:root{--canvas:#2b2622;--soft:#383330;--line:#4b443e;--ink:#f7f5f0;--muted:#b8afa3;--paper:#f2eee6;--red:#df493f;--green:#4b9a68;--purple:#8466bc;--accent:#d7ff64;--shadow:0 18px 50px #17120f55;font-family:Inter,"PingFang SC","Microsoft YaHei",system-ui,sans-serif;color:var(--ink);background:var(--canvas);font-synthesis:none}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;background:var(--canvas)}button{font:inherit}button,a{-webkit-tap-highlight-color:transparent}.screen{display:none;min-height:100vh}.screen.active{display:block}.brandbar{height:76px;padding:0 clamp(20px,4vw,60px);display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.wordmark{color:var(--ink);text-decoration:none;font-weight:750;letter-spacing:-.08em;font-size:25px}.wordmark span{color:var(--accent);font-size:13px;vertical-align:top;margin-left:3px}.icon-btn{width:40px;height:40px;border:1px solid var(--line);border-radius:50%;display:grid;place-items:center;background:transparent;color:var(--ink);cursor:pointer}.icon-btn:hover{background:var(--soft)}.icon-btn svg{width:20px;fill:none;stroke:currentColor;stroke-width:1.5}.hero{padding:clamp(60px,9vw,128px) clamp(20px,8vw,120px) clamp(52px,7vw,92px);border-bottom:1px solid var(--line)}.eyebrow{font:12px/1.2 ui-monospace,SFMono-Regular,monospace;letter-spacing:.16em;color:var(--accent);text-transform:uppercase;margin:0 0 24px}.hero h1,.info-wrap>h1{font-size:clamp(54px,9.6vw,138px);line-height:.84;letter-spacing:-.075em;font-weight:470;margin:0;max-width:1100px}.hero h1 em,.info-wrap h1 em{font-family:Georgia,"Songti SC",serif;font-weight:400;color:var(--muted)}.lede{max-width:520px;margin:38px 0 0 auto;color:var(--muted);font-size:clamp(16px,1.8vw,21px);line-height:1.65}.mode-list{display:grid;grid-template-columns:1fr 1fr}.mode-card{padding:clamp(28px,5vw,72px);min-height:390px;border-right:1px solid var(--line);border-bottom:1px solid var(--line);display:flex;flex-direction:column}.mode-card>div:first-child{display:flex;justify-content:space-between}.index{font:12px ui-monospace,monospace;color:var(--muted)}.tag{font-size:12px;color:var(--muted);border:1px solid var(--line);border-radius:99px;padding:5px 10px}.mode-card h2{font-size:clamp(30px,4vw,56px);font-weight:450;letter-spacing:-.05em;margin:62px 0 14px}.mode-card p{color:var(--muted);line-height:1.7;max-width:520px;margin:0}.mode-actions{display:flex;gap:18px;align-items:center;margin-top:auto;padding-top:40px}.primary,.secondary,.text-btn,.controls button{border:0;cursor:pointer}.primary{background:var(--ink);color:var(--canvas);border-radius:3px;padding:13px 18px;font-weight:650}.primary:hover{background:var(--accent)}.primary span{margin-left:24px}.text-btn{background:none;color:var(--ink);padding:10px 0;border-bottom:1px solid var(--muted)}.home-footer{min-height:90px;display:flex;align-items:center;gap:30px;padding:20px clamp(20px,4vw,60px);color:var(--muted);font-size:13px}.home-footer span{margin-left:auto}
.game-screen{height:100vh;overflow:hidden}.game-header{height:78px;border-bottom:1px solid var(--line);display:grid;grid-template-columns:60px 1fr auto auto;gap:30px;align-items:center;padding:0 clamp(18px,3vw,44px)}.game-header .back{width:38px;height:38px}.game-name{display:flex;align-items:baseline;gap:10px}.game-name span{font:10px ui-monospace,monospace;letter-spacing:.15em;color:var(--accent)}.game-name strong{font-size:20px;letter-spacing:-.03em}.stat{border-left:1px solid var(--line);padding-left:28px;min-width:76px}.stat small{color:var(--muted);font-size:10px;display:block;margin-bottom:3px}.stat strong{font:18px ui-monospace,monospace}.game-stage{height:calc(100vh - 78px);display:flex;flex-direction:column;max-width:1050px;margin:auto;padding:20px clamp(16px,3vw,36px) 18px}.status-row{height:34px;display:flex;align-items:flex-start;justify-content:space-between}.status-row p{margin:0;color:var(--muted);font-size:13px}.badge{display:none;font:10px ui-monospace,monospace;color:#ffab91;border:1px solid #8a5044;padding:4px 