@font-face{font-family:Nunito;src:url('nunito.ttf') format('truetype');font-weight:200 1000;font-display:swap}
:root{font-family:Nunito,system-ui,sans-serif;color:#0d1b35;background:#f6f8fa;font-synthesis:none;--board-height:min(600px,calc(100svh - 248px))}
*{box-sizing:border-box}body{margin:0}button,a,summary{-webkit-tap-highlight-color:transparent}button{font:inherit;color:inherit;cursor:pointer;min-height:44px;border:1px solid #d5dce5;background:#fff;border-radius:10px;font-size:16px;font-weight:800;touch-action:manipulation}button:hover{background:#e0f8f9;border-color:#009ba3}button:active{background:#c8eff0}button:disabled{opacity:.45;cursor:default}a{color:inherit}button:focus-visible,a:focus-visible,summary:focus-visible,.board-frame:focus-visible{outline:3px solid #7b2fbe;outline-offset:4px}.topbar{max-width:1160px;margin:auto;min-height:72px;padding:12px 28px;display:flex;align-items:center;justify-content:space-between;gap:16px;border-bottom:1px solid #e2e8f0}.topbar img{object-fit:contain;height:auto;display:block}.topbar a:last-child{text-decoration:none;font-weight:800;font-size:16px}.eyebrow{font-size:14px;letter-spacing:1.7px;text-transform:uppercase;font-weight:900;margin:0;color:#4a5568}main{max-width:820px;margin:auto;padding:24px 24px 0}.heading{display:flex;align-items:flex-end;justify-content:space-between;gap:20px;margin-bottom:20px}.heading h1{font-size:44px;line-height:1.1;letter-spacing:-2px;margin:5px 0 0;font-weight:900}.heading h1 span{color:#009ba3}.heading>p{font-size:18px;color:#4a5568;margin:0 0 3px}.game-shell{display:flex;justify-content:center;gap:20px}.play-column{width:calc(var(--board-height)/2);flex-shrink:0}.mobile-stats{height:46px;display:flex;align-items:center;justify-content:space-between;font-size:16px;color:#4a5568}.mobile-stats strong{font-weight:900;color:#0d1b35;margin-left:4px;font-variant-numeric:tabular-nums}.board-frame{height:var(--board-height);width:100%;position:relative;background:#0d1b35;border-radius:12px;overflow:hidden;box-shadow:0 14px 35px #0d1b3518;touch-action:none;user-select:none;-webkit-user-select:none}#game-canvas{height:100%;width:100%}#game-canvas canvas{display:block!important;width:100%!important;height:100%!important}.overlay{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:20px;background:#0d1b35ed;color:#fff;gap:16px}.overlay[hidden]{display:none}.overlay .eyebrow{color:#77e4df}.overlay h2{font-size:32px;letter-spacing:-1px;line-height:1.1;margin:0;max-width:100%}.overlay p{font-size:18px;line-height:1.5;margin:0}.overlay .overlay-hint{font-size:16px;color:#c6d0de}.primary{background:#87efd2;color:#0d1b35;border:0;min-height:52px;padding:0 32px;width:100%}.primary:hover{background:#aff8e4}.touch-buttons{display:grid;grid-template-columns:1fr 1fr 1fr 1.7fr;gap:6px;margin-top:10px}.touch-buttons button{font-size:24px;height:46px}.touch-buttons .drop-button{font-size:16px;background:#0d1b35;color:white;border-color:#0d1b35}.sidebar{width:142px;padding-top:46px;display:flex;flex-direction:column;gap:12px}.preview-card{border:1px solid #e2e8f0;border-radius:12px;background:#fff;padding:14px}.preview-card h2{margin-bottom:12px}.next-pieces{display:flex;flex-direction:column;gap:12px}.piece-preview{width:84px;height:42px;position:relative;margin:auto;display:flex;justify-content:center;align-items:center;color:#4a5568}.mini-block{position:absolute;width:18px;height:18px;border-radius:3px;border:1px solid #0d1b3555;box-shadow:inset 0 2px 0 #ffffff66}.utilities{display:grid;gap:6px}.small-note{font-size:16px;color:#4a5568;text-align:center;line-height:1.5;margin:0}.instructions{text-align:center;font-size:16px;color:#4a5568;margin:22px auto;line-height:1.6}.instructions p{margin:4px 0}.instructions strong{color:#0d1b35}.instructions summary{cursor:pointer;min-height:44px;padding:10px}.instructions details p{max-width:580px;margin:10px auto}.toast{position:absolute;top:42%;left:8px;right:8px;text-align:center;color:#fff;font-size:26px;font-weight:900;pointer-events:none;text-shadow:0 2px 12px #0d1b35;background:#0d1b35cf;border-radius:8px;opacity:0;padding:8px}.toast.visible{opacity:1}footer{display:flex;justify-content:center;gap:20px;flex-wrap:wrap;padding:20px 16px;font-size:16px;color:#4a5568;border-top:1px solid #e2e8f0}.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(max-width:600px){:root{--board-height:min(600px,calc(100svh - 250px),calc((100vw - 122px)*2))}.topbar{min-height:56px;padding:10px 16px}.topbar img{width:80px}.topbar>.eyebrow{display:none}main{padding:14px 12px 0}.heading{margin-bottom:6px;align-items:flex-start;flex-direction:column;gap:6px}.heading .eyebrow{display:none}.heading h1{font-size:32px;margin:0}.heading>p{font-size:16px;text-align:left;line-height:1.3}.game-shell{gap:10px}.mobile-stats{font-size:16px;height:40px}.mobile-stats strong{margin-left:2px}.sidebar{width:88px;padding-top:40px;gap:8px}.preview-card{padding:10px 5px}.eyebrow{font-size:14px;letter-spacing:1px}.preview-card h2{text-align:center;margin-bottom:8px}.next-pieces{gap:8px}.piece-preview{width:76px;height:36px}.utilities{gap:5px}.utilities button{font-size:16px;padding:0 2px}.small-note{display:none}.overlay{padding:14px;gap:12px}.overlay h2{font-size:28px}.overlay p{font-size:16px}.touch-buttons{gap:4px}.instructions{margin:16px 0}.instructions>p:first-child{max-width:340px;margin:auto}.toast{font-size:22px}}
@media(max-height:700px){:root{--board-height:min(480px,calc((100vw - 122px)*2))}.next-pieces .piece-preview:last-child{display:none}.heading{margin-bottom:4px}.sidebar{gap:6px}.preview-card{padding-top:8px;padding-bottom:8px}.small-note{display:none}}
@media(max-width:360px){.touch-buttons{grid-template-columns:repeat(4,1fr)}.touch-buttons .drop-button{font-size:24px}.drop-button span{display:none}.mobile-stats{font-size:16px;gap:4px}.mobile-stats span{display:flex;flex-direction:column;line-height:1.1;text-align:center}.mobile-stats strong{margin:0}}
.topbar img{width:48px;height:48px}.small-note{display:none}
@media(max-width:600px){.topbar img{width:36px;height:36px}}
@media(max-width:360px){.heading>p{display:none}.heading h1{white-space:nowrap}}

