:root{--bg:#fdfaf3;--ink:#31473f;--muted:#7b857f;--accent:#62a66f;--bad:#d95f59;--panel:#fffdf8;}
*{box-sizing:border-box}
html,body{margin:0;min-height:100%;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,sans-serif}
body{display:flex;justify-content:center}
.app{width:min(100vw,780px);min-height:100vh;padding:18px 14px 30px;display:flex;flex-direction:column;gap:12px}
.head{display:flex;justify-content:space-between;align-items:end;gap:12px;padding:0 4px}
.title{font-weight:900;font-size:clamp(20px,4vw,30px);letter-spacing:.02em}
.meta{font-size:12px;color:var(--muted);text-align:right;line-height:1.45}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.stat{background:var(--panel);border:1px solid #e5e0d7;border-radius:14px;padding:9px 10px;text-align:center;box-shadow:0 2px 10px #2b3b3310}
.stat b{display:block;font-size:18px}
.stat span{font-size:11px;color:var(--muted)}
.board-wrap{position:relative;background:var(--bg);border:1px solid #e8e2d7;border-radius:22px;overflow:hidden;box-shadow:0 7px 25px #2b3b3312}
svg{display:block;width:100%;height:auto;touch-action:manipulation}
.arrow{fill:var(--ink);cursor:pointer;transform-origin:center;transition:fill .16s ease,opacity .24s ease;outline:none}
.arrow:hover{fill:#3f5b51}
.arrow:focus-visible{stroke:#86b991;stroke-width:3}
.arrow.removed{pointer-events:none;opacity:0}
.arrow.blocked{fill:var(--bad)}
.flash{position:absolute;left:50%;top:12px;transform:translateX(-50%);padding:7px 12px;border-radius:999px;background:#fff9;color:var(--ink);font-weight:800;font-size:13px;opacity:0;pointer-events:none;transition:opacity .15s}
.flash.show{opacity:1}
.cover{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#fdfaf3e6;backdrop-filter:blur(1px);z-index:5}
.cover.hidden{display:none}
.startbox{width:min(82%,380px);background:#fffdf8;border:1px solid #ded8cc;border-radius:20px;padding:22px;text-align:center;box-shadow:0 12px 35px #2b3b3320}
.startbox h2{margin:0 0 8px;font-size:24px}
.startbox p{margin:7px 0;color:#66716b;line-height:1.55;font-size:14px}
button{font:inherit}
.primary{border:0;border-radius:14px;background:var(--accent);color:white;font-weight:900;font-size:17px;padding:12px 22px;cursor:pointer;min-width:150px}
.secondary{border:1px solid #d9d3c8;border-radius:12px;background:#fffdf8;color:var(--ink);font-weight:700;padding:8px 12px;cursor:pointer}
.controls{display:flex;justify-content:space-between;align-items:center;gap:8px;padding:0 3px}
.note{color:var(--muted);font-size:11px;line-height:1.45}
.modal{position:fixed;inset:0;background:#13201988;display:flex;align-items:center;justify-content:center;padding:20px;z-index:10}
.modal.hidden{display:none}
.card{width:min(92vw,430px);background:#fffdf8;border-radius:24px;padding:26px;text-align:center;box-shadow:0 18px 60px #0004}
.card .big{font-size:32px;font-weight:950;margin-bottom:4px}
.card .result{font-size:19px;font-weight:800;margin:12px 0 18px}
.card .buttons{display:flex;gap:8px;justify-content:center;flex-wrap:wrap}
@keyframes shake{0%,100%{transform:translateX(0)}25%{transform:translateX(-4px)}75%{transform:translateX(4px)}}
.shake{animation:shake .18s linear 2}