8px;border-radius:99px}.badge.on{display:block}.board{flex:1;min-height:0;display:grid;grid-template-columns:repeat(3,1fr);grid-template-rows:repeat(4,minmax(0,1fr));gap:clamp(7px,1.1vh,12px);padding-bottom:16px}.board.planet{grid-template-rows:repeat(3,minmax(0,1fr));max-width:790px;width:100%;margin:auto}.set-card{position:relative;border:1px solid #cfc8bc;border-radius:6px;background:var(--paper);box-shadow:0 1px 0 #fff inset,var(--shadow);cursor:pointer;display:grid;place-items:center;padding:3px;transition:transform .16s,border-color .16s,box-shadow .16s;overflow:hidden}.set-card:hover{transform:translateY(-2px);border-color:#fff}.set-card.selected{border:3px solid var(--accent);box-shadow:0 0 0 2px #2b2622,0 0 0 4px var(--accent),var(--shadow);transform:translateY(-2px)}.set-card.hinted{border:3px solid #6de5ca;box-shadow:0 0 0 2px var(--canvas),0 0 0 4px #6de5ca}.set-card svg{width:100%;height:100%;display:block}.keycap{position:absolute;left:8px;top:6px;color:#766f66;font:9px ui-monospace,monospace}.controls{height:44px;display:grid;grid-template-columns:1fr 1fr;gap:8px}.controls button{border:1px solid var(--line);border-radius:3px;color:var(--ink);background:var(--soft);padding:0 14px;display:flex;justify-content:space-between;align-items:center;font-size:13px}.controls button:hover{border-color:var(--muted)}.controls .comet-btn{display:none;background:var(--ink);color:var(--canvas)}.controls.planet-controls{grid-template-columns:1fr 1fr 1.25fr}.controls.planet-controls .comet-btn{display:flex}kbd{font:10px ui-monospace,monospace;border:1px solid currentColor;border-radius:3px;padding:2px 5px;opacity:.65}
.info-wrap{max-width:1200px;margin:auto;padding:70px 30px 100px}.info-wrap>h1{font-size:clamp(58px,10vw,120px);margin-bottom:90px}.rule-grid{display:grid;grid-template-columns:1fr 1fr;border-top:1px solid var(--line);border-left:1px solid var(--line)}.rule-grid article{min-height:330px;padding:34px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.rule-grid article>span{font:11px ui-monospace,monospace;color:var(--accent)}.rule-grid h2{font-size:28px;font-weight:500;margin:50px 0 12px}.rule-grid p{color:var(--muted);line-height:1.8}.mini-cards{height:90px;display:flex;gap:8px;margin-top:24px}.mini-cards .set-card{width:30%;pointer-events:none}.shortcut-note{display:flex;gap:50px;padding:38px 0;color:var(--muted);line-height:2}.shortcut-note>span{color:var(--accent);font:11px ui-monospace,monospace}.shortcut-note p{margin:0}.wide{width:100%;padding:17px}.practice-wrap{max-width:640px;margin:auto;padding:50px 24px}.practice-wrap>p{text-align:center;color:var(--muted)}.practice-board{display:grid;grid-template-columns:1fr 1fr;gap:12px;height:min(62vh,560px);margin:28px 0}.answer-row{display:grid;grid-template-columns:1fr 1fr;gap:10px}.answer-row button{padding:15px;border-radius:3px}.secondary{color:var(--ink);background:var(--soft);border:1px solid var(--line)}
@media(max-width:700px){.mode-list{grid-template-columns:1fr}.mode-card{min-height:360px}.hero h1{font-size:17vw}.lede{margin-left:0}.home-footer{flex-wrap:wrap}.home-footer span{width:100%;margin-left:0}.game-header{grid-template-columns:42px 1fr auto;gap:10px;padding:0 14px}.game-header .stat:first-of-type{display:none}.stat{padding-left:12px}.game-name{display:block}.game-name span{display:block}.game-stage{padding:14px 10px 10px}.board{gap:7px;padding-bottom:10px}.controls{height:48px}.controls button{padding:0 10px}.controls.planet-controls{grid-template-columns:1fr 1fr 1.2fr}.controls kbd{display:none}.rule-grid{grid-template-columns:1fr}.rule-grid article{min-height:260px}.info-wrap{padding:55px 20px}.info-wrap>h1{margin-bottom:55px}.shortcut-note{display:block}.shortcut-note>span{display:block;margin-bottom:14px}}
@media(max-height:700px) and (min-width:701px){.game-stage{padding-top:10px}.status-row{height:26px}.controls{height:38px}.board{padding-bottom:8px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}

/* Refined shell, confirmations and records */
