:root{font-family:Inter,PingFang SC,Microsoft YaHei,system-ui,sans-serif;color:#2f3442;background:#f3f1fa;font-synthesis:none;--bg: #f3f1fa;--surface: rgba(255, 255, 255, .86);--ink: #2f3442;--muted: #777d8d;--accent: #db6878;--accent-dark: #b64758;--line: rgba(88, 94, 112, .16);--shadow: 0 18px 50px rgba(58, 51, 88, .12)}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100dvh;background:radial-gradient(circle at 50% 0%,#fff 0,var(--bg) 46%)}button,input{font:inherit}button{touch-action:manipulation}#root{min-height:100dvh}.app-shell{width:min(100%,540px);min-height:100dvh;margin:0 auto;padding:max(18px,env(safe-area-inset-top)) 18px max(18px,env(safe-area-inset-bottom))}.home-page{display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center}.home-mark{width:156px;height:156px;border-radius:42px;background:linear-gradient(145deg,#fff,#f4f0ff);box-shadow:0 22px 52px #41346f2e;display:grid;place-items:center;margin-bottom:24px}.home-mark img{width:142px;height:142px;object-fit:contain}.eyebrow{margin:0 0 4px;color:var(--accent-dark);font-size:12px;font-weight:800;letter-spacing:.16em;text-transform:uppercase}h1{margin:0;font-size:clamp(30px,9vw,46px);letter-spacing:-.04em}.home-copy{max-width:330px;color:var(--muted);line-height:1.7;margin:14px 0 28px}.home-actions{width:min(100%,340px);display:grid;gap:12px}.primary-button,.secondary-button,.text-button{border:0;border-radius:16px;min-height:52px;font-weight:750;cursor:pointer}.primary-button{color:#fff;background:linear-gradient(135deg,var(--accent),#ef8a78);box-shadow:0 12px 28px #db687847}.secondary-button{background:#fff;color:var(--ink);border:1px solid var(--line)}.text-button{background:transparent;color:var(--muted)}.privacy-note{margin-top:26px;font-size:12px;color:var(--muted)}.page-header,.game-header{display:grid;grid-template-columns:72px 1fr 72px;align-items:center;min-height:44px;text-align:center}.page-header h1{font-size:20px}.header-button{border:0;background:transparent;color:var(--muted);min-height:42px;cursor:pointer}.header-spacer{width:72px}.level-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:28px}.level-card{border:1px solid var(--line);border-radius:18px;background:var(--surface);min-height:116px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;color:var(--ink);box-shadow:0 8px 20px #3a33580f}.level-number{font-size:26px;font-weight:850}.level-card small{color:var(--muted)}.game-page{width:min(100%,600px)}.game-header{font-size:14px;font-weight:750}.rules-card{display:grid;grid-template-columns:repeat(3,1fr);color:#fff;background:linear-gradient(105deg,#3977dc,#755cc7);border:0;border-radius:17px;overflow:hidden;margin:10px 0 14px;box-shadow:0 12px 28px #4256ae38}.rules-card span{min-height:52px;display:grid;place-items:center;padding:7px;text-align:center;font-size:11px;line-height:1.35;font-weight:720}.rules-card span+span{border-left:1px solid rgba(255,255,255,.22)}.game-title{display:flex;align-items:end;justify-content:space-between;padding:4px 4px 12px}.game-title h1{font-size:30px}.progress-cluster{display:flex;align-items:center;gap:6px}.infinite-pill,.progress-pill{background:#fff;border:1px solid var(--line);border-radius:999px;padding:8px 10px;font-size:11px;color:var(--muted);white-space:nowrap}.infinite-pill{color:#5b4fb0;background:#f3f0ff;border-color:#d9d1fa;font-weight:800}.progress-pill strong{color:var(--accent-dark)}.board-shell{position:relative;width:100%;aspect-ratio:1;border-radius:12px;overflow:hidden;isolation:isolate}.board-canvas{position:absolute;inset:0;width:100%;height:100%;z-index:0}.board-hit-grid{position:absolute;inset:0;z-index:1;display:grid;grid-template-columns:repeat(var(--board-size),1fr);gap:clamp(3px,.8vw,5px);touch-action:none}.board-hit-cell{min-width:0;min-height:36px;border:0;border-radius:8px;background:transparent;cursor:pointer}.board-hit-cell:focus-visible{outline:3px