:root{--nextra-primary-hue:158deg;--nextra-primary-saturation:48%;--nextra-primary-lightness:28%;--nextra-bg:250,250,247;--nextra-content-width:96rem;--reading-size:19px}html[data-large=true]{--reading-size:22px}body{color:#273e38;background:#fafaf7;font-family:PingFang SC,Microsoft YaHei,sans-serif}.brand{display:flex;align-items:center;gap:8px;font-size:18px;letter-spacing:-.5px}.brand i{background:#235849;color:white;padding:5px 10px;border-radius:3px;font:italic 700 22px Georgia}.brand b{font-weight:400;color:#487467}main{max-width:960px!important}main li,main p{font-size:var(--reading-size);line-height:1.95}main h1{font-family:Songti SC,"Noto Serif CJK SC",serif;font-size:clamp(30px,4vw,43px)!important;line-height:1.45!important;letter-spacing:-1px;margin-top:20px!important}main h2{font-size:27px!important;margin-top:64px!important;padding-top:22px!important;border-top:1px solid #d9e2dc}main h3{font-size:22px!important}main blockquote{background:#edf2ec;border-left:3px solid #648874;padding:14px 22px;color:#42574e}main table{font-size:17px;line-height:1.8}.reader-tools{display:flex;align-items:center;justify-content:space-between;gap:12px;border-bottom:1px solid #d9e2dc;padding:18px 0;color:#526f60;font-size:14px}.prompt button,.reader-tools button{border:1px solid #b4c7ba;border-radius:6px;padding:8px 14px;background:#fff;color:#244f3f;cursor:pointer;min-height:44px}.prototype-note{font-size:14px!important;color:#6b716d;border-left:3px solid #bd934b;padding:10px 16px;background:#f5f0e5;margin:24px 0}.lesson-figure{margin:30px 0}.image-open{position:relative;display:block;width:100%;cursor:zoom-in;border:1px solid #dce2dc;border-radius:8px;overflow:hidden;background:white}.image-open img{display:block;max-width:100%;margin:auto}.image-open span{display:block;text-align:right;padding:10px 16px;font-size:14px;color:#365b49;background:#eef2ec}figcaption{font-size:13px;color:#777;margin-top:8px}.prompt{margin:26px 0;border:1px solid #ccdace;border-radius:10px;overflow:hidden;background:#f0f4ed}.prompt>div{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 18px;border-bottom:1px solid #d9e2dc;font-size:14px}.prompt pre{padding:22px;white-space:pre-wrap;overflow-wrap:anywhere;font:17px/1.9 PingFang SC,Microsoft YaHei,sans-serif;color:#2f4438}.sr-status{position:absolute;width:1px;height:1px;overflow:hidden}html:has(.image-dialog[open]){overflow:hidden}.image-dialog{position:fixed;inset:0;width:100vw;max-width:none;height:100dvh;max-height:none;margin:0;padding:0;border:0;border-radius:0;background:transparent;color:white;overflow:hidden}.image-dialog::-webkit-backdrop{background:rgba(12,17,20,.88)}.image-dialog::backdrop{background:rgba(12,17,20,.88)}.image-controls{position:absolute;z-index:2;top:max(16px,env(safe-area-inset-top));right:max(20px,env(safe-area-inset-right));display:flex;gap:10px}.image-controls button{min-height:44px;padding:8px 16px;border:1px solid #ffffff50;border-radius:24px;background:#252a2e;color:white;font-size:15px;cursor:pointer}.image-controls button:hover{background:#42494e}.image-stage{position:absolute;inset:76px 32px;display:flex;align-items:center;justify-content:center;overflow:auto;overscroll-behavior:contain}.image-stage img{display:block;flex:none;width:auto;height:auto;max-width:100%;max-height:100%;margin:0;object-fit:contain;box-shadow:0 12px 60px #0006}.image-stage.zoomed{display:block}.image-stage.zoomed img{max-width:none;max-height:none;margin:auto}@media(max-width:700px){.image-stage{inset:76px 12px}.image-controls{right:12px}.image-controls button{font-size:14px}}button:focus-visible{outline:3px solid #a57b32;outline-offset:3px}@media(max-width:700px){main h2{font-size:23px!important;margin-top:44px!important}.prompt>div{align-items:flex-start;flex-direction:column}.prompt pre{padding:16px;font-size:16px}.reader-tools{font-size:12px}main li,main p{line-height:1.85}}