:root{color-scheme:light;--paper:#f7f3ea;--ink:#243f36;--muted:#57695e;--line:#d6decb;--green:#2d7059;--mint:#d2f2dd;--peach:#f1caa1;--serif:Georgia,'Times New Roman',serif;font-family:Arial,'PingFang TC','Microsoft JhengHei',sans-serif;color:var(--ink);background:var(--paper)}*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 30% 15%,#e8efe260,transparent 50%),radial-gradient(ellipse at 100% 0,#f1dcc950,transparent 50%);min-height:100vh}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default;opacity:.45}button,a,input,select{touch-action:manipulation}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #b46630;outline-offset:4px}a{color:inherit;text-underline-offset:4px}.topbar{max-width:1280px;margin:auto;display:flex;align-items:center;justify-content:space-between;padding:27px 42px;gap:20px}.logo img{width:206px;height:auto;display:block}.top-tools{display:flex;align-items:center;gap:28px;font-size:13px}.top-tools>a{text-decoration:none}.language{display:flex;align-items:center;gap:10px}.language>span{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}select{appearance:none;-webkit-appearance:none;min-height:42px;padding:10px 36px 10px 16px;border:1px solid var(--line);border-radius:24px;background:var(--paper) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='m1 1 5 5 5-5' fill='none' stroke='%23243f36' stroke-width='1.5'/%3E%3C/svg%3E") no-repeat right 13px center;color:var(--ink)}main{max-width:1120px;margin:auto;padding:0 34px}.intro{text-align:center;padding:28px 0 32px}.eyebrow{font-size:10px;font-weight:600;letter-spacing:.2em}.intro h1{font-family:var(--serif);font-size:clamp(48px,6vw,72px);font-weight:500;letter-spacing:-.055em;margin:14px 0 18px;line-height:1}.intro h1 span{color:var(--green)}.intro h2{font-size:clamp(19px,2.5vw,24px);font-weight:500;letter-spacing:-.03em;margin:12px 0}.intro>p:last-child{font-size:14px;color:var(--muted);line-height:1.8;max-width:640px;margin:12px auto}.game-tabs{display:flex;justify-content:center;gap:10px;margin:0 auto 28px}.game-tabs button{display:flex;align-items:center;gap:12px;padding:12px 23px;border:1px solid var(--line);border-radius:40px;background:#fcfaf4;color:var(--muted);min-height:58px;font-size:15px}.game-tabs button[aria-pressed=true]{background:var(--ink);border-color:var(--ink);color:#fff;box-shadow:0 7px 20px #243f3612}.tab-icon{font-family:var(--serif);font-size:25px;line-height:1}.code-icon{letter-spacing:2px;font-family:Arial;font-size:19px}.collection-panel{margin-bottom:24px}.collection-top{display:flex;align-items:baseline;justify-content:space-between;margin-bottom:14px;gap:15px}.collection-top h2{font-size:16px;font-weight:500;margin:0}.collection-top>span{font-size:12px;color:var(--muted)}.rounds{display:grid;grid-template-columns:repeat(10,minmax(0,1fr));gap:8px}.rounds button{border:1px solid var(--line);background:#fbfaf4;border-radius:13px;min-height:48px;color:var(--muted);position:relative;font-size:14px;font-variant-numeric:tabular-nums}.rounds button[aria-current=step]{background:#deebd8;border-color:#8aaa8d;color:#243f36;box-shadow:inset 0 0 0 1px #8aaa8d}.rounds button.done::after{content:'✓';font-size:10px;position:absolute;right:7px;top:4px;color:#2d7059}.rounds button.helped::after{content:'☆'}.play-grid{display:grid;grid-template-columns:minmax(0,1fr) 280px;gap:24px;align-items:start}.game-board{border:1px solid #458668;border-radius:24px;padding:30px;background:linear-gradient(130deg,#2c6a56,#32765a 70%,#357a5e);color:white;box-shadow:0 18px 38px -28px #173e36;min-width:0}.board-meta{display:flex;justify-content:space-between;align-items:center;gap:12px;font-size:11px;letter-spacing:.12em;margin-bottom:24px}.difficulty{letter-spacing:0;background:#ffffff12;border:1px solid #ffffff30;border-radius:20px;padding:5px 10px;color:#ecf5e9}.game-board h2{font-family:var(--serif);font-size:clamp(25px,3vw,34px);font-weight:400;margin:0 0 12px;line-height:1.25;letter-spacing:-.025em}.rules{font-size:13px;line-height:1.85;color:#e9f4ec;margin:0;max-width:590px}.start-line{display:flex;align-items:center;gap:8px;margin-top:18px;font-size:11px;color:#e0f1e6;flex-wrap:wrap}.mini-card{display:inline-grid;place-items:center;min-width:25px;height:29px;padding:2px 5px;background:#ffffff12;border:1px solid #ffffff30;border-radius:5px;font-size:13px}.cards{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:27px 0 