.color-toggle{height:38px;display:flex;align-items:center;gap:9px;padding:0 6px 0 12px;background:transparent;color:var(--ink);border:1px solid var(--line);border-radius:99px;cursor:pointer;font-size:12px}.color-toggle:hover{background:var(--soft)}.color-toggle svg{width:17px;fill:none;stroke:currentColor;stroke-width:1.5}.color-toggle i{font-style:normal;color:var(--canvas);background:var(--muted);border-radius:99px;padding:3px 7px}.color-toggle.on i{background:var(--accent)}
.home-screen .hero{padding:clamp(32px,5vh,58px) clamp(20px,8vw,120px) clamp(28px,4vh,46px)}.home-screen .hero h1{font-size:clamp(48px,7.2vw,102px)}.home-screen .lede{margin-top:18px}.home-screen .mode-card{padding:clamp(20px,3vw,42px);min-height:270px}.home-screen .mode-card h2{font-size:clamp(28px,3.1vw,45px);margin:28px 0 10px}.home-screen .mode-actions{padding-top:18px;flex-wrap:wrap}.home-screen .home-footer{min-height:62px}.home-footer b{display:inline-grid;place-items:center;min-width:18px;height:18px;margin-left:4px;background:var(--soft);border-radius:50%;font-size:10px}
.controls{grid-template-columns:1fr 1fr 1fr}.controls.planet-controls{grid-template-columns:1fr 1fr 1.15fr 1fr}.controls button:disabled{color:var(--muted);cursor:not-allowed}.end-btn{background:transparent!important}.rule-grid article[hidden]{display:none}
.confirm-bar{position:fixed;z-index:20;left:50%;bottom:24px;transform:translate(-50%,140%);width:min(620px,calc(100% - 28px));background:var(--ink);color:var(--canvas);padding:14px 16px;border-radius:5px;display:flex;align-items:center;justify-content:space-between;gap:18px;box-shadow:0 18px 60px #0008;transition:transform .2s}.confirm-bar.on{transform:translate(-50%,0)}.confirm-bar>span{font-size:13px}.confirm-bar>div{display:flex;gap:7px}.confirm-bar button{padding:8px 12px;border-radius:3px;cursor:pointer}.danger{border:0;background:#b83d34;color:white}
.modal{position:fixed;z-index:30;inset:0;background:#17130fd9;display:none;place-items:center;padding:18px;backdrop-filter:blur(7px)}.modal.on{display:grid}.modal-card{position:relative;width:min(560px,100%);max-height:90vh;overflow:auto;background:var(--canvas);border:1px solid var(--line);border-radius:6px;padding:clamp(28px,5vw,54px);box-shadow:0 30px 90px #0008}.modal-close{position:absolute;right:16px;top:14px;border:0;background:none;color:var(--muted);font-size:27px;cursor:pointer}.modal-card h2{font-size:clamp(34px,7vw,58px);letter-spacing:-.055em;font-weight:450;margin:0 0 35px}.result-score{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:26px 0}.result-score strong{font:clamp(52px,12vw,88px)/1 ui-monospace,monospace;letter-spacing:-.06em}.result-score span{display:block;color:var(--muted);font-size:12px;margin-top:8px}.result-meta{display:flex;justify-content:space-between;color:var(--muted);font-size:13px;padding:18px 0 32px}.modal-actions{display:flex;gap:10px;align-items:center;flex-wrap:wrap}.storage-note{color:var(--muted);margin-top:-26px}.history-list{margin:28px 0;display:grid;gap:1px;background:var(--line)}.history-item{display:grid;grid-template-columns:1fr auto;gap:5px 15px;background:var(--soft);padding:14px}.history-item strong{font:20px ui-monospace,monospace}.history-item small{color:var(--muted)}.empty-history{background:var(--canvas);color:var(--muted);padding:40px 0;text-align:center}.danger-text{color:#ff9b83}
@media(min-width:701px) and (min-height:700px){.home-screen{height:100vh;overflow:hidden}.home-screen .brandbar{height:64px}.home-screen .hero{height:calc((100vh - 126px)*.48)}.home-screen .mode-list{height:calc((100vh - 126px)*.52)}.home-screen .mode-card{min-height:0}.home-screen .hero h1{font-size:min(8.3vh,7.2vw)}.home-screen .mode-card h2{font-size:min(4.3vh,3.1vw)}}
@media(max-width:700px){.home-screen .mode-card{min-height:330px}.color-toggle span{display:none}.controls{height:auto;grid-template-columns:1fr 1fr;grid-auto-rows:42px}.controls.planet-controls{grid-template-columns:1fr 1fr}.game-stage{padding-bottom:max(10px,env(safe-area-inset-bottom))}.confirm-bar{bottom:max(14px,env(safe-area-inset-bottom))}.modal-actions>*{flex:1}.result-card{padding-top:48px}.result-meta{align-items:flex-start;gap:8px}.game-header{height:70px}.game-stage{height:calc(100vh - 70px)}}
.confirm-bar{z-index:40}
