:root{color-scheme:dark;--bg:#090e19;--panel:#111827;--line:#263142;--text:#eaf0f6;--muted:#8f9bb0;--lime:#b6ff81;--pink:#ff6aad}*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 65% 5%,#18243b66,transparent 50%),var(--bg);color:var(--text);font:16px/1.6 Inter,"Segoe UI","Microsoft YaHei",sans-serif}button,a,input{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;border:1px solid var(--line);background:#151e2c;border-radius:9px;padding:9px 14px;cursor:pointer;transition:background .2s,transform .2s}button:hover{background:#243246}button:active{transform:translateY(1px)}button:focus-visible,a:focus-visible{outline:2px solid var(--lime);outline-offset:4px}button:disabled{cursor:not-allowed;opacity:.45}button[hidden]{display:none}header{height:90px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;padding:0 5%;gap:20px}.brand{font-size:21px;letter-spacing:1px;font-weight:850;color:var(--text);text-decoration:none;display:flex;align-items:center;gap:5px}.brand>span:not(.logo){color:var(--lime)}.logo{display:inline-grid;place-items:center;background:var(--lime);color:#132020;width:34px;height:34px;border-radius:9px;margin-right:8px}.brand small{font-size:12px;letter-spacing:0;font-weight:400;color:var(--muted);margin-left:18px}.header-actions{display:flex;align-items:center;gap:12px;font-size:14px}.status{color:var(--muted);margin-right:8px}i{display:inline-block;width:6px;height:6px;background:var(--lime);border-radius:50%;margin-right:7px}main{max-width:1500px;margin:auto;padding:32px 5%}.heading{display:flex;align-items:center;justify-content:space-between;margin-bottom:28px}.eyebrow{font-size:12px;letter-spacing:2px;color:var(--muted);font-weight:600;margin:0 0 8px}h1{font-size:clamp(30px,3.5vw,52px);letter-spacing:-2px;line-height:1.2;margin:0;font-weight:900}h1 em{font-style:normal;color:var(--lime)}h1 span{font-size:15px;letter-spacing:2px;font-weight:400;margin-left:20px;color:var(--muted)}.edition{font-size:12px;text-align:right;color:var(--muted);letter-spacing:1px}.workspace{display:grid;grid-template-columns:220px minmax(300px,1fr) 220px;gap:24px;align-items:start}.section-label{font-size:13px;color:var(--muted);margin:0 0 16px;display:flex;justify-content:space-between}.section-label span{font-size:12px}.mode{display:flex;align-items:center;text-align:left;gap:12px;width:100%;padding:16px 12px;margin-bottom:10px;background:transparent}.mode>span{font-size:26px}.mode div{font-size:15px;font-weight:650;flex:1}.mode small{display:block;font-size:12px;font-weight:400;color:var(--muted);margin-top:3px}.mode b{font-weight:400}.mode.active{background:#b6ff810d;border-color:#b6ff8166;color:var(--lime)}.chapter-card{margin:24px 0 16px;background:linear-gradient(150deg,#192638,#111725);border:1px solid var(--line);padding:20px;border-radius:12px;overflow:hidden}.chapter-card h2{margin:0;font-size:23px}.orbit{height:130px;position:relative;display:grid;place-items:center;font-size:94px;color:#95cfff;text-shadow:0 0 40px #498fff80;transform:rotate(-12deg)}.orbit span{position:absolute;font-size:32px;color:var(--lime);transform:rotate(12deg)}.chapter-card p:not(.eyebrow){font-size:14px;color:var(--muted)}.chapter-progress{height:4px;background:#2a3646;border-radius:10px;margin:16px 0 8px}.chapter-progress span{height:100%;display:block;background:var(--lime)}.chapter-card small{font-size:12px;color:var(--muted)}.wide{width:100%;display:flex;justify-content:space-between}.secondary{background:transparent}.game-panel{border:1px solid #344253;border-radius:15px;background:#0d1521;overflow:hidden;box-shadow:0 20px 60px #0004}.game-top,.game-bottom{display:flex;align-items:center;justify-content:space-between;padding:13px 20px;gap:10px;font-size:13px}.game-top{border-bottom:1px solid var(--line)}.game-top b{letter-spacing:1px}.game-top>span:nth-child(2){color:var(--muted)}.game-top button,.game-bottom button{font-size:12px;padding:5px 9px;background:transparent}.board-wrap{position:relative;margin:14px;aspect-ratio:1;background:#0a111b;border:1px solid #243242;border-radius:6px;overflow:hidden;touch-action:none}canvas{display:block;width:100%;height:100%}.overlay{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:22px;background:#0a111bce;backdrop-filter:blur(4px)}.overlay[hidden]{display:none}.overlay-icon{border:1px solid #b6ff8155;color:var(--lime);background:#b6ff8110;width:66px;height:66px;border-radius:18px;font-size:44px;line-height:60px;margin-bottom:22px;box-shadow:0 0 50px #b6ff8115}.overlay h2{font-size:clamp(27px,3vw,42px);margin:0;letter-spacing:2px}.overlay p:not(.eyebrow){font-size:14px;color:#a7b6ca;max-width:300px;margin:12px 0 24px}.overlay button{min-width:190px;margin-bottom:10px}.overlay #primary{background:var(--lime);color:#162115;border:0;font-weight:750;padding:13px 24px;display:flex;justify-content:space-between;gap:20px;box-shadow:0 5px 26px #b6ff8120}.overlay