:root{color-scheme:light;--bg:#f1f1f1;--paper:#fff;--ink:#111;--muted:#626262;--line:#c7c7c7;--key:#bdbdbd;--changed:#bac8df}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,system-ui,"Segoe UI",Roboto,Oxygen,Ubuntu,Cantarell,"Helvetica Neue",sans-serif;font-size:16px;line-height:1.5}
a{color:inherit}
button,input{font:inherit}
button{cursor:pointer}
button:disabled{cursor:not-allowed;opacity:.5}
.sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}
.shell{width:min(1080px,calc(100% - 32px));margin-inline:auto}
main.shell{width:100%;max-width:none;padding:0 16px 80px}
.topbar{background:var(--bg);border-bottom:1px solid #b6b6b6}
.header-main{height:75px;max-width:1080px;margin:auto;display:flex;align-items:center;justify-content:center;position:relative}
.brand{font-size:36px;font-weight:800;letter-spacing:-.045em;text-decoration:none;white-space:nowrap;line-height:1}
.brand span:not(.brand-emoji){font-size:.58em;letter-spacing:-.025em}
.brand-emoji{font-size:.78em;letter-spacing:0}
.header-puzzle{position:absolute;bottom:3px;color:var(--muted);font-size:14px}
.desktop-nav{min-height:34px;display:flex;align-items:center;justify-content:center;gap:25px}
.desktop-nav a,.mobile-menu a{color:#5a5a5a;text-decoration:none;font-size:13px}
.desktop-nav a:hover,.desktop-nav a[aria-current=page],.mobile-menu a[aria-current=page]{color:var(--ink);text-decoration:underline}
.mobile-menu{display:none}
h1,h2,h3,p{margin-top:0}
h1{font-size:clamp(32px,4vw,48px);line-height:1.15;letter-spacing:-.04em;margin-bottom:14px}
h2{font-size:clamp(23px,2.5vw,30px);line-height:1.2;letter-spacing:-.025em;margin-bottom:14px}
h3{font-size:19px}
p{color:var(--muted)}
.eyebrow{display:inline-block;color:#666;font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.08em;margin-bottom:10px}
.game-screen{min-height:calc(100dvh - 110px);max-width:1080px;margin:auto;display:flex;flex-direction:column;align-items:center;padding:22px 0 18px}
.game-intro{text-align:center;min-height:54px}
.game-page-title{font-size:21px;letter-spacing:-.02em;margin:0 0 3px}
.game-intro p{font-size:14px;margin:0;color:#666}
.game-board-wrap{width:100%;flex:1;min-height:140px;display:flex;align-items:flex-start;justify-content:center;overflow:hidden}
.game-board{display:flex;flex-direction:column;align-items:center;gap:6px;max-height:min(43vh,390px);overflow-y:auto;scrollbar-width:thin;padding:12px 8px}
.game-row,.game-row .tiles{display:flex;gap:6px}
.game-row .tile{display:flex;align-items:center;justify-content:center;width:68px;height:68px;background:var(--bg);border:2px solid #777;border-radius:0;color:#111;font-size:32px;font-weight:750;line-height:1}
.game-row .tile.changed{background:var(--changed);border-color:#727f97}
.game-row.current .tile.blank{background:transparent}
.game-row.current .tile.filled{background:#fff}
.game-bottom{width:min(100%,390px);display:flex;flex-direction:column;align-items:center}
.game-message{min-height:24px;margin:0 0 9px;text-align:center;font-size:14px;color:#525252}
.game-message.error{color:#8d2c20}
.game-form{width:100%}
.game-keyboard{width:100%;user-select:none;touch-action:manipulation}
.keyboard-row{display:flex;justify-content:center;gap:5px;margin-bottom:6px}
.key{flex:1;max-width:39px;height:43px;padding:0;border:0;border-radius:2px;background:var(--key);color:#111;font-size:14px;font-weight:750}
.key:hover,.key:focus-visible{background:#aaa}
.key:active{background:#919191}
.key.wide{flex:1.6;max-width:65px;font-size:12px}
.game-actions{display:flex;justify-content:center;gap:18px;flex-wrap:wrap;margin-top:8px;font-size:13px}
.game-actions button,.game-actions a{padding:4px 0;border:0;background:none;color:#696969;text-decoration:underline}
.game-actions button:hover,.game-actions a:hover{color:#111}
.difficulty{display:flex;align-items:center;gap:12px;margin-top:10px;font-size:13px;color:#555}
.difficulty>div{display:flex;gap:5px}
.chip{border:1px solid #aaa;background:#e7e7e7;padding:4px 10px;border-radius:2px;font-size:12px;color:#333}
.chip.active{background:#333;color:#fff;border-color:#333}
.note-card{max-width:760px;margin:24px auto;padding:22px;background:#fafafa;border:1px solid var(--line)}
.note-card p:last-child{margin-bottom:0}
.main-grid{max-width:980px;margin:64px auto 0;display:grid;grid-template-columns:minmax(0,1.6fr) minmax(245px,.8fr);gap:24px;align-items:start}
