@font-face{font-family:BukoJapanese;src:url('/assets/noto-sans-jp-0.ttf') format('truetype');font-weight:400;font-display:swap}
@font-face{font-family:BukoJapanese;src:url('/assets/noto-sans-jp-1.ttf') format('truetype');font-weight:500;font-display:swap}
@font-face{font-family:BukoJapanese;src:url('/assets/noto-sans-jp-2.ttf') format('truetype');font-weight:600;font-display:swap}
@font-face{font-family:BukoJapanese;src:url('/assets/noto-sans-jp-3.ttf') format('truetype');font-weight:700;font-display:swap}
@font-face{font-family:BukoJapanese;src:url('/assets/noto-sans-jp-4.ttf') format('truetype');font-weight:800;font-display:swap}
:root{--font:"BukoJapanese","Hiragino Sans","Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,Arial,sans-serif;color-scheme:light}html:lang(en),html:lang(fil),html:lang(es),html:lang(fr),html:lang(de),html:lang(it),html:lang(vi){--font:Inter,"Segoe UI",Arial,sans-serif}html:lang(zh-CN){--font:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif}html:lang(zh-TW){--font:"PingFang TC","Microsoft JhengHei","Noto Sans CJK TC",sans-serif}html:lang(zh-HK){--font:"PingFang HK","Microsoft JhengHei","Noto Sans CJK HK",sans-serif}html:lang(ko){--font:"Apple SD Gothic Neo","Malgun Gothic","Noto Sans KR",sans-serif}
*{box-sizing:border-box}body,button,input,select,textarea{font-family:var(--font)}body{margin:0;color:#172b35;background:#f8f9f5;-webkit-font-smoothing:antialiased}button,a,input,select{touch-action:manipulation}a{color:inherit}button,select{cursor:pointer}a:focus-visible,button:focus-visible,select:focus-visible{outline:3px solid #237c72;outline-offset:4px}header.site-header{max-width:1200px;margin:auto;padding:28px 36px;display:flex;align-items:center;justify-content:space-between;gap:20px}.brand{font:800 25px/1 Arial,sans-serif;letter-spacing:-1px;text-decoration:none;display:inline-flex;align-items:center;gap:10px;color:#172b35}.brand-symbol{display:inline-flex;align-items:center;gap:3px;transform:rotate(-12deg)}.brand-symbol i{display:block;width:8px;border-radius:4px;background:#287b71;height:22px}.brand-symbol i:nth-child(2){height:30px;background:#e3af4f}.brand-symbol i:nth-child(3){height:17px;background:#e6867a}.language-select{font-size:13px;font-weight:600;color:#314b54;background:transparent;border:1px solid #cddad6;border-radius:8px;padding:9px 28px 9px 10px;max-width:190px;min-height:40px}.portal{max-width:1200px;margin:auto;padding:28px 36px 40px}.portal-hero{display:grid;grid-template-columns:1.06fr 1fr;align-items:center;gap:44px;padding:36px 0 60px}.eyebrow{display:flex;align-items:center;gap:10px;color:#36796d;font-size:13px;font-weight:700;letter-spacing:.04em;margin:0 0 22px}.eyebrow:before{content:'';width:26px;height:2px;background:currentColor}.hero-copy h1{font-size:clamp(32px,3.7vw,48px);font-weight:800;line-height:1.5;letter-spacing:-.035em;white-space:pre-line;margin:0 0 22px;overflow-wrap:anywhere}.hero-description{color:#53676c;font-size:15px;line-height:1.95;max-width:470px;margin:0 0 32px}.primary-link{display:inline-flex;align-items:center;justify-content:center;gap:24px;border-radius:10px;padding:16px 24px;background:#236d61;color:#fff;font-size:15px;font-weight:700;text-decoration:none;box-shadow:0 5px 0 #19564d;transition:transform .15s,box-shadow .15s}.primary-link:hover{transform:translateY(-2px);box-shadow:0 7px 0 #19564d}.primary-link span:last-child{font:22px/1 Arial,sans-serif}.puzzle-art{position:relative;background:#e6eeea;border-radius:30px;padding:34px 22px 24px;min-width:0;overflow:hidden}.puzzle-art:before{content:'';position:absolute;width:220px;height:220px;border:1px solid #cbdad1;border-radius:50%;right:-75px;top:-90px}.art-caption{position:relative;color:#568075;font:600 