solid #2e5ff0;outline-offset:-4px}.board-status{display:flex;justify-content:space-between;padding:10px 4px 4px;color:var(--muted);font-size:12px}.game-message{margin:8px 0 0;padding:10px 12px;border-radius:12px;background:#fff;color:var(--muted);font-size:13px}.tool-bar{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:12px}.tool-bar button{min-height:44px;border:1px solid var(--line);border-radius:12px;background:#ffffffe0;color:var(--muted);font-size:12px;font-weight:700}.tool-bar button.selected{background:var(--ink);color:#fff}.tool-bar button:disabled{opacity:.38}.tool-bar .hint-button{background:var(--accent);color:#fff;border-color:var(--accent)}.settings-list{margin-top:24px;overflow:hidden;border:1px solid var(--line);border-radius:18px;background:var(--surface)}.settings-list label{min-height:58px;padding:0 18px;display:flex;align-items:center;justify-content:space-between}.settings-list label+label{border-top:1px solid var(--line)}.settings-list input{width:22px;height:22px;accent-color:var(--accent)}.choice-section{margin-top:28px}.choice-section h2{font-size:16px;margin:0 0 12px}.choice-row{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.choice-row button{min-height:54px;border:1px solid var(--line);border-radius:15px;background:#fff;color:var(--muted);font-weight:750}.choice-row button.selected{background:var(--ink);color:#fff}.generate-button{width:100%;margin-top:34px}.generation-status{min-height:24px;color:var(--muted);text-align:center;font-size:13px}.hint-overlay{position:fixed;inset:0;z-index:20;display:flex;align-items:end;justify-content:center;padding:18px;background:#282a3847;-webkit-backdrop-filter:blur(5px);backdrop-filter:blur(5px)}.hint-sheet{width:min(100%,480px);max-height:min(82dvh,680px);overflow:auto;padding:22px;border-radius:24px;background:#fff;box-shadow:var(--shadow)}.hint-sheet h2{margin:6px 0 12px;font-size:19px;line-height:1.5}.hint-sheet p:not(.eyebrow){color:var(--muted);line-height:1.55}.hint-proof{display:grid;gap:8px;margin:14px 0}.hint-proof section{padding:11px 13px;border-radius:14px;background:#f5f3fb}.hint-proof strong{color:#55499b;font-size:12px}.hint-proof p{margin:5px 0 0;font-size:13px}.hint-proof .hint-conclusion{background:#eef4ff}.hint-sheet button{width:100%;margin-top:9px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}.completion-overlay{position:fixed;inset:0;z-index:30;display:grid;place-items:center;padding:20px;background:#282a3852;-webkit-backdrop-filter:blur(7px);backdrop-filter:blur(7px)}.completion-card{width:min(100%,390px);padding:26px;border-radius:28px;background:#fff;text-align:center;box-shadow:var(--shadow)}.completion-card>img{width:88px;height:88px;object-fit:contain}.completion-card h2{margin:6px 0 18px;font-size:22px}.completion-card>button{width:100%;margin-top:9px}.completion-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-bottom:16px}.completion-stats span{padding:10px 5px;border-radius:12px;background:var(--bg);color:var(--muted);font-size:11px}.completion-stats strong{display:block;margin-top:3px;color:var(--ink)}@media(max-height:760px){.rules-card span{min-height:44px}.game-title{padding-bottom:8px}.tool-bar{margin-top:8px}.tool-bar button{min-height:40px}}@media(min-width:760px)and (orientation:landscape){.game-page{width:min(100%,980px);display:grid;grid-template-columns:minmax(420px,600px) 260px;column-gap:28px;align-content:center}.game-header,.rules-card,.game-title{grid-column:1 / -1}.board-shell{grid-column:1;grid-row:4 / span 4}.board-status,.game-message,.tool-bar{grid-column:2}.tool-bar{grid-template-columns:repeat(2,1fr);align-self:start}}