4e6;

  /* ---- 字号阶梯 1.25 ---- */
  --fs-xs: 12px;
  --fs-sm: 14px;
  --fs-base: 15px;
  --fs-lg: 18px;
  --fs-xl: 22px;
  --fs-2xl: 28px;
  --fs-3xl: 36px;

  /* ---- 间距 4/8 倍数 ---- */
  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 24px;
  --sp-6: 32px;
  --sp-7: 48px;

  /* ---- 圆角 ---- */
  --r-sm: 8px;
  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 20px;
  --r-full: 999px;

  /* ---- 阴影 ---- */
  --sh-1: 0 1px 2px rgba(22, 24, 29, .05);
  --sh-2: 0 2px 8px rgba(22, 24, 29, .06), 0 1px 2px rgba(22, 24, 29, .04);
  --sh-3: 0 8px 28px rgba(22, 24, 29, .10), 0 2px 6px rgba(22, 24, 29, .05);

  --font: -apple-system, BlinkMacSystemFont, "Inter", "PingFang SC", "HarmonyOS Sans SC", "MiSans", "Microsoft YaHei", system-ui, sans-serif;
  --font-num: "Inter", -apple-system, "SF Pro Display", "PingFang SC", system-ui, sans-serif;

  --nav-h: 60px;
  --ease: cubic-bezier(.2, .8, .2, 1);
}