:root{color:#172033;background:#eef3f7;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;--ink: #172033;--muted: #637083;--line: #d6dee8;--paper: #ffffff;--panel: rgba(255, 255, 255, .86);--a: #2277a8;--b: #b7542f;--danger: #d73a49;--ok: #16875b}*{box-sizing:border-box}body{margin:0;min-width:320px;min-height:100vh}button,select{font:inherit}button{border:0}.app-shell{min-height:100vh;padding:24px;background:linear-gradient(135deg,rgba(34,119,168,.13),transparent 34%),linear-gradient(225deg,rgba(183,84,47,.14),transparent 32%),#eef3f7}.hero-bar{display:flex;align-items:center;justify-content:space-between;max-width:1480px;margin:0 auto 18px;gap:16px}.hero-bar h1,.player-header h2,.referee-status h2,.result-modal h2{margin:0;letter-spacing:0}.hero-bar h1{font-size:clamp(2rem,5vw,4rem);line-height:1}.eyebrow{margin:0 0 5px;color:var(--muted);font-size:.72rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase}.hero-badge,.progress-pill,.stat-row span,.status-icon{display:inline-flex;align-items:center;gap:7px}.hero-badge{min-height:42px;padding:0 14px;border:1px solid rgba(23,32,51,.12);border-radius:8px;background:#ffffffc2;font-weight:800}.arena{display:grid;grid-template-columns:minmax(360px,1fr) minmax(260px,320px);gap:18px;max-width:1480px;margin:0 auto;align-items:start}.player-panel,.referee-panel,.result-modal{border:1px solid rgba(23,32,51,.12);border-radius:8px;background:var(--panel);box-shadow:0 18px 48px #1720331f;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px)}.player-panel{padding:18px}.player-left{border-top:5px solid var(--a)}.player-right{border-top:5px solid var(--b)}.player-header{display:flex;align-items:start;justify-content:space-between;gap:12px;margin-bottom:12px}.player-header h2,.referee-status h2{font-size:1.45rem}.progress-pill{min-width:72px;justify-content:center;padding:8px 10px;border-radius:999px;background:#edf6f5;color:#14614d;font-weight:900}.stat-row{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:14px;color:var(--muted);font-size:.92rem;font-weight:700}.stat-row span{min-height:34px;padding:0 10px;border-radius:8px;background:#1720330d}.sudoku-board{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));width:min(100%,560px);aspect-ratio:1;margin:0 auto;border:3px solid var(--ink);background:var(--ink);gap:1px}.sudoku-cell{position:relative;display:grid;place-items:center;min-width:0;min-height:0;padding:0;background:#fbfdff;color:var(--ink);cursor:pointer;transition:background .13s ease,box-shadow .13s ease,transform .13s ease}.sudoku-cell:nth-child(3n){border-right:2px solid var(--ink)}.sudoku-cell:nth-child(9n){border-right:0}.sudoku-cell:nth-child(n+19):nth-child(-n+27),.sudoku-cell:nth-child(n+46):nth-child(-n+54){border-bottom:2px solid var(--ink)}.sudoku-cell:hover{background:#eef7fb}.sudoku-cell.is-given{background:#e6ecf2;font-weight:900}.sudoku-cell.is-selected{z-index:1;background:#d7effb;box-shadow:inset 0 0 0 3px #2277a8}.sudoku-cell.is-peer{background:#d9ecff;box-shadow:inset 0 0 0 2px #4a90e2c7}.sudoku-cell.is-peer .cell-value{color:#0b5ca8;font-weight:900;text-shadow:0 0 .4px rgba(11,92,168,.35)}.sudoku-cell.is-error{background:#ffe6e8;color:var(--danger);box-shadow:inset 0 0 0 2px #d73a49ad}.sudoku-cell.is-complete{background:#e7f6ef}.cell-value{font-size:clamp(1rem,3.6vw,2.1rem);line-height:1;font-weight:800}.notes-grid{display:grid;grid-template-columns:repeat(3,1fr);width:82%;height:82%;color:#708093;font-size:clamp(.45rem,1vw,.7rem);font-weight:800;line-height:1}.notes-grid span{display:grid;place-items:center}.mode-toggle{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin:14px 0 10px}.mode-toggle button,.number-button,.clear-button,.primary-action,.secondary-action,.floating-reset{min-height:42px;border-radius:8px;cursor:pointer;font-weight:900}.mode-toggle button{background:#17203312;color:var(--muted)}.mode-toggle button.active{background:var(--ink);color:#fff}.number-pad{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}.number-button{background:#fff;color:var(--ink);border:1px solid var(--line);font-size:1.05rem}.number-button.is-active{background:#263049;color:#fff;box-shadow:inset 0 0 0 1px #ffffff29}.number-button.is-active:disabled{opacity:1;background:#1b2436;color:#fff}.number-button:active:not(:disabled),.clear-button:active:not(:disabled),.mode-toggle button:active:not(:disabled),.primary-action:active:not(:disabled),.secondary-action:active:not(:disabled),.floating-reset:active:not(:disabled){transform:translateY(1px)}.clear-button{display:inline-flex;grid-column:span 1;align-items:center;justify-content:center;gap:6px;background:#273448;color:#fff}button:disabled,select:disabled{cursor:not-allowed;opacity:.58}.referee-panel{position:sticky;top:18px;padding:18px}.referee-status{display:flex;align-items:center;gap:12px}.status-icon{justify-content:center;width:42px;height:42px;border-radius:8px;background:#273448;color:#fff}.timer-display{margin:18px 0 2px;padding:16px;border-radius:8px;background:#101827;color:#fff;font-size:clamp(2.4rem,6vw,3.5rem);font-weight:900;line-height:1;text-align:center;font-variant-numeric:tabular-nums}.puzzle-id{margin:0 0 16px;color:var(--muted);font-size:.86rem;text-align:center}.difficulty-label{display:block;margin-bottom:7px;color:var(--muted);font-size:.86rem;font-weight:900}.difficulty-select{width:100%;min-height:42px;padding:0 10px;border:1px solid var(--line);border-radius:8px;background:#fff;color:var(--ink);font-weight:800}.referee-actions,.result-actions{display:grid;gap:9px;margin-top:14px}.primary-action,.secondary-action,.floating-reset{display:inline-flex;align-items:center;justify-content:center;gap:7px}.primary-action{background:#11785d;color:#fff}.secondary-action{border:1px solid var(--line);background:#fff;color:var(--ink)}.rule-box{display:grid;gap:6px;margin-top:16px;padding:12px;border-radius:8px;background:#11785d1a;color:#315247;font-size:.9rem;line-height:1.5}.floating-reset{position:fixed;right:24px;bottom:24px;padding:0 14px;background:var(--ink);color:#fff;box-shadow:0 12px 30px #17203338}.result-backdrop{position:fixed;inset:0;display:grid;place-items:center;padding:24px;background:#090e1694;z-index:20}.result-modal{width:min(460px,100%);padding:26px;text-align:center}.result-modal svg{color:#c78b16}.result-modal p{color:var(--muted);line-height:1.55}.result-grid{display:grid;grid-template-columns:1fr 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