:root{color-scheme:light;--paper:#f5f2ea;--ink:#222f32;--sub:#647173;--line:#d7d8d0;--accent:#ad5439;--jade:#376b67;--soft:#e6e9df;--white:#fffdfa;font-family:system-ui,-apple-system,"Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,sans-serif;font-synthesis:none}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button{font:inherit;cursor:pointer}button:focus-visible,a:focus-visible,canvas:focus-visible{outline:3px solid #ce844a;outline-offset:3px}button:disabled{opacity:.4;cursor:not-allowed}.container{width:min(100% - 40px,980px);margin-inline:auto}.site-header{border-bottom:1px solid var(--line);height:67px}.header-inner{height:100%;display:flex;align-items:center;justify-content:space-between;gap:12px}.brand{display:flex;align-items:center;gap:9px;font-weight:900;letter-spacing:.075em;font-size:15px}.brand-icon{font-size:25px;color:var(--accent);line-height:1}.site-header nav{display:flex;gap:clamp(12px,3vw,30px);font-size:12px;font-weight:700;color:#596363}.site-header nav a:hover,.site-footer a:hover{color:var(--accent)}.intro{padding:51px 0 43px}.eyebrow,.section-head>span{font:700 11px/1.4 ui-monospace,Consolas,monospace;letter-spacing:.16em;color:var(--jade)}.live-dot{display:inline-block;background:var(--accent);width:7px;height:7px;border-radius:50%;margin-right:6px}.intro h1{font-family:Arial,Helvetica,sans-serif;font-size:clamp(49px,8.5vw,88px);font-weight:900;letter-spacing:-.075em;line-height:1.05;margin:14px 0}.intro h1 span:not(.period){color:var(--jade)}.intro h1 .period{color:var(--accent)}.intro-lead{font-size:clamp(17px,2.3vw,23px);font-weight:750;line-height:1.65;letter-spacing:.06em;margin:20px 0 8px}.intro-note{color:var(--sub);font-size:12px;line-height:1.8;margin:0}.play-area{border-top:2px solid var(--ink)}.play-topline{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:15px 1px 25px}.play-topline h2{font-size:12px;letter-spacing:.08em;margin:0}.playing-label{font:700 10px/1.3 ui-monospace,monospace;letter-spacing:.12em;color:var(--jade)}.game-layout{display:flex;align-items:flex-start;justify-content:center;gap:18px}.game-left{width:min(100%,340px)}.board-frame{background:#1e2c2d;padding:12px;border:1px solid #1e2c2d;box-shadow:5px 5px 0 #d2d2c6}.board-heading{color:#d6e4dc;display:flex;justify-content:space-between;align-items:center;padding:0 3px 12px;font:700 11px/1.2 ui-monospace,Consolas,monospace;letter-spacing:.15em}.board-heading strong{font-size:12px}.board-heading #run-status{color:#95bdb2}.board-box{position:relative;width:100%;aspect-ratio:1/2;background:#18292b;overflow:hidden}#game-canvas{display:block;width:100%;height:100%;touch-action:none;user-select:none;-webkit-user-select:none}.game-overlay{position:absolute;inset:0;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;gap:0;background:rgba(18,31,32,.88);color:#f3f5ed;padding:24px}.game-overlay[hidden]{display:none}.overlay-mark{font-size:30px;line-height:.65;letter-spacing:-.12em;transform:rotate(-14deg);color:#b5cdbd;margin-bottom:35px}.game-overlay h3{font-size:clamp(21px,5vw,29px);margin:0 0 14px;letter-spacing:.05em}.game-overlay p{font-size:12px;line-height:1.8;max-width:230px;margin:0 0 30px;color:#cadad5}.game-overlay .overlay-hint{margin:14px 0 0;color:#91aaa1;font-size:10px}.primary-btn{border:0;background:#e5b06a;color:#1c2d2a;font-weight:900;border-radius:3px;padding:15px 20px;min-height:48px;font-size:14px;width:100%;max-width:215px;display:flex;align-items:center;justify-content:space-between;gap:12px}.primary-btn:hover{background:#f7c588}.touch-control{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:6px;margin-top:17px}.control-btn{min-width:0;min-height:62px;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:2px;background:#e6e9df;border:1px solid #cbd0c7;border-bottom:3px solid #a4afa7;border-radius:4px;color:var(--ink);touch-action:manipulation;user-select:none;-webkit-user-select:none}.control-btn