/* design tokens —— 从主题「计算机视觉」提取的视觉关键词：
   镜头蓝（聚焦/光路）、光圈琥珀（快门/警示）、像素灰阶（画布）、边缘线（细网格/描边）。
   亮暗两套独立取色（暗色不是简单反色）。 */

:root{
  --bg:#F6F7F9;
  --bg-raised:#FFFFFF;
  --bg-inset:#EDF0F4;
  --text:#1B2430;
  --text-soft:#46536A;
  --text-faint:#6B7A93;
  --line:#DDE2EA;
  --line-strong:#C6CEDA;
  --accent:#2451B3;          /* 镜头蓝 */
  --accent-strong:#173685;
  --accent-soft:#E4EBFB;
  --amber:#A05A00;           /* 光圈琥珀 */
  --focus:#2451B3;

  --lvl-entry:#1E7F4F;  --lvl-entry-bg:#E1F3E9;
  --lvl-core:#2451B3;   --lvl-core-bg:#E4EBFB;
  --lvl-adv:#A05A00;    --lvl-adv-bg:#FBEDDA;
  --lvl-front:#6B3FBF;  --lvl-front-bg:#EDE6FB;

  --ok:#1E7F4F;
  --learn:#A05A00;

  --tok-kw:#7A2FB8;
  --tok-str:#1E7F4F;
  --tok-com:#8B95A5;
  --tok-num:#B4550A;

  --radius:12px;
  --radius-s:8px;
  --shadow:0 1px 2px rgba(16,24,40,.05), 0 6px 18px rgba(16,24,40,.06);
  --speed:180ms;
  --ease:cubic-bezier(.2,.7,.3,1);

  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:"SF Mono",Menlo,Consolas,"JetBrains Mono","Courier New",monospace;
  color-scheme:light;
}

[data-theme="dark"]{
  --bg:#0F141C;
  --bg-raised:#161D29;
  --bg-inset:#1D2634;
  --text:#E3E8F1;
  --text-soft:#B3C0D4;
  --text-faint:#8593AB;
  --line:#28334A;
  --line-strong:#3C4A67;
  --accent:#8FB4FF;
  --accent-strong:#BCD4FF;
  --accent-soft:#1B2A4D;
  --amber:#F0B35C;
  --focus:#8FB4FF;

  --lvl-entry:#6FD3A0;  --lvl-entry-bg:#14301F;
  --lvl-core:#8FB4FF;   --lvl-core-bg:#182B50;
  --lvl-adv:#F0B35C;    --lvl-adv-bg:#3A2A10;
  --lvl-front:#C9A8F5;  --lvl-front-bg:#2C2049;

  --ok:#6FD3A0;
  --learn:#F0B35C;

  --tok-kw:#D6A6F7;
  --tok-str:#7FD8A6;
  --tok-com:#7C8899;
  --tok-num:#F0B35C;

  --shadow:0 1px 2px rgba(0,0,0,.45), 0 8px 22px rgba(0,0,0,.35);
  color-scheme:dark;
}