:root{--gold:#c9a84c;--gold-dark:#a8893a;--gold-soft:#f3ead3;--blue:#5b7db1;--blue-light:#64b5f6;--blue-deep:#3f5c8a;--blue-soft:#e8eef7;--error:#e53935;--success:#4caf50;--bg:#fafaf7;--surface:#fff;--text:#2b2b33;--text-soft:#6b6b76;--border:#e3e3dd;--shadow:0 4px 16px #2b2b331a;--shadow-soft:0 2px 8px #2b2b330f;--radius:16px;--radius-sm:10px;--font:system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif}[data-theme=dark]{--bg:#17171f;--surface:#23232e;--text:#ecece6;--text-soft:#a0a0ae;--border:#3a3a48;--blue-soft:#2a3347;--gold-soft:#3b3323;--shadow:0 4px 16px #00000073;--shadow-soft:0 2px 8px #00000059}[data-theme=dark] .cell-candidate:hover{background:#38455f}[data-theme=dark] .level-node-locked{background:#2c2c37}[data-theme=dark] .difficulty-btn-done,[data-theme=dark] .world-card-badge-done{color:#7bc47f;background:#24382a}[data-theme=dark] .tutorial-done{color:#7bc47f}[data-theme=dark] .cell.error-confirmed{background:#3f2427}[data-theme=dark] .cell.error-eliminated{background:#3f3524}*{box-sizing:border-box}html,body{height:100%;margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:var(--font);-webkit-font-smoothing:antialiased;overflow-x:hidden}#app{flex-direction:column;min-height:100dvh;display:flex}button{cursor:pointer;font-family:inherit}img{-webkit-user-drag:none;-webkit-user-select:none;user-select:none}.btn{border-radius:var(--radius-sm);border:none;padding:12px 24px;font-size:1rem;font-weight:600;transition:transform 80ms,box-shadow .15s,background-color .15s}.btn:active{transform:scale(.97)}.btn-primary{background:var(--gold);color:#fff;box-shadow:var(--shadow-soft)}.btn-primary:hover{background:var(--gold-dark)}.btn-secondary{background:var(--surface);color:var(--blue);border:2px solid var(--blue)}.btn-secondary:hover{background:var(--blue-soft)}.overlay-backdrop{z-index:100;background:#2b2b3373;justify-content:center;align-items:center;padding:16px;animation:.18s overlay-fade;display:flex;position:fixed;top:0;bottom:0;left:0;right:0}.overlay-card{background:var(--surface);border-radius:var(--radius);border-top:6px solid var(--gold);box-shadow:var(--shadow);text-align:center;width:100%;max-width:420px;padding:28px 24px;animation:.2s overlay-pop}@keyframes overlay-fade{0%{opacity:0}to{opacity:1}}@keyframes overlay-pop{0%{opacity:0;transform:scale(.94)}to{opacity:1;transform:scale(1)}}.overlay-title{color:var(--text);margin:0 0 10px;font-size:1.35rem}.overlay-body{color:var(--text-soft);white-space:pre-line;margin-bottom:20px;font-size:.97rem;line-height:1.45}.overlay-actions{flex-direction:column;gap:10px;display:flex}.overlay-actions .btn{width:100%}.stamp-inline,.topbar-icon-inline,.star-inline{object-fit:contain;vertical-align:-.12em;width:1em;height:1em;display:inline-block}.toast{background:var(--blue);color:#fff;box-shadow:var(--shadow);z-index:200;border-radius:999px;padding:10px 22px;font-size:.95rem;animation:.2s overlay-fade;position:fixed;bottom:28px;left:50%;transform:translate(-50%)}