.hints-card,.side-card,.analysis-card{background:#fafafa;border:1px solid var(--line);padding:26px}
.section-heading p{margin-bottom:10px}
.hint{border-top:1px solid #d5d5d5}
.hint summary{display:flex;align-items:center;gap:14px;min-height:65px;cursor:pointer;list-style:none;font-weight:700}
.hint summary::-webkit-details-marker{display:none}
.hint-number{font-size:13px;color:#555}
.hint-plus{margin-left:auto;font-size:23px;font-weight:400;color:#666}
.hint[open] .hint-plus{transform:rotate(45deg)}
.hint-body{padding:0 0 18px 30px;color:#333}
.hint-explain{display:inline-block;margin-left:10px}
.side-card h2{margin-top:4px}
.side-card p{font-size:15px}
.side-divider{height:1px;background:#d0d0d0;margin:22px 0}
.text-link{display:inline-block;font-weight:700;text-decoration:underline;text-underline-offset:3px}
.text-link:hover{color:#7b4c28}
.next-puzzle,.analysis-card,.recent-puzzles,.route-links,.faq{max-width:980px;margin-left:auto;margin-right:auto}
.next-puzzle{margin-top:15px;font-size:14px;text-align:right}
.analysis-card{margin-top:30px}
.analysis-card p{margin-bottom:12px}
.analysis-details{border-top:1px solid #d0d0d0;padding-top:13px}
.analysis-details summary,.faq summary{cursor:pointer;font-weight:700}
.analysis-details>div{padding-top:18px}
.analysis-details p:last-child{margin-bottom:0}
.move-explanation{padding-left:23px;margin:0}
.move-explanation li{margin:0 0 11px}
.recent-puzzles,.route-links,.faq{margin-top:48px}
.recent-puzzles>div{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin:18px 0}
.recent-puzzles>div a{display:flex;justify-content:space-between;gap:6px;padding:11px 12px;border:1px solid var(--line);background:#fafafa;text-decoration:none;font-size:14px}
.recent-puzzles>div a:hover,.link-cards a:hover{background:#e3e3e3}
.recent-puzzles>div span{font-size:12px;color:#666}
.link-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}
.link-cards a{position:relative;min-height:100px;border:1px solid var(--line);background:#fafafa;padding:18px;text-decoration:none}
.link-cards strong{display:block;font-size:18px}
.link-cards span{display:block;color:#666;font-size:14px;margin-top:4px;padding-right:20px}
.link-cards b{position:absolute;right:17px;bottom:14px;font-weight:400}
.faq{padding-bottom:40px}
.faq details{border-top:1px solid #ccc;padding:14px 0}
.faq details p{margin:12px 0 0}
.hero,.simple-page,.explanation,.tool-card,.archive-list,.pagination,.adjacent{max-width:980px;margin-left:auto;margin-right:auto}
.hero{padding:45px 0 32px;border-bottom:1px solid var(--line)}
.hero.compact h1{font-size:clamp(30px,3.7vw,44px)}
.lede{font-size:17px}
.puzzle-header{display:flex;justify-content:space-between;align-items:center;gap:24px}
.word-pair{display:flex;align-items:center;gap:12px;flex-shrink:0}
.word-pair>div{text-align:center}
.word-pair>div>span:first-child{display:block;font-size:12px;color:#666;margin-bottom:8px}
.pair-arrow{font-size:22px;color:#666;padding-top:18px}
.tiles{display:inline-flex;gap:4px;vertical-align:middle}
.tile{display:inline-flex;align-items:center;justify-content:center;width:41px;height:48px;background:var(--bg);border:2px solid #777;border-radius:0;color:#111;font-size:22px;font-weight:750;line-height:1}
.tile.changed{background:var(--changed);border-color:#727f97}
.hero.compact+.hints-card{max-width:980px;margin:28px auto 0}
.in-hero{margin-top:20px;justify-content:flex-start}
.explanation{margin-top:36px;padding:0 0 10px}
.actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:22px}
.button{display:inline-flex;align-items:center;justify-content:center;min-height:42px;padding:9px 14px;border:1px solid #777;background:#eee;text-decoration:none;font-size:14px;font-weight:700}
.button.primary{background:#333;color:#fff;border-color:#333}
.button:hover{background:#ddd}
.button.primary:hover{background:#111}
.adjacent{display:flex;justify-content:space-between;gap:20px;border-top:1px solid #ccc;padding-top:17px;margin-top:34px}
.adjacent a{font-weight:700;text-decoration:none}
.simple-page{padding:48px 0 22px}
.simple-page p{font-size:17px}
.information-page{max-width:760px;min-height:55vh}
.information-page a{font-weight:700}
.guide-steps{padding-left:24px;color:#555}
.guide-steps li{margin:0 0 13px}
.guide-steps strong{color:#111}
.tool-card{background:#fafafa;border:1px solid var(--line);padding:26px}