20px;align-items:stretch}.cards button{min-width:0;min-height:112px;border:2px solid #ffffff50;border-radius:14px;background:#f9f8ec;color:var(--ink);box-shadow:0 5px 0 #173e362c;position:relative;padding:24px 6px 15px;font-family:var(--serif);font-size:clamp(27px,4vw,39px);overflow-wrap:anywhere}.cards button[aria-pressed=true]{background:#e7f8d7;border-color:#ffc999;transform:translateY(-4px);box-shadow:0 9px 0 #173e362c}.selection-order{position:absolute;top:5px;left:7px;font:11px Arial;color:#304f3e;background:#dfb993;border-radius:20px;width:17px;height:17px;display:grid;place-items:center}.card-expression{display:block;font:11px Arial;line-height:1.4;margin-top:8px;opacity:.85}.pick-status{min-height:32px;font-size:13px;text-align:center;line-height:1.7;margin:8px 0;color:#fff}.operations{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:9px;max-width:330px;margin:auto}.operations button{height:48px;border:1px solid #b4ddbe;border-radius:10px;background:var(--mint);color:#173e30;font-size:24px}.operations button:hover:not(:disabled){background:#e5fae9}.swap{display:block;margin:13px auto 0;background:transparent;border:0;color:#f5f7df;font-size:12px;min-height:36px;text-decoration:underline;text-underline-offset:4px}.board-bottom{border-top:1px solid #ffffff24;margin-top:24px;padding-top:20px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap}.plain-action{background:transparent;color:inherit;border:1px solid #ffffff60;border-radius:25px;font-size:12px;padding:9px 15px;min-height:40px}.win{margin:16px 0 0;padding:14px;border-radius:12px;background:#d6efbd;color:#244429;line-height:1.7;font-size:14px}.notice{font-size:13px;line-height:1.8;margin:15px 0;color:#ffe5c4}.sidebar{min-width:0;display:grid;gap:18px}.side-card{padding:23px;border:1px solid var(--line);border-radius:18px;background:#fcfaf4}.side-card h3{font-size:13px;font-weight:600;margin:0 0 16px}.trail{padding:0 0 0 19px;margin:0;font-size:13px;line-height:2.2;overflow-wrap:anywhere}.empty{font-size:13px;line-height:1.8;color:var(--muted);margin:0}.hint-actions{display:flex;flex-direction:column;gap:10px}.hint-button{background:#f2e8d9;border:1px solid #d9c7b0;color:#594734;border-radius:10px;min-height:43px;padding:10px 13px;text-align:left;font-size:13px}.hint-button.secondary{background:transparent;border-color:var(--line);color:var(--muted)}.help-note{font-size:11px;line-height:1.8;color:var(--muted);margin:13px 0 0}.help-output{font-size:13px;line-height:1.9;background:#f0f2e6;border-radius:10px;padding:12px;margin:13px 0 0;overflow-wrap:anywhere}.help-output:empty{display:none}.help-flag{font-size:11px;color:#6c5739;margin-top:12px}.next{border:0;border-radius:24px;background:var(--ink);color:white;min-height:42px;padding:11px 20px;margin-top:16px}.next-wrap{display:flex;justify-content:flex-end}.last-note{font-size:12px;line-height:1.8;color:var(--muted)}.code-inputs{display:grid;grid-template-columns:repeat(var(--digits),minmax(0,1fr));gap:10px;margin:26px 0 15px;max-width:470px}.code-inputs input{width:100%;min-width:0;height:77px;text-align:center;border:2px solid #ffffff60;background:#faf7ea;color:var(--ink);border-radius:12px;font-size:32px;font-family:var(--serif);caret-color:#2d7059}.code-inputs input:focus{border-color:#efbc80;outline-color:#f1caa1}.submit-guess{min-height:46px;background:var(--mint);color:#163e2c;border:1px solid #a1d6b5;border-radius:11px;padding:11px 24px;font-size:14px;width:100%;max-width:470px}.form-caption{font-size:11px;line-height:1.7;color:#e9f4ec;margin-top:12px}.clue-note{font-size:12px;line-height:1.8;color:var(--muted)}.ledger-wrap{border:1px solid var(--line);border-radius:18px;background:#fcfaf4;padding:24px;margin-top:24px}.ledger-wrap h3{font-size:15px;font-weight:500;margin:0 0 14px}.ledger-scroll{overflow-x:auto;max-height:370px}.ledger{border-collapse:collapse;width:100%;font-size:13px;table-layout:fixed}.ledger th{text-align:left;font-weight:400;color:var(--muted);font-size:11px;line-height:1.6;border-bottom:1px solid var(--line);padding:0 6px 12px}.ledger td{padding:13px 6px;border-bottom:1px solid #d6decb88}.ledger td:first-child{font-size:17px;letter-spacing:.16em;font-variant-numeric:tabular-nums;font-family:monospace}.ledger tbody tr:first-child{background:#edf1e3}.count-pill{display:inline-block;border:1px solid var(--line);background:#f1f1e5;min-width:30px;text-align:center;padding:4px 