span{font-size:24px;font-weight:700;line-height:1.1}.control-btn small{font:700 9px/1.1 ui-monospace,Consolas,monospace}.control-btn.special span{font-size:12px;font-weight:900;line-height:1.9}.control-btn.special:last-child span{font-size:27px;line-height:1}.control-btn.accent{background:#e6c1a7;border-color:#d6a689;border-bottom-color:#b6846b}.control-btn:active,.control-btn.is-pressed{transform:translateY(2px);border-bottom-width:1px}.touch-note{font-size:10px;color:var(--sub);line-height:1.6;margin:10px 0 0}.game-right{width:208px;display:flex;flex-direction:column;gap:11px}.score-card,.stat-card,.preview-card{background:var(--white);border:1px solid var(--line);padding:15px}.card-label{display:flex;justify-content:space-between;font:800 10px/1.3 ui-monospace,monospace;letter-spacing:.12em}.card-label span{font-weight:500;color:#8d9591}.number-value{display:block;font-family:Arial,Helvetica,sans-serif;font-size:40px;line-height:1.2;font-weight:900;letter-spacing:-.05em;margin:15px 0}.score-bottom{padding-top:12px;border-top:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;font:700 11px/1 ui-monospace,monospace}.score-bottom strong{font:900 18px/1.2 Arial,Helvetica,sans-serif}.stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:9px}.stat-card{padding:12px}.stat-card span{display:block;font:700 10px/1.4 ui-monospace,monospace}.stat-card strong{display:block;font:900 27px/1.5 Arial,Helvetica,sans-serif;margin-top:8px}.preview-card canvas{display:block;margin:8px auto 0;max-width:100%;height:auto}.hold-card{padding-bottom:10px}.hold-card p{font-size:10px;color:var(--sub);text-align:center;margin:0 0 4px}.secondary-btn,.ghost-btn{min-height:40px;border-radius:2px;font-size:12px;font-weight:750}.secondary-btn{display:flex;align-items:center;justify-content:space-between;background:var(--ink);border:1px solid var(--ink);color:#fff;padding:0 14px}.secondary-btn span{opacity:.7;font-family:monospace}.ghost-btn{border:1px solid var(--line);background:transparent;color:var(--ink)}.under-game{display:flex;justify-content:space-between;gap:12px;border-bottom:1px solid var(--line);padding:18px 0;margin:0;color:#8a948e;font:700 9px/1.5 ui-monospace,monospace;letter-spacing:.09em}.info-section,.about-section{padding:55px 0;border-bottom:1px solid var(--line)}.section-head h2{font-size:clamp(24px,4vw,32px);letter-spacing:.02em;line-height:1.4;margin:10px 0 20px}.info-section>p,.about-section>p{max-width:770px;font-size:14px;line-height:2.1;color:#4e5b59}.key-list{display:grid;grid-template-columns:repeat(2,1fr);gap:0 25px;margin-top:28px}.key-list>div{border-bottom:1px solid var(--line);padding:13px 0;display:flex;align-items:center;gap:7px;min-height:57px}.key-list span{margin-left:auto;font-size:12px;color:var(--sub);font-weight:650;text-align:right}.key-list kbd{background:var(--white);padding:6px 9px;border:1px solid #c8cfc5;border-bottom-width:3px;border-radius:3px;font:700 12px/1.2 ui-monospace,monospace;min-width:32px;text-align:center}.rules-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.rules-grid>div{border-top:2px solid var(--ink);padding-top:12px}.rules-grid strong{color:var(--accent);font:800 12px/1.4 ui-monospace,monospace}.rules-grid h3{font-size:16px;margin:12px 0}.rules-grid p{font-size:13px;line-height:2;color:var(--sub);margin:0}.about-section{padding-bottom:75px}.ad-section{margin-top:180px;margin-bottom:60px;text-align:center}.ad-section[hidden]{display:none}.ad-label{font-size:10px;color:#777;margin-bottom:18px}.site-footer{background:#1e2d2f;color:#eff0e9}.footer-inner{display:grid;grid-template-columns:1fr 1.4fr;gap:24px;align-items:start;padding:36px 0}.footer-inner strong{font-family:Arial,Helvetica,sans-serif;font-size:23px;letter-spacing:-.05em}.footer-inner p{font-size:11px;color:#b1bbb4}.footer-inner nav{display:flex;justify-content:flex-end;flex-wrap:wrap;gap:13px;font-size:11px}.footer-inner small{font-size:10px;color:#abb9af;grid-column:1/-1;border-top:1px solid #52605b;padding-top:20px}.legal-article{max-width:750px;margin:60px auto 85px}.legal-article h1{font-size:clamp(27px,5vw,42px)}.legal-article h2{font-size:19px;margin:34px 0 8px}.legal-article p,.legal-article li{font-size:14px;line-height:2;color:#566260}.legal-article ul{padding-left:1.4em}.legal-article .updated{font-size:12px;color:#858e89}.legal-article a{color:var(--jade);text-decoration:underline}
