:root{color-scheme:light;--level-ink:#2c4335;--level-muted:#788578;--level-green:#347951;--level-line:#dce6da;--level-background:#f6f8f2}*{box-sizing:border-box}body{margin:0;background:var(--level-background);color:var(--level-ink);font:15px/1.6 system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif}a{color:var(--level-green);text-decoration:none}button{font:inherit;cursor:pointer}button,a,summary{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid #c79830;outline-offset:4px}.topbar{min-height:70px;display:flex;align-items:center;justify-content:space-between;gap:20px;padding:15px max(24px,calc((100vw - 1000px)/2));background:#fff;border-bottom:1px solid var(--level-line)}.brand{font-size:20px;font-weight:600;white-space:nowrap}.level-navigation{display:flex;align-items:center;gap:24px;font-size:var(--font-small,.9375rem)}.level-navigation>a{white-space:nowrap}.more-menu{position:relative}.more-menu>summary{cursor:pointer;color:#526456;list-style:none;padding:5px 0}.more-menu>summary::-webkit-details-marker{display:none}.more-menu>summary::after{content:"⌄";display:inline-block;margin-left:7px;font-size:var(--font-body,1rem)}.more-menu[open]>summary::after{transform:rotate(180deg)}.more-links{position:absolute;right:0;top:calc(100% + 12px);z-index:10;width:245px;max-height:min(74vh,570px);overflow-y:auto;background:#fff;border:1px solid var(--level-line);border-radius:12px;padding:10px;box-shadow:0 8px 28px #294b341c}.more-links a{display:block;padding:9px 11px;border-radius:6px;font-size:var(--font-body,1rem);color:#3c6146}.more-links a:hover{background:#f0f6ec}.more-links>span{display:block;border-top:1px solid #edf1e9;margin:7px 0 3px;padding:11px 11px 2px;font-size:var(--font-small,.9375rem);color:#526456}.level-shell{max-width:820px;margin:0 auto;padding:38px 28px 70px}h1{font-size:var(--font-page,1.625rem);line-height:1.4;font-weight:600;letter-spacing:normal;margin:0 0 25px}.difficulty-tabs{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:10px;margin-bottom:24px}.difficulty-tabs button{background:#fff;border:1px solid var(--level-line);border-radius:9px;padding:11px 4px;color:#526456;font-size:var(--font-body,1rem);min-height:46px}.difficulty-tabs button:hover{border-color:#8daf84}.difficulty-tabs button[aria-pressed=true]{background:var(--level-green);color:white;border-color:var(--level-green);font-weight:600}.level-toolbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:17px}#library-completed{font-size:var(--font-small,.9375rem);color:var(--level-muted);margin:0;white-space:nowrap}.status-tabs{display:flex;gap:5px}.status-tabs button{background:transparent;border:0;padding:5px 9px;border-radius:6px;font-size:var(--font-body,1rem);line-height:1.6;color:#526456}.status-tabs button[aria-pressed=true]{background:#e7efdf;color:#46743b}.level-list{display:grid;grid-template-columns:repeat(10,minmax(0,1fr));gap:11px}.level-list>div{min-width:0}.level-number{position:relative;display:grid;place-items:center;aspect-ratio:1;background:#fff;border:1px solid #dce6d7;border-radius:10px;color:#47683c;font-size:20px;font-variant-numeric:tabular-nums;min-height:44px;transition:background .12s,border-color .12s}.level-number:hover{background:#edf5e6;border-color:#8fb67d}.level-number.started{border-color:#9cb786;background:#f3f7ed}.level-number.completed{background:#e1edd7;border-color:#c8ddba;color:#668c52}.level-number small{position:absolute;right:6px;top:3px;font-size:var(--font-small,.9375rem);line-height:1;color:#679450}.level-number.started small{font-size:22px;top:0;right:5px}.library-empty{grid-column:1/-1;margin:8px 0;padding:28px 10px;text-align:center;color:var(--level-muted);font-size:var(--font-small,.9375rem)}@media(max-width:650px){.topbar{min-height:62px;padding:13px 18px;gap:12px}.brand{font-size:18px}.level-navigation{gap:17px;font-size:var(--font-small,.9375rem)}.level-shell{padding:27px 18px 80px}h1{font-size:var(--font-page,1.625rem);margin-bottom:22px;font-weight:600}.difficulty-tabs{gap:7px;margin-bottom:22px}.difficulty-tabs button{font-size:var(--font-body,1rem);padding:10px 3px}.level-list{grid-template-columns:repeat(6,minmax(0,1fr));gap:10px}.level-number{font-size:21px}.level-toolbar{gap:8px}#library-completed{font-size:var(--font-small,.9375rem)}.status-tabs{gap:1px}.status-tabs button{padding:5px 7px;font-size:var(--font-body,1rem)}}@media(max-width:360px){.topbar{padding-inline:13px}.brand{font-size:16px}.level-navigation{gap:13px;font-size:var(--font-small,.9375rem)}.level-shell{padding-inline:13px}.difficulty-tabs{gap:5px}.difficulty-tabs button{font-size:var(--font-body,1rem)}.level-list{gap:7px}.level-number{font-size:19px;min-height:40px;border-radius:8px}.status-tabs button{padding-inline:5px}.more-links{width:230px}}@media(prefers-reduced-motion:reduce){.level-number{transition:none}}