12px/1.4 Arial,sans-serif;letter-spacing:.12em;display:flex;align-items:center;justify-content:space-between;margin:0 10px 26px}.art-caption span:last-child{width:7px;height:7px;border-radius:50%;background:#367d6d}.puzzle-art svg{position:relative;display:block;width:100%;height:auto}.how-panel{border-top:1px solid #dce4df;display:grid;grid-template-columns:repeat(3,1fr);gap:32px;padding:32px 0}.how-step{display:flex;align-items:center;gap:16px;font-size:14px;font-weight:600;color:#3c555c;line-height:1.7}.step-number{font:600 12px/1 Arial,sans-serif;color:#368075;background:#e8f0e9;width:32px;height:32px;border-radius:50%;display:grid;place-items:center;flex:none}.portal-footer{max-width:1200px;margin:auto;padding:22px 36px 30px;border-top:1px solid #e1e8e3;display:flex;gap:20px;justify-content:space-between;color:#687d80;font:12px/1.6 Arial,sans-serif}.portal-footer a{text-decoration:none}.portal-footer a:hover{text-decoration:underline}
/* The solver keeps its board rendering and control IDs. */
body.solver{--bg:#f8f9f5;--panel:#fff;--fg:#172b35;--muted:#586e75;--line:#d3dfd9;--accent:#236d61;--accent-fg:#fff;--sel:#e4f0e8;--warn:#ab432a;--table:#152f33;font-family:var(--font)}body.solver .wrap{max-width:820px;padding:8px 24px 56px;gap:16px}body.solver .site-header{max-width:820px;padding:22px 24px 20px}.solver-heading{display:flex;justify-content:space-between;gap:16px;align-items:flex-start;margin-bottom:8px}.solver-heading h1{font-family:var(--font);font-size:clamp(21px,4vw,28px);font-weight:800;line-height:1.5;letter-spacing:-.025em;text-wrap:initial}.solver-heading .sub{font-size:13px;line-height:1.9;max-width:600px;margin-top:10px}body.solver .tabs{gap:0;border-bottom:1px solid #d0ddd6}body.solver .tabs button{border:0;border-radius:0;background:transparent;color:#70827f;padding:12px 5px;font-weight:600;min-width:0}body.solver .tabs button.on{background:transparent;color:#236d61;border-bottom:3px solid #236d61}body.solver .table{border-radius:18px;padding:12px}body.solver #shareA{align-self:flex-start;border:0;background:transparent;font-size:12px;color:#36796d;min-height:28px;padding:0 2px}body.solver button{border-width:1px;font-size:14px;line-height:1.5}body.solver button.pri{box-shadow:0 3px 0 #194e46}body.solver #colset>summary{border:1px solid #d3dfd9;font-size:14px}body.solver .meta{border-radius:10px;background:#f8f9f5}body.solver .ask{border-color:#a4cbb9;background:#fff}body.solver .table svg{font-family:var(--font)}body.solver .num{font-size:12px}body.solver .num b{font-size:15px}body.solver .num button{min-width:34px;min-height:34px}.solver-back{font-size:12px;color:#59726c;text-decoration:none}.solver-back:hover{text-decoration:underline}
@media(max-width:720px){header.site-header{padding:22px 20px}.brand{font-size:23px}.language-select{max-width:150px;font-size:12px}.portal{padding:12px 22px 24px}.portal-hero{grid-template-columns:1fr;gap:36px;padding:20px 0 30px}.hero-copy h1{font-size:clamp(30px,7.6vw,44px);line-height:1.55;margin-bottom:18px}.hero-description{font-size:14px;line-height:1.9;margin-bottom:24px;max-width:none}.eyebrow{margin-bottom:16px;font-size:12px}.primary-link{width:100%;gap:20px}.puzzle-art{max-width:490px;width:100%;justify-self:center;padding:25px 20px 12px;border-radius:22px}.art-caption{margin-bottom:12px}.how-panel{gap:18px;padding:24px 0;grid-template-columns:1fr}.how-step{font-size:13px;gap:13px}.portal-footer{padding:20px 22px;font-size:11px}body.solver .wrap{padding-inline:16px}body.solver .site-header{padding:20px 16px 16px}body.solver .brand{font-size:22px}.solver-heading h1{font-size:22px}.solver-heading .sub{font-size:12px}body.solver .table{padding:6px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}