:root{--bg:#f6f7fb;--surface:#fff;--soft:#f0f1f8;--text:#20213a;--muted:#777a91;--line:#e8e9f2;--primary:#5b5ce2;--primary-dark:#3e3fb7;--yellow:#ffd767;--shadow:0 18px 50px rgba(54,55,104,.09);font-family:"Microsoft YaHei","PingFang SC",system-ui,sans-serif;color:var(--text);background:var(--bg)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--text)}button,input{font:inherit}button{color:inherit}.app-shell{min-height:100vh}.sidebar{position:fixed;inset:0 auto 0 0;width:244px;padding:26px 18px 20px;display:flex;flex-direction:column;background:#24243d;color:#fff;z-index:30}.brand{display:flex;align-items:center;gap:11px;padding:0 8px;color:#fff;text-decoration:none;font-size:20px;font-weight:800}.brand>span:last-child{display:grid}.brand small{margin-top:2px;color:#9292ab;font-size:9px;font-weight:500;letter-spacing:.06em}.brand-mark{display:grid!important;place-items:center;width:41px;height:41px;border-radius:14px;background:var(--yellow);color:#302e4a;box-shadow:0 8px 22px rgba(255,215,103,.18);transform:rotate(-5deg)}.main-nav{display:grid;gap:7px;margin-top:42px}.nav-item{display:flex;align-items:center;gap:13px;min-height:48px;padding:0 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body.dark{--bg:#171722;--surface:#232332;--soft:#2c2c3e;--text:#f2f2f7;--muted:#a4a4b4;--line:#363648}body.dark .topbar{background:rgba(23,23,34,.88)}body.dark .daily-card{background:#423a28}body.dark .daily-card p,body.dark .daily-head{color:#c9b985}body.dark .skill-card{color:#29293e}body.dark .lesson-grid section{background:#2c2c3e}body.dark .practice-box{background:#423a28}
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.site-footer{display:flex;justify-content:center;align-items:center;gap:14px;margin-top:48px;padding-top:20px;border-top:1px solid var(--line);color:var(--muted);font-size:9px}.site-footer a{color:var(--muted);text-decoration:none}.site-footer a:hover{color:var(--primary)}@media(max-width:520px){.site-footer{flex-direction:column;gap:6px}}