:root{color-scheme:dark;--bg:#101d36;--panel:#172640;--line:#344057;--muted:#a5b2c8;--gold:#efd08c;--cream:#f4f0e5}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--cream);font-family:system-ui,-apple-system,'Apple SD Gothic Neo','Malgun Gothic',sans-serif}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;border:1px solid var(--line);background:transparent;border-radius:8px;padding:13px 18px;cursor:pointer;min-height:44px}button:hover{background:#ffffff0c;border-color:var(--gold)}button:disabled{opacity:.45;cursor:default}a{color:inherit;text-decoration:none}a:hover{text-decoration:underline}button:focus-visible,a:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--gold);outline-offset:4px}[hidden]{display:none!important}header{max-width:1320px;margin:auto;padding:28px 40px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{font-weight:700;letter-spacing:-.5px}.brand 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300px;gap:38px}.canvas-panel{background:#dcd8cc;color:#344057;border-radius:10px;padding:22px;box-shadow:0 15px 50px #050e2030}.panel-top{display:flex;justify-content:space-between;font-size:11px;letter-spacing:1px;padding-bottom:20px}.board-wrap{position:relative}#board{display:grid;aspect-ratio:4/3;gap:3px;background:#8b8c86;border:5px solid #bebdb3;border-radius:3px;overflow:hidden}.tile{padding:0;border:0;border-radius:0;min-height:0;background-image:url('assets/starry-night-play.jpg');position:relative;touch-action:manipulation}.tile:hover{filter:brightness(1.08)}.tile.selected{box-shadow:inset 0 0 0 5px #ffe19b;z-index:1;filter:brightness(1.14)}.tile:focus-visible{outline-offset:-5px}.tile.correct:after{content:'✦';position:absolute;bottom:4px;right:5px;color:#ffe4a3;font-size:16px;text-shadow:0 1px 4px 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infinite}@keyframes fall{to{transform:translateY(540px) rotate(200deg);opacity:0}}@keyframes shine{to{transform:scale(1.15);text-shadow:0 0 40px #efca8b}}.mobile{display:none}@media(min-width:1400px){.intro{padding-top:65px}.workspace{gap:48px}}@media(max-width:850px){header{padding:20px}main{padding:0 20px}.workspace{grid-template-columns:1fr 250px;gap:20px}h1{font-size:37px}.signature{padding-right:20px}.canvas-panel{padding:14px}.art-note{flex-wrap:wrap}.art-note p{margin:0}footer{padding:0 20px 25px;flex-wrap:wrap}}@media(max-width:650px){header{align-items:flex-start;gap:12px;flex-direction:column}nav{gap:24px}.intro{padding:26px 0 20px}h1{font-size:33px}.signature{font-size:38px;padding-right:0}.signature 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