.word-form label{display:block;font-weight:700;margin-bottom:10px}
.word-form>div{display:flex;gap:9px}
.word-form input{height:45px;max-width:100%;width:210px;padding:8px 11px;border:2px solid #777;background:#fff;border-radius:0;text-transform:uppercase;letter-spacing:.12em}
.word-form input:focus-visible,.key:focus-visible,.button:focus-visible,summary:focus-visible,a:focus-visible,button:focus-visible{outline:3px solid #5b78a5;outline-offset:2px}
.tool-result{border-top:1px solid var(--line);margin-top:24px;padding-top:20px;min-height:60px}
.ladder{list-style:none;padding:0;margin:14px 0 0;display:flex;flex-wrap:wrap;gap:8px}
.ladder li{display:flex;align-items:center;gap:7px;padding:5px 8px;border:1px solid #ccc;background:#fafafa}
.ladder .tile{width:28px;height:32px;font-size:17px}
.step-no,.change-note{font-size:12px;color:#666}
.archive-intro{padding-bottom:5px}
.archive-list{border-top:1px solid #bbb}
.archive-item{display:grid;grid-template-columns:60px minmax(0,1fr) 90px 68px;align-items:center;gap:12px;min-height:62px;padding:10px 15px;border-bottom:1px solid #ccc}
.archive-item:hover{background:#e7e7e7}
.archive-num,.archive-date{color:#666;font-size:14px}
.archive-answer{text-decoration:none}
.archive-answer strong{font-size:17px}
.archive-answer strong span{font-weight:400;color:#777}
.archive-answer:hover,.archive-replay:hover{text-decoration:underline}
.archive-replay{font-size:14px;font-weight:700;text-decoration:none}
.pagination{display:flex;align-items:center;justify-content:space-between;padding:22px 0;color:#666;font-size:14px}
.pagination a{font-weight:700;text-decoration:none}
.footer{border-top:1px solid #bbb;background:#ebebeb}
.footer-row{min-height:76px;display:flex;justify-content:space-between;align-items:center;gap:20px}
.footer p{font-size:13px;margin:0}
.footer nav{display:flex;flex-wrap:wrap;gap:14px}
.footer a{font-size:13px;color:#555;text-decoration:underline}
@media(max-width:900px){.main-grid{grid-template-columns:1fr}.puzzle-header{align-items:flex-start;flex-direction:column}.recent-puzzles>div{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:600px){main.shell{padding:0 12px 60px}.header-main{height:43px;padding:0 8px;justify-content:space-between}.brand{font-size:16px;letter-spacing:-.025em}.brand span:not(.brand-emoji){font-size:1em}.brand-emoji{font-size:1em}.header-puzzle{position:static;font-size:14px;white-space:nowrap}.desktop-nav{display:none}.mobile-menu{display:block;position:relative;z-index:5}.mobile-menu summary{list-style:none;cursor:pointer;font-size:13px;color:#555;text-decoration:underline}.mobile-menu summary::-webkit-details-marker{display:none}.mobile-menu nav{position:absolute;right:0;top:27px;width:170px;display:flex;flex-direction:column;padding:8px;background:#f7f7f7;border:1px solid #aaa;box-shadow:0 8px 20px #0002}.mobile-menu nav a{padding:9px;font-size:15px}.game-screen{min-height:calc(100dvh - 43px);padding:16px 0 10px}.game-intro{min-height:49px}.game-page-title{font-size:18px}.game-intro p{font-size:13px}.game-board{max-height:42vh;padding:4px 5px}.game-row .tile{width:63px;height:63px;font-size:30px}.game-bottom{width:100%}.key{height:42px;max-width:none}.key.wide{max-width:none}.game-actions{gap:14px;font-size:12px}.difficulty{margin-top:4px}.main-grid{margin-top:48px}.hints-card,.side-card,.analysis-card,.tool-card{padding:20px}.recent-puzzles,.route-links,.faq{margin-top:38px}.link-cards{grid-template-columns:1fr}.link-cards a{min-height:82px}.hero .word-pair{max-width:100%;gap:5px}.hero .word-pair .tiles{gap:3px}.hero .word-pair .tile{width:32px;height:39px;font-size:18px}.hero .pair-arrow{font-size:17px}.simple-page{padding:34px 0 18px}.simple-page p{font-size:16px}.word-form>div{flex-wrap:wrap}.word-form input{flex:1;min-width:165px}.archive-item{grid-template-columns:40px minmax(0,1fr) 50px;gap:7px;padding:11px 5px}.archive-date{display:none}.archive-answer strong{font-size:15px}.archive-replay{font-size:13px}.recent-puzzles>div a{display:block}.footer-row{align-items:flex-start;flex-direction:column;padding:20px 0}.footer nav{gap:11px}}
@media(max-width:360px){.game-row .tile{width:56px;height:56px}.keyboard-row{gap:3px}.key{font-size:12px}.key.wide{font-size:11px}.header-puzzle{font-size:12px}.brand{font-size:14px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}