.question-card{width:min(460px,calc(100% - 24px));max-height:calc(100svh - 24px);padding:24px;border:2px solid #0d1b35;border-radius:20px;color:#0d1b35;background:#f6f8fa;box-shadow:0 20px 70px #0d1b3540;text-align:left;overflow-y:auto;overscroll-behavior:contain}
.question-card::backdrop{background:#0d1b3538}
.question-card h2{font-size:26px;line-height:1.2;letter-spacing:-.5px;margin:14px 0}
.question-card p:not(.eyebrow){font-size:18px;line-height:1.45;margin:12px 0 18px}
.question-card h2:focus{outline:none}
.question-card #answer-summary{font-size:16px;color:#4a5568}
.answer-choices{display:grid;gap:10px}
.answer-choices button{min-height:52px;padding:12px;text-align:left;border-color:#8b99ab;line-height:1.4}
.question-card [hidden]{display:none}
.question-card .primary{padding:10px 12px}
.piece-choices{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
.piece-choices button{padding:16px 2px 12px;display:flex;flex-direction:column;align-items:center;gap:12px}
.piece-choices .piece-preview{width:76px;max-width:100%}
.question-card[data-stage="piece-choice"]{margin:12px auto auto}
.question-card[data-stage="piece-choice"] #question-copy{display:none}
.question-card #answer-effect{font-size:16px;font-weight:800;background:#e2e8f0;padding:10px 12px;border-radius:8px}
.question-card[data-stage="answer"][data-verdict="incorrect"]{margin:12px auto auto}
@media(min-width:1000px){.question-card[data-stage="answer"][data-verdict="incorrect"]{width:300px;margin:140px 24px auto auto}}
@media(min-width:1000px){.question-card[data-stage="piece-choice"]{width:300px;margin:140px 24px auto auto}}
@media(max-width:360px){.question-card{padding:16px}.question-card h2{font-size:24px}}

