:root{font-family:system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;color-scheme:dark;--bg:#123d43;--text:#f6f8e7;--mint:#addfbd;--yellow:#ffd376;--muted:#a5c7c4}*{box-sizing:border-box}html{background:var(--bg);min-height:100%}body{margin:0;min-height:100svh;color:var(--text);background:radial-gradient(ellipse at 50% 5%,#285852,var(--bg) 70%);overscroll-behavior:none}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;cursor:pointer;touch-action:manipulation}button:focus-visible,a:focus-visible{outline:3px solid #ffe391;outline-offset:3px}.app{width:min(100%,460px);margin:0 auto;padding:max(12px,env(safe-area-inset-top)) 14px max(12px,env(safe-area-inset-bottom))}.topbar{height:48px;display:flex;align-items:center;gap:7px;margin-bottom:15px}.icon-button{width:44px;height:44px;flex-shrink:0;border:1px solid #5d837d66;border-radius:15px;background:#2d555466;display:grid;place-items:center;font-size:23px;color:#e0eddb;text-decoration:none}.icon-button:hover{background:#466b60}.icon-button[aria-pressed=true]{color:var(--yellow)}.home{font-size:28px;margin-right:4px}.brand{flex:1;display:flex;align-items:center;gap:6px;white-space:nowrap}.brand>span{font-size:30px;color:var(--yellow);font-weight:900}.brand h1{font-size:20px;letter-spacing:.04em;margin:0;font-weight:800}.levelbar{display:flex;align-items:center;gap:12px;height:57px;margin-bottom:12px}.level-pill{height:48px;background:#345953;border:1px solid #76908066;border-radius:14px;padding:0 12px;display:flex;align-items:center;gap:4px}.level-pill b{font-size:22px;color:var(--yellow)}.level-pill span{font-size:13px;color:#b7d2c8}.level-pill span:last-child{font-size:19px;margin-left:4px}.level-title{flex:1;min-width:0}.level-title h2{margin:0 0 4px;font-size:18px}.level-title p{margin:0;font-size:12px;letter-spacing:.13em;color:var(--muted)}.dog-counter{background:#486248;color:#edecbb;padding:9px 10px;border-radius:12px;font-size:14px;white-space:nowrap}.board-shell{position:relative;width:100%;aspect-ratio:400/560;border-radius:27px;overflow:hidden;border:1px solid #bed8bb;box-shadow:0 20px 50px #041e2945;background:#dcf0e8}canvas{display:block;width:100%;height:100%;touch-action:none;cursor:crosshair}.board-ui{position:absolute;top:15px;left:17px;right:17px;display:flex;align-items:center;justify-content:space-between;gap:5px;pointer-events:none;color:#426866;font-size:13px;font-weight:600}.timer{display:flex;align-items:center;justify-content:center;background:#fcfff0dd;border:1px solid #a9c5ad;border-radius:30px;min-width:68px;padding:6px 10px;color:#385852;font-size:15px;font-variant-numeric:tabular-nums}.timer.urgent{background:#ffcda7;color:#7f432c;border-color:#efac72}.ink-row{display:flex;align-items:center;gap:10px;padding:15px 5px 0}.ink-label{display:flex;align-items:center;gap:6px;font-size:12px;color:#c9ded0;white-space:nowrap}.ink-label i{display:block;width:6px;height:12px;background:#aeddbe;border-radius:5px 5px 2px 2px;transform:rotate(25deg)}.ink-track{flex:1;height:7px;background:#092b344f;border-radius:99px;overflow:hidden}#ink-fill{height:100%;width:100%;background:#bbdfaf;border-radius:99px;transition:width .06s}#ink-fill.low{background:#ffd376}#ink-number{width:39px;font-size:12px;font-variant-numeric:tabular-nums;color:#d7e8d2;text-align:right}.caption{display:flex;gap:9px;align-items:flex-start;min-height:45px;margin:12px 5px 0}.caption>span{font-size:22px;color:var(--yellow);line-height:1}.caption p{margin:0;font-size:14px;line-height:1.6;color:#d7e6d7}.toolbar{display:flex;align-items:center;justify-content:space-between;gap:8px;padding-right:10px}.toolbar button{border:0;background:transparent;min-height:46px;padding:0 8px;display:flex;align-items:center;gap:5px;font-size:14px;color:#e0ecd7}.toolbar button>span{font-size:24px;color:#b1d1bb}.one-stroke{font-size:12px;color:#8fb7ad;letter-spacing:.03em}.overlay{position:absolute;inset:0;z-index:5;padding:20px;display:flex;align-items:center;justify-content:center;background:#19434466;backdrop-filter:blur(6px)}.hidden{display:none!important}.modal{width:100%;max-height:100%;overflow:auto;background:#f6f8e9;border:1px solid #fff;border-radius:25px;text-align:center;padding:25px 21px;color:#234b4c;box-shadow:0 20px 60px #153f4855}.modal .symbol{font-size:44px;line-height:1.2;color:#d69333;margin-bottom:12px}.modal .stars{font-size:31px;letter-spacing:6px;color:#eab957;margin-bottom:13px}.modal .eyebrow{font-size:12px;color:#6d8e7c;letter-spacing:.16em}.modal h2{font-size:25px;margin:10px 0 12px}.modal p{font-size:14px;line-height:1.7;color:#648178;margin:0 0 19px}.modal .primary,.modal .secondary{display:block;min-height:48px;width:100%;padding:12px;margin-top:9px;font-size:15px;font-weight:750;border-radius:14px;border:0}.modal .primary{background:#2d6863;color:#f8f6db;box-shadow:0 4px #1b4549}.modal .primary:active{transform:translateY(2px);box-shadow:0 2px #1b4549}.modal .secondary{background:#e1ecdb;color:#466559;border:1px solid #ccdcbc}.level-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin:15px 0}.level-choice{min-height:58px;background:#e1ecdb;border:1px solid #bfd2b7;border-radius:12px;color:#3b675d;font-size:20px;font-weight:750}.level-choice span{font-size:10px;color:#c79945;display:block;letter-spacing:1px}.level-choice.current{border:2px solid #5c9880}.toast{position:absolute;left:20px;right:20px;bottom:18px;padding:12px 14px;background:#254f50ed;color:#fcf7da;border-radius:14px;box-shadow:0 6px 20px #40686133;font-size:14px;line-height:1.5;opacity:0;transform:translateY(10px);transition:opacity .15s,transform .15s;pointer-events:none}.toast.show{opacity:1;transform:translateY(0)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}@media(min-width:700px){.app{width:440px;padding-top:max(25px,env(safe-area-inset-top))}.topbar{margin-bottom:20px}body:before{content:"";position:fixed;inset:0;pointer-events:none;background-image:radial-gradient(#89b6a51c 1px,transparent 1px);background-size:26px 26px}}@media(max-width:350px){.app{padding:max(8px,env(safe-area-inset-top)) 10px max(8px,env(safe-area-inset-bottom))}.brand h1{font-size:18px}.brand>span{display:none}.topbar{gap:5px;margin-bottom:10px}.levelbar{gap:9px}.level-title h2{font-size:16px}.level-pill{padding:0 9px}.dog-counter{font-size:13px;padding:8px}.one-stroke{font-size:11px;letter-spacing:0}.modal{padding:20px 14px}.overlay{padding:12px}.modal h2{font-size:22px}.board-ui{font-size:12px}.ink-row{padding-top:12px}.caption{margin-top:10px}}@media(prefers-reduced-motion:reduce){*{transition:none!important}}

.chapter-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:6px;margin:12px 0}.chapter-choice{min-height:43px;border:1px solid #c4d4bb;border-radius:9px;background:#e8eee0;color:#4d6b60;font-size:11px;padding:5px 2px}.chapter-choice span{display:block;font-size:9px;margin-top:3px;color:#839876}.chapter-choice.selected{background:#2d6863;color:#fff3cd;border-color:#2d6863}.chapter-choice.selected span{color:#cce1bd}.chapter-heading{font-size:13px;color:#58786a;margin:14px 0 6px;font-weight:650}.level-grid{gap:6px;margin:9px 0 14px}.level-choice{min-height:51px;font-size:18px}.modal:has(.chapter-grid){padding:18px 16px}.modal:has(.chapter-grid) h2{margin:7px 0}.modal:has(.chapter-grid) p{font-size:12px;margin-bottom:10px}.level-title h2{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.level-title p{letter-spacing:.02em}@media(max-width:350px){.modal:has(.chapter-grid){padding:15px 11px}.chapter-grid{gap:4px}.level-grid{gap:4px}.chapter-choice{font-size:10px}.level-choice{font-size:16px}.level-pill{padding:0 7px}.levelbar{gap:7px}.level-title h2{font-size:14px}.dog-counter{font-size:12px;padding:7px}}

/* Compact two-view chapter navigation keeps all touch controls comfortable. */
.chapter-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:7px}.chapter-choice{min-height:44px;font-size:12px;padding:5px 4px}.chapter-choice span{font-size:10px}.chapter-pager{display:grid;grid-template-columns:44px minmax(0,1fr) 44px;gap:6px;align-items:center;margin:12px 0}.modal .chapter-pager .secondary{min-height:44px;margin:0;padding:5px;font-size:12px}.modal .chapter-pager .secondary:first-child,.modal .chapter-pager .secondary:last-child{font-size:25px}.chapter-pager button:disabled{opacity:.35;cursor:default}.modal:has(.chapter-pager){padding:20px 16px}.modal:has(.chapter-pager) p{margin-bottom:12px}.level-choice{min-height:54px}.modal:has(.chapter-grid) .eyebrow{letter-spacing:.07em}
/* Four columns leave scrollbar room on narrow phones; both views stay bounded. */
.level-grid,.chapter-grid{grid-template-columns:repeat(5,minmax(0,1fr))}
.level-choice,.chapter-choice{min-width:0;overflow-wrap:anywhere}
@media(max-width:350px){.level-grid,.chapter-grid{grid-template-columns:repeat(4,minmax(0,1fr))}}