:root{--bg: #f7f3ea;--surface: #fffdf7;--surface-2: #fef8ed;--ink: #1f1a16;--muted: #665a4f;--line: #e3d8ca;--primary: #c4572e;--primary-ink: #fffaf7;--accent: #2d6b77;--focus: #2d6b77;font-family:"Noto Serif SC","Source Han Serif SC",Songti SC,serif}*{box-sizing:border-box}body{margin:0;min-height:100vh;color:var(--ink);background:radial-gradient(circle at 18% 0%,#fff5e5 0%,transparent 38%),radial-gradient(circle at 82% 8%,#eef7ff 0%,transparent 34%),linear-gradient(180deg,#f9f5ee 0%,var(--bg) 100%)}button,input{font:inherit}.page{width:min(860px,calc(100% - 28px));margin:26px auto 48px;display:grid;gap:12px}.hero{position:relative;padding:18px 18px 14px;border:1px solid var(--line);border-radius:16px;background:var(--surface)}.kicker{margin:0;color:var(--muted);font-size:.88rem}.hero h1{margin:8px 0 0;font-size:clamp(2.1rem,6vw,3.3rem);line-height:1;letter-spacing:0}.hero-tools{position:absolute;top:16px;right:16px;display:flex;gap:8px}.ghost{height:34px;padding:0 12px;border:1px solid var(--line);border-radius:999px;background:#fff;color:var(--muted)}.meta{margin:10px 0 0;color:var(--muted)}.desc{margin:6px 0 0}.status{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:12px 16px;border:1px solid var(--line);border-radius:12px;background:var(--surface)}.status span{color:var(--muted)}.status strong{color:var(--primary);letter-spacing:.16em}.solved{display:grid;gap:10px}.solved-item{padding:12px 14px;border:1px solid var(--line);border-radius:10px;background:#fff6e8}.solved-item h2{margin:0 0 4px;font-size:1rem}.solved-item p{margin:0;color:var(--muted)}.board{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}.tile{min-height:74px;padding:10px 6px;border:1px solid var(--line);border-radius:10px;background:var(--surface-2);color:var(--ink);font-size:1.06rem;font-weight:700;cursor:pointer;transition:background .16s ease,border-color .16s ease,transform .16s ease}.tile:hover{border-color:#d4bea6;background:#fff2de}.tile.selected{background:#ffd9b6;border-color:#f09a64;transform:translateY(-1px)}.message{min-height:24px;margin:0;color:var(--muted)}.controls,.secondary-actions{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:10px}.secondary-actions{grid-template-columns:repeat(2,minmax(0,1fr))}.controls button,.secondary-actions button,.sponsor button,.card button{min-height:42px;border-radius:10px;border:1px solid var(--line);background:var(--surface);color:var(--ink);display:inline-flex;align-items:center;justify-content:center;gap:8px;cursor:pointer}.controls button:disabled,.secondary-actions button:disabled{opacity:.46;cursor:not-allowed}.controls .primary{background:var(--primary);border-color:var(--primary);color:var(--primary-ink)}.sponsor{border:1px solid var(--line);border-radius:12px;padding:16px;background:var(--surface);display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:18px}.sponsor-copy{display:grid;gap:6px}.sponsor-label{margin:0;color:var(--primary);font-size:.86rem;font-weight:700}.sponsor h2{margin:0;font-size:clamp(1.25rem,3vw,1.72rem);line-height:1.2}.sponsor p{margin:0;color:var(--muted);line-height:1.55}.pay-code{width:clamp(150px,22vw,196px);margin:0;padding:10px 10px 8px;border:1px solid var(--line);border-radius:10px;background:#fff;box-shadow:0 10px 28px #1f1a1614;text-align:center}.pay-code img{display:block;width:100%;aspect-ratio:1 / 1.34;object-fit:cover;border-radius:7px}.pay-code figcaption{margin-top:8px;color:var(--muted);font-size:.9rem}.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.card{border:1px solid var(--line);border-radius:12px;padding:14px;background:var(--surface);display:grid;gap:8px;align-content:start}.card .label{margin:0;color:var(--muted)}.card h3{margin:0;font-size:1.2rem}.card p{margin:0;color:var(--muted);line-height:1.55}.card label{color:var(--muted)}.card input{min-height:42px;padding:0 12px;border-radius:10px;border:1px solid var(--line);background:#fff}button:focus-visible,input:focus-visible,.tile:focus-visible{outline:3px solid color-mix(in srgb,var(--focus),white 20%);outline-offset:2px}@media(max-width:820px){.board,.controls{grid-template-columns:repeat(2,minmax(0,1fr))}.cards{grid-template-columns:1fr}}@media(max-width:520px){.page{width:min(100%,calc(100% - 18px));margin-top:16px}.hero{padding-right:12px}.hero-tools{position:static;margin-top:12px}.secondary-actions{grid-template-columns:1fr}.sponsor{grid-template-columns:1fr;align-items:flex-start}.pay-code{width:min(100%,240px)}}