.finished-controls-title{display:none}
.results-view .heading,.results-view .instructions{display:none}
.results{padding-top:12px;padding-bottom:28px}
.results[hidden]{display:none}
.results-heading{margin-bottom:28px}
.results-heading h1{font-size:clamp(34px,5vw,48px);letter-spacing:-1.5px;line-height:1.12;margin:12px 0}
.results-heading h1:focus{outline:none}
.results p{font-size:18px;line-height:1.5}
.results-heading .results-score{font-size:16px;color:#4a5568;margin:0 0 14px}
.results h2{font-size:26px;line-height:1.2;letter-spacing:-.5px;margin:0 0 12px}
.stack-review{display:grid;grid-template-columns:minmax(0,300px) minmax(0,1fr);gap:24px;align-items:start;margin-bottom:32px}
.final-stack{margin:0}.final-stack figcaption{font-size:16px;text-align:center;color:#4a5568;margin:10px 0}
#results-board{border-radius:12px;overflow:hidden;background:#0d1b35;aspect-ratio:1/2}
#results-board svg{display:block;width:100%;height:auto}
.junk-boundary{stroke:#ffe095;stroke-width:3}.junk-outline.is-selected .junk-boundary{stroke:#87efd2;stroke-width:5}
.stack-choices>p{font-size:16px;color:#4a5568;margin:0 0 16px}
.stack-label{border:1px solid #d5dce5;background:#fff;border-radius:12px;margin-bottom:10px;padding:4px}
.stack-label-button{border:0;width:100%;display:flex;align-items:center;gap:10px;text-align:left;padding:10px;line-height:1.4}
.stack-label-button[aria-expanded="true"]{background:#e0f8f9}
.stack-number{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:28px;height:28px;background:#0d1b35;color:#fff;border-radius:50%;font-size:16px}
.results .stack-label-note{font-size:16px;color:#4a5568;margin:2px 10px 10px}
.stack-answer-panel{padding:8px 10px}.stack-answer-panel[hidden]{display:none}
.stack-answer-panel>strong{font-size:16px;color:#4a5568}.results .stack-answer-panel p{font-size:16px;margin:6px 0 10px}
.best-answer{font-weight:900;color:#0d1b35}
.missed-review{margin-bottom:20px}.missed-card{padding:18px 20px;border:1px solid #e2e8f0;border-radius:12px;background:#fff;margin:12px 0}
.missed-card h3{font-size:20px;margin:0 0 8px}.missed-card p{margin:8px 0}.results .review-prompt{font-size:16px;color:#4a5568}
.right-review{border:1px solid #d5dce5;border-radius:12px;background:#fff;margin:20px 0;font-size:16px}
.right-review summary{cursor:pointer;min-height:52px;padding:16px;font-weight:800}.right-review ul{padding:0 24px 4px 40px}.right-review li{margin-bottom:14px}.right-review p{font-size:16px;margin:4px 0}
.next-step-tip{margin:24px 0 16px;padding:24px;background:#e0f8f9;border-radius:16px}
.results .next-step-tip .eyebrow{font-size:14px;line-height:1.4;margin:0 0 12px}.next-step-tip p:last-child{margin-bottom:0}
.next-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.next-links a{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:16px;border:1px solid #d5dce5;border-radius:12px;text-decoration:none;background:#fff;font-size:16px;font-weight:800;min-height:56px}.next-links a:hover{background:#e0f8f9}
.game-shell.is-finished{display:block;border-top:1px solid #d5dce5;padding:20px 0;margin-bottom:24px}
.game-shell.is-finished .finished-controls-title{display:block;font-size:18px;margin:0 0 12px}
.game-shell.is-finished .play-column,.game-shell.is-finished .sidebar>:not(.utilities),.game-shell.is-finished #pause{display:none}
.game-shell.is-finished .sidebar{display:block;width:auto;padding:0}.game-shell.is-finished .utilities{grid-template-columns:repeat(3,minmax(0,1fr))}
@media(max-width:600px){.stack-review{grid-template-columns:1fr;gap:20px}.final-stack{width:min(300px,100%);margin:auto}.stack-choices{width:100%}.results{padding-top:6px}.results-heading{margin-bottom:20px}.next-links{grid-template-columns:1fr}.missed-card,.next-step-tip{padding:18px}.results h2{font-size:24px}}

