/* design tokens — 视觉关键词：蓝图 · 结构图 · 连线 · 深空蓝 */
:root{
  --bg:#F5F8FC; --surface:#FFFFFF; --surface-2:#EDF2F9;
  --ink:#1B2734; --ink-soft:#4F6379;
  --line:#D8E2EE; --line-strong:#B7C8DC;
  --primary:#1D5FE0; --primary-ink:#FFFFFF; --primary-soft:#E3ECFD;
  --accent:#0E9384; --good:#0B7A55; --warn:#A15C07; --bad:#B42334;
  --lvl-intro:#08744F; --lvl-core:#1D5FE0; --lvl-adv:#A34E03; --lvl-frontier:#6D28D9;
  --m1:#2E6BE6; --m2:#0E8FA8; --m3:#7443D6; --m4:#C26A03; --m5:#C23A62; --m6:#0F8A50; --m7:#54627A;
  --font-sans:system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --radius-s:8px; --radius:12px; --radius-l:18px;
  --shadow-s:0 1px 2px rgba(16,32,56,.06);
  --shadow:0 10px 30px rgba(16,32,56,.10);
  --motion:180ms cubic-bezier(.2,.7,.3,1);
  --grid:rgba(29,95,224,.08);
}
[data-theme="dark"]{
  --bg:#0A1220; --surface:#111C2E; --surface-2:#18263C;
  --ink:#E8EFF8; --ink-soft:#A3B5CB;
  --line:#25344C; --line-strong:#3A4E6E;
  --primary:#8FB4FF; --primary-ink:#0A1220; --primary-soft:#1B2E4D;
  --accent:#3BD6C2; --good:#4ADE9E; --warn:#F5B851; --bad:#FF8A97;
  --lvl-intro:#4ADE9E; --lvl-core:#8FB4FF; --lvl-adv:#F5B851; --lvl-frontier:#C4A9FF;
  --m1:#7FA9FF; --m2:#5BC6DB; --m3:#B298FF; --m4:#F0A75A; --m5:#F383A5; --m6:#5FD39A; --m7:#93A5C0;
  --shadow-s:0 1px 2px rgba(0,0,0,.5);
  --shadow:0 12px 34px rgba(0,0,0,.45);
  --grid:rgba(143,180,255,.09);
}