/* Stack Up engine visuals. Outer layout comes from the shared game-shell.css. */
.sort-area { position: relative; padding: 28px 4px 15px; border-top: 2px solid var(--line); border-bottom: 2px solid var(--line); }
.sort-line { position: absolute; display: flex; align-items: center; gap: 9px; top: 8px; left: 5px; right: 5px; color: var(--ink-soft); font-family: ui-monospace, monospace; font-size: 9px; font-weight: 900; letter-spacing: .7px; }
.sort-line i { flex: 1; height: 2px; background: repeating-linear-gradient(90deg, var(--line) 0 5px, transparent 5px 9px); }
.cards { display: grid; grid-template-columns: repeat(5, 1fr); gap: 10px; min-height: 133px; }
.sort-card { display: flex; min-width: 0; min-height: 121px; flex-direction: column; justify-content: space-between; position: relative; padding: 13px 11px 11px; border: 2px solid var(--ink); background: var(--white); box-shadow: 3px 3px 0 var(--ink); transition: transform .15s ease, background .15s ease, box-shadow .15s ease; user-select: none; clip-path: polygon(0 5px, 5px 5px, 5px 0, calc(100% - 5px) 0, calc(100% - 5px) 5px, 100% 5px, 100% calc(100% - 5px), calc(100% - 5px) calc(100% - 5px), calc(100% - 5px) 100%, 5px 100%, 5px calc(100% - 5px), 0 calc(100% - 5px)); }
.sort-card:hover { transform: translate(-2px, -2px); box-shadow: 5px 5px 0 var(--ink); }
.sort-card.dragging { opacity: .4; transform: scale(.95); }
.sort-card.drag-over { background: #e3f2ed; transform: translateX(3px); }
.card-number { color: var(--ink-soft); font-family: ui-monospace, monospace; font-size: 10px; font-weight: 800; }
.card-symbol { display: grid; place-items: center; width: 34px; height: 34px; border: 1.5px solid var(--ink); background: var(--blue); color: var(--ink); font-family: ui-monospace, monospace; font-size: 18px; font-weight: 900; }
.card-symbol.alt-1 { background: #f6c671; }.card-symbol.alt-2 { background: #b8d957; }.card-symbol.alt-3 { background: #d8c6e7; }.card-symbol.alt-4 { background: #f1a99e; }
.card-name { font-size: 13px; font-weight: 900; line-height: 1.08; overflow-wrap: anywhere; }
.card-detail { margin-top: 3px; color: var(--ink-soft); font-size: 10px; line-height: 1.15; }

.board-actions { display: flex; align-items: center; justify-content: space-between; gap: 20px; padding-top: 20px; }
.message { margin-bottom: 0; color: var(--ink-soft); font-size: 12px; font-weight: 700; }
.message.bad { color: var(--coral); }.message.good { color: var(--green); }
.check-button, .next-button { border: 2px solid var(--ink); background: var(--lime); color: var(--ink); padding: 12px 15px; box-shadow: 3px 3px 0 var(--ink); font-family: ui-monospace, monospace; font-size: 12px; font-weight: 900; letter-spacing: .2px; transition: transform .1s, box-shadow .1s, background .2s; }
.check-button:hover, .next-button:hover { transform: translate(-2px, -2px); box-shadow: 5px 5px 0 var(--ink); }
.check-button:active, .next-button:active { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--ink); }
.check-button span, .next-button span { margin-left: 7px; }

.result-modal { position: fixed; z-index: 10; display: grid; place-items: center; inset: 0; padding: 20px; background: rgba(23, 38, 58, .65); opacity: 0; pointer-events: none; transition: opacity .2s ease; }
.result-modal.open { opacity: 1; pointer-events: all; }
.result-card { position: relative; width: min(100%, 410px); padding: 37px 31px 27px; border: 2px solid var(--ink); background: var(--white); box-shadow: 8px 8px 0 var(--ink); text-align: center; transform: translateY(12px) scale(.96); transition: transform .2s ease; }
.result-modal.open .result-card { transform: translateY(0) scale(1); }
.result-burst { display: inline-grid; place-items: center; width: 42px; height: 42px; border: 2px solid var(--ink); background: var(--lime); font-size: 26px; }
#result-kicker { margin: 16px 0 6px; color: var(--coral); font-family: ui-monospace, monospace; font-size: 10px; font-weight: 900; letter-spacing: 1px; }
.result-card h2 { margin-bottom: 4px; font-size: 28px; letter-spacing: -1.3px; }
#result-detail { margin-bottom: 19px; color: var(--green); font-family: ui-monospace, monospace; font-size: 16px; font-weight: 900; }
.fact-box { padding: 12px 13px; border: 1.5px solid var(--ink); background: #e8f2f0; text-align: left; }
.fact-box span { color: var(--blue-deep); font-family: ui-monospace, monospace; font-size: 10px; font-weight: 900; letter-spacing: .6px; }
.fact-box p { margin: 6px 0 0; font-size: 12px; line-height: 1.35; }
.next-button { margin-top: 20px; }