/* Cloak activity chrome and responsive layout. */
      .site-nav {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 100;
        display: flex;
        align-items: center;
        justify-content: flex-start;
        gap: 56px;
        padding: 0 clamp(20px, 3vw, 48px);
        height: 72px;
        background: rgba(13, 27, 53, 0.97);
        backdrop-filter: blur(8px);
        border-bottom: 1px solid rgba(0, 194, 203, 0.15);
      }

      .nav-brand {
        display: flex;
        align-items: center;
        gap: 10px;
        text-decoration: none;
      }

      .nav-logo {
        height: 90px;
        width: auto;
        display: block;
      }

      .nav-links {
        display: flex;
        align-items: center;
        justify-content: flex-end;
        flex: 1;
        gap: 40px;
        list-style: none;
      }

      .nav-links > li:last-child {
        margin-left: 12px;
      }

      .nav-links a {
        color: rgba(255, 255, 255, 0.75);
        text-decoration: none;
        font-size: 16px;
        font-weight: 500;
        transition: color 0.2s;
        letter-spacing: 0.02em;
      }

      .nav-links a:hover {
        color: var(--cyan);
      }

      .nav-cta {
        background: var(--cyan) !important;
        color: var(--navy) !important;
        padding: 8px 18px;
        border-radius: 6px;
        font-weight: 700 !important;
        transition: background 0.2s !important;
      }

      .nav-cta:hover {
        background: var(--cyan-dark) !important;
      }

      .nav-drop {
        position: relative;
      }

      .nav-drop-btn {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        background: none;
        border: 0;
        padding: 0;
        cursor: pointer;
        font-family: "Nunito", sans-serif;
        font-size: 16px;
        font-weight: 500;
        letter-spacing: 0.02em;
        color: rgba(255, 255, 255, 0.75);
        transition: color 0.2s;
      }

      .nav-drop-btn:hover {
        color: var(--cyan);
      }

      .nav-drop-btn svg {
        transition: transform 0.2s;
      }

      .nav-drop.open .nav-drop-btn svg {
        transform: rotate(180deg);
      }

      .nav-drop-menu {
        display: none;
        position: absolute;
        top: calc(100% + 14px);
        left: -12px;
        min-width: 300px;
        background: rgba(13, 27, 53, 0.98);
        border: 1px solid rgba(0, 194, 203, 0.2);
        border-radius: 12px;
        padding: 8px;
        list-style: none;
        box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
      }

      .nav-drop.open .nav-drop-menu {
        display: block;
      }

      .nav-drop-menu a,
      .nav-drop-soon {
        display: flex;
        align-items: center;
        justify-content: space-between;
        gap: 12px;
        padding: 10px 12px;
        border-radius: 8px;
        font-size: 16px;
      }

      .nav-drop-menu a:hover {
        background: rgba(0, 194, 203, 0.1);
      }

      .nav-drop-soon {
        color: rgba(255, 255, 255, 0.35);
        cursor: default;
      }

      .nav-drop-tag {
        white-space: nowrap;
        font-size: 12px;
        font-weight: 700;
        letter-spacing: 0.08em;
        text-transform: uppercase;
        color: var(--cyan);
        background: rgba(0, 194, 203, 0.12);
        border: 1px solid rgba(0, 194, 203, 0.3);
        border-radius: 100px;
        padding: 2px 8px;
        white-space: nowrap;
      }

      .nav-drop-soon .nav-drop-tag {
        color: rgba(255, 255, 255, 0.4);
        background: rgba(255, 255, 255, 0.06);
        border-color: rgba(255, 255, 255, 0.12);
      }

