/* Dark course shell -> site light theme */
:root:root:root{--bg:#f2f6ea;--panel:#fbfcf8;--panel2:#e8ede0;--line:#d5d9cb;--text:#232220;--muted:#6f6e66;
  --accent:#3e6fb0;--green:#2f7d5f;--amber:#a8701a;--red:#b8452f;--purple:#6b4fa8;--cyan:#1f7f86;--pink:#a8366f;--code:#f7f9f2;
  color-scheme:light}
body{font-family:"Switzer",system-ui,sans-serif;font-size:15px;line-height:1.6}
h1,h2,.model-card h3{font-family:"Switzer",system-ui,sans-serif;font-weight:400;letter-spacing:-.02em}
h1{font-size:clamp(34px,4.4vw,48px);line-height:1.04}
h2{font-size:28px;line-height:1.1}
h3{font-weight:500}
.brand{font-family:"Switzer",system-ui,sans-serif;font-weight:400;font-size:20px}
.brand b{color:var(--text);font-weight:400}
.top,aside,.detail,.search-results{background:#f2f6ea}
.top input,.file-filter input,.code-head input{background:#fff}
.pill:hover,.pill.active{background:#e6ecd8;color:var(--text)}
.step-chip.active{background:#dfece9}
.debug-case .symptom{color:#8a4a12}
.code-line .ln{color:#a3a296;border-right-color:#e1e5d6}
.code-line.mark{background:#f6ecc9}
.code-line.focus{background:#dfe8f4}
.callout{background:#f4ead2}
.detail .refs{grid-template-columns:minmax(0,1fr)}
#drawerCode,.drawer-code{min-width:0;max-width:100%}
.overlay{background:rgba(35,34,32,.22)}
.detail{box-shadow:-24px 0 48px rgba(35,34,32,.08)}
.stage,.card,.math-card,.fact,.model-card,.debug-case,.quiz button,.stepper{box-shadow:none}
.lane-title,.nav-group,th,.badge,.eyebrow,.fam,.stage em,code,.code-scroll,.drawer-code,.file-btn,.ref-row code,.formula .note,.step-shape{font-family:"Fragment Mono",ui-monospace,monospace}
.formula{font-family:"Switzer",system-ui,sans-serif}
.code-line.omit .txt{color:#85847c;font-style:italic}
::-webkit-scrollbar-track{background:#eef2e6}
::-webkit-scrollbar-thumb{background:#c9cdbd;border-color:#eef2e6}
::-webkit-scrollbar-thumb:hover{background:#b0b4a3}
*{scrollbar-color:#c9cdbd #eef2e6}