7px;border-radius:20px}.count-pill.placed{background:#dceddb;border-color:#bdd5bf}.privacy{text-align:center;font-size:11px;color:var(--muted);margin:28px 0}.original{border-top:1px solid var(--line);margin:38px 0 0;padding:27px 0;display:flex;align-items:center;justify-content:space-between;gap:20px;font-size:13px}.original p{color:var(--muted)}.save-error{padding:15px;background:#ffe6cf;color:#653500;border:1px solid #d6a578;border-radius:12px;font-size:13px;line-height:1.7}footer{max-width:1120px;margin:20px auto 0;padding:25px 34px 35px;display:flex;justify-content:space-between;font-size:10px;letter-spacing:.06em;color:var(--muted);gap:20px}[hidden]{display:none!important}
/* A locked result is still content: keep numbers readable after finishing. */
.cards button:disabled,.code-inputs input:disabled{opacity:1;color:var(--ink);-webkit-text-fill-color:currentColor}
.game-tabs .tab-icon{flex-shrink:0}.game-tabs button>[data-text]{min-width:0;overflow-wrap:anywhere}
select{padding-right:40px;background-position:right 16px center}select option{color:var(--ink);background:var(--paper)}
@media(max-width:800px){.play-grid{grid-template-columns:minmax(0,1fr)}.sidebar{grid-template-columns:1fr 1fr}.topbar{padding:22px 25px}.top-tools{gap:14px}.logo img{width:160px}main{padding:0 24px}.intro{padding-top:22px}.game-board{padding:26px}.cards button{min-height:120px}.original{align-items:flex-start}.game-tabs button{padding:12px 22px}}
@media(max-width:480px){.topbar{padding:18px 18px}.logo img{width:130px}.top-tools>a{display:none}select{font-size:12px;max-width:140px;padding-left:13px}main{padding:0 16px}.intro{padding:18px 0 25px}.intro h1{font-size:48px}.intro h2{font-size:20px}.intro>p:last-child{font-size:13px}.game-tabs{gap:8px;margin-bottom:24px}.game-tabs button{padding:10px 16px;min-width:0;font-size:13px;gap:9px}.rounds{grid-template-columns:repeat(5,minmax(0,1fr));gap:7px}.rounds button{min-height:43px}.collection-top{font-size:12px}.game-board{padding:22px 17px;border-radius:19px}.board-meta{font-size:10px;margin-bottom:20px;letter-spacing:.07em}.game-board h2{font-size:27px}.rules{font-size:12px}.cards{gap:7px}.cards button{min-height:98px;font-size:28px;border-radius:10px;padding-top:24px}.card-expression{font-size:9px}.sidebar{grid-template-columns:1fr}.play-grid{gap:17px}.side-card{padding:20px}.code-inputs{gap:7px}.code-inputs input{height:64px;font-size:28px}.original{flex-direction:column;gap:4px}.ledger-wrap{padding:20px 12px}.ledger th{font-size:10px}.ledger td:first-child{font-size:16px;letter-spacing:.12em}.ledger th:first-child{width:40%}.board-bottom{gap:8px}.plain-action{padding:8px 11px}footer{padding:22px 16px;flex-direction:column;gap:10px}}
@media(prefers-reduced-motion:no-preference){button{transition:background .14s,transform .14s,box-shadow .14s}}@media(forced-colors:active){select{appearance:auto;background-image:none}.game-board,.cards button{border:1px solid CanvasText}.rounds button[aria-current=step],button[aria-pressed=true]{outline:2px solid Highlight}}
.mode-bar{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin:0 0 22px}.mode-tabs,.length-tabs{display:flex;align-items:center;gap:6px;flex-wrap:wrap}.mode-tabs{padding:4px;background:#ecefe4;border:1px solid var(--line);border-radius:14px}.mode-tabs button,.length-tabs button{min-height:40px;padding:9px 15px;border:1px solid transparent;border-radius:10px;background:transparent;color:var(--muted);font-size:13px}.mode-tabs button[aria-pressed=true],.length-tabs button[aria-pressed=true]{background:#fffdf6;color:var(--ink);border-color:var(--line);box-shadow:0 2px 5px #243f3609}.length-tabs>span{font-size:11px;margin-right:6px}.free-note{font-size:12px;line-height:1.8;color:var(--muted);margin:-5px 0 20px}.next-wrap{align-items:center;justify-content:space-between;gap:12px}.next-wrap>.next:only-child{margin-left:auto}.previous{font-size:12px;color:var(--muted);border:0;background:transparent;min-height:42px;text-decoration:underline;text-underline-offset:4px;margin-top:16px}.last-note{margin-left:auto}.game-board:focus-within{scroll-margin-top:20px}@media(max-width:480px){.mode-tabs{width:100%;justify-content:center}.mode-tabs button{flex:1;padding:9px}.length-tabs{width:100%;justify-content:flex-end}.next-wrap{flex-wrap:wrap}.game-board{padding:20px 16px}.board-meta{letter-spacing:.04em}.cards{gap:8px}.code-inputs{gap:7px}}