      .nav-toggle {
        display: none;
        background: none;
        border: 0;
        width: 44px;
        height: 44px;
        padding: 0;
        cursor: pointer;
        position: relative;
        -webkit-tap-highlight-color: transparent;
      }
      .nav-toggle span {
        position: absolute;
        left: 11px;
        right: 11px;
        height: 2px;
        background: #fff;
        transition:
          top 0.25s ease,
          transform 0.25s ease,
          opacity 0.15s ease;
      }
      .nav-toggle span:nth-child(1) {
        top: 15px;
      }
      .nav-toggle span:nth-child(2) {
        top: 21px;
      }
      .nav-toggle span:nth-child(3) {
        top: 27px;
      }
      .nav-toggle[aria-expanded="true"] span:nth-child(1) {
        top: 21px;
        transform: rotate(45deg);
      }
      .nav-toggle[aria-expanded="true"] span:nth-child(2) {
        opacity: 0;
      }
      .nav-toggle[aria-expanded="true"] span:nth-child(3) {
        top: 21px;
        transform: rotate(-45deg);
      }



.site-nav { --navy:#0d1b35; --cyan:#00c2cb; --cyan-dark:#009ba3; }
.site-nav ul { margin:0; padding-left:0; }
.site-nav .nav-drop-menu { padding:8px; }
.site-nav .nav-drop-btn { min-height:44px; border-radius:0; }
.site-nav .nav-links a { display:inline-flex;align-items:center;min-height:44px; }
.site-nav .nav-toggle:hover { background:transparent; }
.site-nav :focus-visible { outline-color:#00c2cb; }
.skip-link { position:fixed;top:-100px;left:12px;z-index:200;padding:12px 18px;background:#e0f8f9;border-radius:8px;font-size:18px;font-weight:800; }
.skip-link:focus { top:10px; }
html { scroll-padding-top:84px; }
body { font-size:18px; }
main { padding-top:96px; }
:root { --board-height:min(600px,max(376px,calc(100svh - 296px)),calc((100vw - 126px)*2)); }
.heading { flex-wrap:wrap; }
.heading h1 { font-size:clamp(32px,4vw,44px); }
.keyboard-help { display:block; }.touch-help { display:none; }
@media(any-pointer:coarse) { .keyboard-help {display:none;}.touch-help {display:block;} }
@media(max-width:1000px) {
 .site-nav {gap:16px;}
 .site-nav .nav-toggle {display:block;margin-left:auto;}
 .site-nav .nav-links {display:none;position:absolute;top:72px;left:0;right:0;flex-direction:column;align-items:stretch;gap:0;background:#0d1b35;padding:8px 0;max-height:calc(100svh - 72px);overflow:auto;}
 .site-nav .nav-links.open {display:flex;}
 .site-nav .nav-links>li:last-child {margin-left:0;}
 .site-nav .nav-links a,.site-nav .nav-drop-btn {width:100%;padding:12px 5%;}
 .site-nav .nav-drop-btn {justify-content:space-between;}
 .site-nav .nav-links a.nav-cta {width:90%;margin:8px 5%;justify-content:center;}
 .site-nav .nav-drop-menu {position:static;min-width:0;border:0;background:#162848;}
 .site-nav .nav-drop-menu a {padding:12px 8%;}
}
@media(max-width:600px) { main {padding-top:88px;} }
@media(prefers-reduced-motion:reduce) { .site-nav * {transition:none!important;} }
footer {background:#0d1b35;color:#fff;align-items:center;}
footer a {display:inline-flex;align-items:center;min-height:44px;color:#fff;}
#load-note {padding:18px;border:2px solid #d97706;border-radius:12px;background:#fff;}
[hidden] {display:none!important;}

/* Keep reading and feedback in a predictable place at each step. */
.question-card,.question-card[data-stage="piece-choice"],.question-card[data-stage="answer"][data-verdict="incorrect"] {margin:12px auto auto;}
@media(min-width:1000px) {.question-card,.question-card[data-stage="piece-choice"],.question-card[data-stage="answer"][data-verdict="incorrect"] {width:360px;margin:96px 24px auto auto;}}
.instructions table {border-collapse:collapse;width:100%;max-width:520px;margin:12px auto;background:#fff;}
.instructions td {border:1px solid #66758a;height:28px;font-size:16px;line-height:1.2;text-align:center;}
.instructions td.is-falling {background:#e0f8f9;font-weight:900;}
.instructions caption {font-size:16px;text-align:left;margin-bottom:10px;}