@media(max-width:640px){.container{width:min(100% - 26px,560px)}.site-header{height:59px}.site-header nav{font-size:10px;gap:11px}.site-header nav a:nth-child(2){display:none}.brand{font-size:12px}.intro{padding:36px 0 30px}.intro h1{font-size:clamp(49px,12.2vw,78px)}.intro-lead{font-size:17px}.game-layout{gap:9px}.game-left{width:min(100% - 104px,310px)}.game-right{width:104px;flex:0 0 104px;gap:8px}.board-frame{padding:7px;box-shadow:3px 3px 0 #d2d2c6}.board-heading{padding-bottom:7px;font-size:9px}.board-heading strong{font-size:10px}.score-card,.stat-card,.preview-card{padding:7px}.card-label{font-size:8px;letter-spacing:0}.card-label span{font-size:7px}.number-value{font-size:25px;margin:8px 0}.score-bottom{font-size:9px;padding-top:7px}.score-bottom strong{font-size:15px}.stat-grid{gap:5px}.stat-card strong{font-size:21px;margin-top:4px}.stat-card span{font-size:8px}.preview-card canvas{width:100%;margin:5px auto 0}.hold-card p{font-size:8px}.secondary-btn,.ghost-btn{min-height:39px;font-size:9px;padding:7px}.touch-control{gap:3px;margin-top:10px}.control-btn{min-height:51px;border-radius:2px}.control-btn span{font-size:20px}.control-btn small{font-size:7px}.control-btn.special span{font-size:9px}.control-btn.special:last-child span{font-size:24px}.touch-note{font-size:9px}.game-overlay{padding:10px}.overlay-mark{font-size:24px;margin-bottom:22px}.game-overlay h3{font-size:19px}.game-overlay p{font-size:10px;margin-bottom:16px}.primary-btn{font-size:11px;padding:12px 10px;min-height:41px}.overlay-hint{display:none}.info-section,.about-section{padding:38px 0}.key-list{grid-template-columns:1fr}.rules-grid{grid-template-columns:1fr;gap:24px}.under-game span{display:none}.footer-inner{grid-template-columns:1fr;gap:15px}.footer-inner nav{justify-content:flex-start}.footer-inner small{grid-column:1}}
@media(max-width:355px){.game-left{width:calc(100% - 92px)}.game-right{width:92px;flex-basis:92px}.board-heading{font-size:8px}.control-btn span{font-size:18px}.control-btn small{font-size:6px}.score-bottom{font-size:8px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* SEO guide pages reuse the original site style; no external assets or JavaScript. */
.intro-seo{font-size:13px;line-height:2;color:#4e5b59;max-width:650px;margin:17px 0 0}
.guide-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:25px}
.guide-links a{background:var(--white);border:1px solid var(--line);padding:20px 17px;display:flex;flex-direction:column;gap:11px;min-height:180px;transition:border-color .15s}
.guide-links a:hover{border-color:var(--jade)}
.guide-links span{font:700 10px/1.5 ui-monospace,monospace;color:var(--jade)}
.guide-links strong{font-size:15px;line-height:1.65}
.guide-links small{font-size:11px;color:var(--sub);line-height:1.75}
.guide-article{max-width:790px;margin:44px auto 85px}
.breadcrumbs{font-size:11px;color:var(--sub);margin-bottom:30px;line-height:1.6}
.breadcrumbs a{text-decoration:underline;text-underline-offset:2px}
.breadcrumbs span{margin:0 9px}
.guide-article h1{font-size:clamp(26px,4.5vw,40px);line-height:1.45;letter-spacing:-.02em;margin:15px 0 14px}
.guide-lead{font-size:15px;color:#475857;line-height:2.05;border-bottom:2px solid var(--ink);padding-bottom:30px}
.guide-article section{padding:23px 0 12px;border-bottom:1px solid var(--line)}
.guide-article h2{font-size:clamp(18px,2.5vw,23px);line-height:1.5;margin:12px 0 16px}
.guide-article p{font-size:14px;line-height:2.15;color:#4c5b58}