.footer-links{margin-left:auto;display:flex;align-items:center;gap:10px;white-space:nowrap}.footer-links a{color:var(--muted);text-decoration:none}.footer-links a:hover{color:var(--ink)}.footer-links i{font-style:normal;color:var(--line)}.home-footer .footer-links span{margin-left:0;width:auto}
.rule-example{min-height:470px!important}.example-cards{display:grid;gap:6px;margin-top:22px}.example-cards .set-card{min-height:68px;pointer-events:none}.planet-example{grid-template-columns:repeat(5,1fr)}.planet-example .set-card:last-child{outline:2px solid #6de5ca;outline-offset:2px}.example-card-wrap{position:relative}.example-card-wrap .set-card{width:100%;height:100%}.example-label{position:absolute;z-index:2;left:6px;top:4px;font:9px ui-monospace,monospace;color:#766f66}.comet-example{grid-template-columns:repeat(3,1fr)}.refresh-example{margin-top:14px}.practice-best{display:flex;justify-content:space-between;align-items:baseline;border:1px solid var(--line);border-radius:4px;padding:13px 16px;color:var(--muted);font-size:12px}.practice-best strong{color:var(--accent);font:14px ui-monospace,monospace}.answer-row button:disabled{opacity:.4;cursor:not-allowed}.practice-board.loading{opacity:.3}
@media(max-width:700px){.home-footer .footer-links{width:100%;margin-left:0;overflow-x:auto;padding-bottom:2px}.home-footer .footer-links span{width:auto}.planet-example{grid-template-columns:repeat(3,1fr)}.planet-example .example-card-wrap:last-child{grid-column:2}.rule-example{min-height:430px!important}.practice-wrap{padding-top:24px}.practice-board{height:min(55vh,500px);margin:16px 0}.practice-screen .game-header{grid-template-columns:42px 1fr auto auto}.practice-screen .stat{display:block!important;min-width:62px}.practice-screen .stat small{font-size:8px}.practice-screen .stat strong{font-size:14px}}
.result-details{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);margin:0 0 28px;border:1px solid var(--line)}.result-details>div{background:var(--soft);padding:14px 10px}.result-details strong{display:block;font:24px ui-monospace,monospace;color:var(--ink)}.result-details span{display:block;margin-top:5px;color:var(--muted);font-size:10px}.practice-screen{height:100vh;overflow:hidden}.practice-wrap{height:calc(100vh - 78px);max-width:640px;padding:16px 24px 14px;display:flex;flex-direction:column}.practice-wrap>p{margin:10px 0 4px;flex:0 0 auto}.practice-best{flex:0 0 auto;padding:10px 14px}.practice-board{flex:1 1 auto;min-height:0;height:auto;margin:8px 0 12px}.answer-row{flex:0 0 46px}.answer-row button{padding:10px}
@media(max-width:700px){.result-details{grid-template-columns:repeat(2,1fr)}.practice-wrap{height:calc(100vh - 70px);padding:12px 12px max(10px,env(safe-area-inset-bottom))}.practice-board{height:auto;margin:7px 0 10px;gap:8px}.practice-best{padding:8px 11px}.practice-wrap>p{margin:7px 0 2px}.answer-row{flex-basis:42px}}
.result-details.set-result{grid-template-columns:1fr}
.invalid-example{opacity:.72}.invalid-example .set-card{border-color:#df493f}
.stat,.stat strong{white-space:nowrap}.game-name{min-width:0}.game-name strong{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.history-download{grid-column:1/-1;justify-self:start;margin-top:7px;padding:5px 0;border:0;border-bottom:1px solid var(--muted);background:transparent;color:var(--ink);font-size:11px;cursor:pointer}
@media(min-width:1000px){.home-screen .lede{max-width:none;width:max-content;margin-left:32%;white-space:nowrap}}
@media(max-width:700px){.game-header{grid-template-columns:42px minmax(0,1fr) max-content}.game-header .stat{min-width:58px;max-width:68px;padding-left:9px}.game-header .stat strong{font-size:15px}.practice-screen .game-header{grid-template-columns:36px minmax(0,1fr) 58px 62px;gap:6px;padding:0 9px}.practice-screen .stat{min-width:0;max-width:none;padding-left:7px}}
@media(max-width:700px){.game-screen .remaining-stat{display:none}.game-screen .timer-stat{grid-column:3;grid-row:1}}
@media(max-width:700px){.game-screen .game-header>.stat:nth-child(3){display:none}.game-screen .game-header>.stat:nth-child(4){display:block;grid-column:3;grid-row:1;white-space:nowrap}}