.mode-choice {font-size:16px;text-align:left;width:100%;font-weight:800;}
.mode-choice select {display:block;width:100%;min-height:44px;padding:8px;font:inherit;border:1px solid #66758a;border-radius:8px;background:#fff;color:#0d1b35;margin-top:4px;}
.mode-choice select:focus-visible {outline:3px solid #00c2cb;outline-offset:3px;}
.overlay {overflow-y:auto;justify-content:safe center;gap:12px;padding:16px;}
.overlay h2 {font-size:26px;}.overlay p {font-size:16px;}
@media(max-height:746px) {
 .touch-buttons {grid-template-columns:repeat(4,minmax(44px,1fr));}
 .touch-buttons .drop-button {font-size:24px;}
 .drop-button span {display:none;}
}
.next-pieces {min-height:150px;}
.utilities button {line-height:1.2;}
@media(max-width:600px) {.next-pieces {min-height:124px;}}
@media(max-height:700px) {.next-pieces {min-height:96px;}}
@media(max-height:700px) and (max-width:600px) {.next-pieces {min-height:80px;}}
.board-frame {container-type:inline-size;}
@container(max-width:230px) {
 .overlay .eyebrow,.overlay #overlay-hint {display:none;}
}
/* Match the shared activity start screen, with reading separate from the board. */
.home-view main {max-width:none;padding:0;}
.home-view .heading,.home-view .game-shell,.home-view .instructions {display:none;}
.stage-intro {min-height:100svh;padding:120px 5% 60px;display:flex;align-items:center;background:#0d1b35;color:#fff;position:relative;}
.stage-intro::before {content:'';position:absolute;inset:0;background-image:linear-gradient(#00c2cb0a 1px,transparent 1px),linear-gradient(90deg,#00c2cb0a 1px,transparent 1px);background-size:60px 60px;pointer-events:none;}
.stage-inner {position:relative;max-width:1060px;width:100%;margin:auto;display:grid;grid-template-columns:minmax(0,1fr);gap:28px;}
.back-link {display:inline-flex;align-items:center;gap:8px;min-height:44px;font-size:16px;font-weight:600;text-decoration:none;color:#c6d0de;margin-bottom:16px;}
.back-link:hover {color:#00c2cb;}
.stage-intro .eyebrow {display:inline-flex;align-items:center;gap:8px;font-size:14px;line-height:1.5;letter-spacing:.1em;color:#77e4df;border:1px solid #009ba3;border-radius:100px;padding:6px 12px;margin:0 0 18px;}
.eyebrow-dot {display:inline-block;width:6px;height:6px;flex-shrink:0;border-radius:50%;background:currentColor;}
.intro-title {font-size:clamp(40px,5.6vw,68px);line-height:1.1;font-weight:800;letter-spacing:-.02em;margin:0 0 20px;}
.intro-title span {color:#00c2cb;}
.intro-hook {font-size:clamp(20px,2.2vw,24px);font-weight:600;line-height:1.4;margin:0 0 12px;max-width:520px;}
.intro-task {font-size:18px;line-height:1.6;color:#c6d0de;max-width:520px;margin:0;}
.intro-preview {width:100%;max-width:420px;justify-self:center;}
.preview-label {font-size:14px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:#c6d0de;margin:0 0 12px;}
#intro-board {width:100%;aspect-ratio:5/6;border:1px solid #66758a;border-radius:16px;overflow:hidden;background:#162848;}
#intro-board svg {display:block;width:100%;height:auto;}
.preview-caption {font-size:16px;line-height:1.5;color:#c6d0de;margin:14px 0 0;}
.intro-cta {display:flex;flex-wrap:wrap;align-items:center;gap:12px;}
.start-button {display:inline-flex;align-items:center;justify-content:center;gap:12px;min-height:52px;padding:14px 24px;background:#00c2cb;color:#0d1b35;border:0;border-radius:8px;font-size:18px;font-weight:800;}
.start-button:hover {background:#77e4df;}
.how-link {display:inline-flex;align-items:center;gap:8px;padding:14px 10px;background:transparent;border:0;font-size:16px;font-weight:600;color:#c6d0de;text-decoration:underline;text-underline-offset:5px;}
.how-link:hover {background:transparent;color:#fff;}
.how-link span {color:#00c2cb;font-size:22px;}