.guide-article a:not(.cta-link){text-decoration:underline;text-underline-offset:3px;color:var(--jade)}
.guide-table-scroll{overflow:auto;border:1px solid var(--line);background:var(--white)}
.guide-table{width:100%;border-collapse:collapse;font-size:13px;line-height:1.7;min-width:390px}
.guide-table th{text-align:left;background:#e7eae2;padding:12px;border-bottom:1px solid #cbd0c7}
.guide-table td{padding:11px 12px;border-bottom:1px solid var(--line)}
.guide-table tr:last-child td{border-bottom:none}
.guide-note{background:#e8ebe2;padding:11px 16px}
.faq-list details{border-bottom:1px solid var(--line);padding:6px 0}
.faq-list details:last-child{border-bottom:0}
.faq-list summary{font-weight:750;cursor:pointer;font-size:14px;padding:15px 3px;line-height:1.5}
.faq-list details p{margin:0;padding:0 4px 17px}
.guide-cta{padding:22px 27px 31px;margin:45px 0 0;background:#1e2d2f;color:#f7f5ef}
.guide-cta h2{margin:8px 0}.guide-cta p{color:#d1d8d3;margin:10px 0 25px}
.cta-link{display:inline-flex;align-items:center;justify-content:space-between;gap:20px;background:#e5b06a;color:#172927!important;font-size:14px;font-weight:850;text-decoration:none!important;padding:14px 19px}
@media(max-width:740px){.guide-links{grid-template-columns:1fr}.guide-links a{min-height:unset;padding:15px;gap:8px}.guide-article{margin-top:30px}.guide-cta{padding:18px}}
@media(max-width:640px){.site-header nav{gap:9px}.site-header nav a{font-size:9px}.site-header nav a:nth-child(2){display:inline}.site-header nav a:nth-child(4){display:none}}
@media(max-width:350px){.site-header nav a:nth-child(3){display:none}}

/* Game-over monetization UI: no ad placement overlaps control buttons. */
.revive-btn{width:100%;max-width:215px;min-height:48px;padding:12px 9px;background:#b5d3c4;color:#16302d;border:0;border-radius:3px;font-weight:850;display:flex;align-items:center;justify-content:center;gap:7px;margin:4px 0 6px;font-size:12px;cursor:pointer}
.revive-btn:disabled{opacity:.55;cursor:default}
.game-overlay .revive-btn[hidden],.game-overlay .revive-hint[hidden],.game-overlay .revive-status[hidden]{display:none}
.game-overlay .revive-hint{font-size:10px;line-height:1.45;color:#bcd0c5;margin:0 0 12px;max-width:210px}
.game-overlay .revive-status{font-size:10px;line-height:1.5;color:#ffd4c6;margin:0 0 11px;max-width:210px}
.revive-explainer{font-size:12px;line-height:1.9;color:#60706c;margin:12px 0 0}
.reward-preview{position:fixed;inset:0;background:rgba(10,23,24,.86);z-index:1000;display:flex;align-items:center;justify-content:center;padding:20px}
.reward-preview[hidden]{display:none}
.reward-preview-card{width:min(100%,390px);border-radius:9px;background:#f5f2ea;padding:24px;display:flex;align-items:stretch;flex-direction:column;gap:13px;box-shadow:0 12px 45px #070e1038}
.reward-preview-tag{font:750 11px/1.5 ui-monospace,monospace;color:#995636}
.reward-preview-card h2{font-size:21px;line-height:1.45;margin:0}
.reward-preview-card p{font-size:13px;line-height:1.8;margin:0;color:#4a5b56}
.preview-countdown{background:#e7eae2;padding:12px;text-align:center;font:700 13px/1.5 ui-monospace,monospace}
.reward-preview-card .primary-btn{max-width:none;justify-content:center}
.reward-preview-card .primary-btn:disabled{opacity:.58;cursor:not-allowed}
.preview-cancel{border:1px solid #bac5bf;background:transparent;color:#1e2d2f;font:700 13px/1.6 sans-serif;padding:11px;cursor:pointer}
@media(max-width:640px){.game-overlay{padding:7px}.game-overlay .overlay-mark{font-size:19px;margin-bottom:13px}.game-overlay h3{font-size:17px;margin-bottom:8px}.game-overlay p{font-size:10px;margin-bottom:10px;line-height:1.55}.game-overlay .revive-btn{font-size:10px;padding:9px 3px;min-height:37px;margin:4px 0}.game-overlay .revive-hint,.game-overlay .revive-status{font-size:9px;margin-bottom:9px}.game-overlay .primary-btn{min-height:37px;padding:7px 5px;font-size:10px}.reward-preview-card{padding:20px}}