small{color:var(--muted);font-size:12px;margin-top:12px}.game-bottom{padding-top:0;color:var(--muted)}.game-bottom b{color:#dfe9f5;font-weight:500}.food-dot{background:var(--pink);width:8px;height:8px}.score-card{background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:22px}.score-card strong{font-size:48px;line-height:1.2;display:block;font-weight:750;letter-spacing:2px;font-variant-numeric:tabular-nums}.score-caption{display:block;color:var(--muted);font-size:12px;margin-top:10px}hr{border:0;border-top:1px solid var(--line);margin:22px 0 14px}.record{display:flex;justify-content:space-between;font-size:13px;color:var(--muted)}.record b{color:var(--lime)}.stats{display:grid;grid-template-columns:1fr 1fr;margin:16px 0;border:1px solid var(--line);border-radius:12px;padding:16px 12px;gap:8px}.stats span{display:block;font-size:12px;color:var(--muted)}.stats b{font-size:23px}.stats small{font-size:12px;font-weight:400;color:var(--muted)}.guide{padding:16px 4px;color:var(--muted);font-size:13px}.keys{text-align:center;line-height:36px}.keys kbd{display:inline-block;font:16px monospace;width:31px;height:30px;border:1px solid #3a4659;border-bottom:3px solid #3a4659;border-radius:5px;margin:2px;background:#172031;color:#e0e6ef}.guide>p:not(.section-label){text-align:center}.hint{border-top:1px solid var(--line);padding-top:18px;font-size:12px}.save-actions{display:flex;gap:8px}.save-actions button{font-size:12px;padding:8px;flex:1}footer{border-top:1px solid var(--line);margin-top:36px;padding:22px 0;display:flex;justify-content:space-between;align-items:center;gap:16px;color:var(--muted);font-size:12px}footer b{font-size:15px;color:var(--text);margin-right:14px}footer div span{display:inline-block}.touch-controls{display:none;text-align:center;padding:0 10px 15px;touch-action:none}.touch-controls button{width:54px;height:43px;margin:3px;font-size:22px}dialog{color:var(--text);background:#101927;border:1px solid #3a495d;border-radius:18px;padding:28px;width:min(690px,92vw);max-height:85vh}dialog::backdrop{background:#000a;backdrop-filter:blur(5px)}.dialog-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.dialog-head h2{margin:0}.dialog-head button{background:transparent}.tabs{display:flex;gap:6px;overflow-x:auto;margin-bottom:20px}.tabs button{white-space:nowrap;font-size:13px}.tabs .selected{background:var(--lime);color:#12200f}.level-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}.level-grid button{padding:15px 5px;font-size:20px}.level-grid small{display:block;font-size:12px;color:var(--lime)}.muted{color:var(--muted);font-size:12px}#toast{position:fixed;bottom:20px;left:50%;transform:translateX(-50%);background:#263a2d;border:1px solid #b6ff8160;border-radius:10px;padding:12px 20px;z-index:10;max-width:90%;display:none}#toast.show{display:block}@media(min-width:1500px){.workspace{grid-template-columns:240px minmax(300px,1fr) 240px}}@media(max-width:1100px){.workspace{grid-template-columns:180px minmax(300px,1fr)}.right-panel{grid-column:1/-1;display:grid;grid-template-columns:1fr 1fr 1fr;gap:16px}.right-panel .guide{display:none}.stats{margin:0}.save-actions{align-items:center}.brand small{display:none}}@media(max-width:700px){header{height:68px;padding:0 5%;gap:8px}.brand{font-size:16px}.logo{width:28px;height:28px}.status,.header-actions #help,.edition{display:none}.header-actions button{font-size:12px}main{padding:24px 4%}.heading{margin-bottom:22px}h1{font-size:32px}h1 span{display:block;font-size:12px;margin:8px 0 0;letter-spacing:3px}.workspace{grid-template-columns:1fr;gap:16px}.left-panel{display:grid;grid-template-columns:1fr 1fr;gap:8px}.left-panel .section-label,.chapter-card{display:none}.mode{margin:0;padding:10px}.mode small{font-size:11px}.left-panel .wide{grid-column:1/-1;padding:7px 12px;font-size:13px}.game-panel{grid-row:2}.game-top,.game-bottom{padding-left:12px;padding-right:12px}.board-wrap{margin:8px}.overlay-icon{width:48px;height:48px;line-height:43px;font-size:32px;margin-bottom:12px}.overlay p:not(.eyebrow){margin:8px 0 15px}.overlay small{margin-top:2px;font-size:11px}.right-panel{grid-template-columns:1fr 1fr;gap:12px}.score-card{padding:14px}.score-card .section-label{margin-bottom:6px}.score-card strong{font-size:32px}.score-caption{display:none}.score-card hr{margin:8px 0}.stats{padding:14px 10px;align-items:center}.save-actions{grid-column:1/-1}.touch-controls{display:block}footer{align-items:start;margin-top:22px}footer div span{display:block}footer>span{max-width:130px;text-align:right}.level-grid{gap:7px}dialog{padding:20px}.tabs button{padding:7px}.overlay h2{font-size:28px}}@media(pointer:coarse){.touch-controls{display:block}}@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}
@media(max-width:700px){.header-actions #help{display:inline-block;font-size:0;width:32px;padding:6px}.header-actions #help::after{content:"?";font-size:14px}.header-actions{gap:6px}}