.intro-controls {display:flex;align-items:center;gap:4px 20px;flex-wrap:wrap;margin-top:18px;}
.mode-toggle {display:inline-flex;align-items:center;gap:10px;min-height:44px;padding:4px 0;background:transparent;border:0;border-radius:6px;font-size:16px;font-weight:500;text-align:left;line-height:1.4;}
.intro-controls .mode-toggle {color:#c6d0de;}
.intro-controls .mode-toggle:hover {background:#162848;}
.mode-track {position:relative;width:40px;height:22px;border-radius:100px;background:#53637b;border:1px solid #8b99ab;flex-shrink:0;}
.mode-thumb {position:absolute;top:2px;left:2px;width:16px;height:16px;border-radius:50%;background:#fff;}
.mode-toggle[aria-checked='true'] .mode-track {background:#00c2cb;border-color:#00c2cb;}
.mode-toggle[aria-checked='true'] .mode-thumb {transform:translateX(18px);background:#0d1b35;}
.mode-toggle b {font-weight:600;white-space:nowrap;}
.intro-controls .mode-toggle b {color:#fff;}
.intro-mode-note {font-size:16px;color:#c6d0de;line-height:1.5;margin:10px 0 0;min-height:3em;max-width:480px;}
.also-try {display:flex;align-items:center;gap:8px 12px;flex-wrap:wrap;border-top:1px solid #53637b;padding-top:20px;}
.also-try-label {font-size:14px;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:#c6d0de;margin-right:4px;}
.also-try a {display:inline-flex;align-items:center;min-height:44px;padding:8px 14px;border:1px solid #66758a;border-radius:100px;color:#e2e8f0;text-decoration:none;font-size:16px;}
.also-try a:hover {color:#fff;border-color:#00c2cb;background:#162848;}
.stage-intro :focus-visible {outline-color:#00c2cb;}
.utilities .mode-toggle {background:#fff;border:1px solid #d5dce5;justify-content:center;padding:8px 6px;gap:6px;flex-wrap:wrap;}
.utilities .mode-toggle:hover {background:#e0f8f9;}
.utilities .mode-toggle>span:last-child {text-align:center;}
.utilities .mode-toggle b {display:block;font-weight:600;}
.game-how-link {color:#0d1b35;}.game-how-link:hover {color:#009ba3;}
.howto {width:min(580px,calc(100vw - 32px));max-height:calc(100svh - 32px);margin:auto;padding:0;border:1px solid #66758a;border-radius:20px;background:#162848;color:#fff;overflow:auto;}
.howto::backdrop {background:#070e1cc7;backdrop-filter:blur(6px);}
.howto-head {display:flex;align-items:flex-start;justify-content:space-between;gap:16px;padding:24px 24px 0;}
.howto .eyebrow {color:#77e4df;font-size:14px;letter-spacing:.12em;margin:0 0 6px;}
.howto h2 {font-size:30px;line-height:1.2;margin:0;}
.howto-close {width:44px;height:44px;flex-shrink:0;background:transparent;color:#fff;border:1px solid #8b99ab;font-size:28px;}
.howto-close:hover {background:#30415d;}
.howto-body {padding:8px 24px;}.howto-body p {font-size:18px;line-height:1.6;color:#e2e8f0;margin:16px 0;}
.howto-foot {padding:8px 24px 24px;}
.howto :focus-visible {outline-color:#00c2cb;}
.howto h2:focus {outline:0;}
.home-view #load-note {position:relative;max-width:740px;margin:24px auto;}
@media(min-width:960px) {
 .stage-inner {grid-template-columns:minmax(0,1fr) minmax(0,460px);column-gap:56px;row-gap:28px;align-items:center;}
 .intro-copy {grid-column:1;grid-row:1;align-self:end;}
 .intro-start {grid-column:1;grid-row:2;align-self:start;}
 .intro-preview {grid-column:2;grid-row:1/3;}
 .also-try {grid-column:1/-1;grid-row:3;}
}
@media(max-width:959px) {.intro-preview {max-width:360px;}#intro-board {aspect-ratio:5/4;}#intro-board svg {height:100%;object-fit:contain;}.stage-intro {padding-top:100px;}}
@media(max-width:400px) {.intro-cta {align-items:stretch;}.start-button {padding:14px 18px;}.howto-head,.howto-body {padding-left:18px;padding-right:18px;}}

.utilities .mode-toggle b {position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;}
.stage-intro .back-link {display:flex;width:max-content;}