[hidden]{display:none!important}
.stack-engine{--line:#bed0cd;padding:24px 28px;background:var(--white)}
.stack-engine p{color:var(--ink-soft)}
.stack-engine h2{font-family:Arial,Helvetica,sans-serif;letter-spacing:-.7px;line-height:1.2;margin:0 0 10px}
.br-game-title-group h1{white-space:normal}
.br-game-shell .quick-stat strong.compact-score{font-size:clamp(10px,1.1vw,18px);letter-spacing:-.5px}
.br-game-progress{flex-direction:column;gap:8px;min-height:27px;margin-bottom:14px}
#round-label{font:700 9px/1.4 ui-monospace,monospace;letter-spacing:.6px}
.round-dots{display:flex;gap:5px;justify-content:center;margin:0}
.round-dots i{display:block;width:9px;height:9px;border:1.5px solid var(--ink)}
.round-dots i.done{background:var(--lime)}.round-dots i.current{background:var(--coral)}
.intro-screen{text-align:center;padding:8px 0}
.intro-kicker{display:flex;align-items:center;justify-content:center;gap:8px;font:800 9px/1.5 ui-monospace,monospace;letter-spacing:.6px;margin:0 0 20px}
.intro-kicker span{width:10px;height:10px;border:2px solid var(--ink);background:var(--coral);box-shadow:2px 2px var(--ink)}
#intro-title{font:900 clamp(30px,4vw,44px)/1.05 'Courier New',monospace;letter-spacing:-2px;text-shadow:3px 3px var(--blue)!important}
#intro-title em{color:var(--coral);font-style:normal;text-shadow:3px 3px #f6cf9b}
.intro-lede{max-width:460px;font:14px/1.6 Arial,sans-serif;margin:20px auto 0}
.stack-sample{display:flex;justify-content:center;align-items:end;gap:8px;height:92px;margin:18px 0}
.stack-sample span{display:grid;place-items:center;width:52px;height:54px;border:2px solid var(--ink);box-shadow:3px 3px var(--ink);background:#e4f2f4;font:900 12px 'Courier New',monospace}
.stack-sample span:nth-child(2){height:60px;background:#f9e2a7}.stack-sample span:nth-child(3){height:66px;background:#d8ec91}.stack-sample span:nth-child(4){height:72px;background:#e1d1ec}.stack-sample span:nth-child(5){height:78px;background:#f6beb7}
.tutorial-steps{list-style:none;display:grid;gap:8px;padding:0;margin:24px auto;max-width:520px;counter-reset:steps;text-align:left}
.tutorial-steps li{counter-increment:steps;display:grid;grid-template-columns:36px 100px 1fr;align-items:center;border:1px solid var(--ink);background:var(--paper);font:12px/1.5 Arial,sans-serif}
.tutorial-steps li:before{content:counter(steps,decimal-leading-zero);display:grid;place-items:center;align-self:stretch;background:var(--blue);border-right:1px solid var(--ink);font:800 10px ui-monospace,monospace;padding:12px 0}
.tutorial-steps b{font:800 10px ui-monospace,monospace;padding:8px}.tutorial-steps li>span{padding:8px}
.start-actions{display:flex;justify-content:center;gap:12px;flex-wrap:wrap}
.play-button{border:2px solid var(--ink);padding:12px 15px;background:var(--lime);box-shadow:3px 3px var(--ink);font:900 12px/1.5 ui-monospace,monospace}
.secondary-play{background:var(--white)}.play-button strong{display:inline-block;font-size:10px;color:var(--coral);border:1px solid var(--ink);background:var(--paper);padding:0 3px;margin-left:4px}.play-button>span{color:var(--coral);margin-left:8px}
.start-note{font:11px/1.6 Arial,sans-serif;margin:18px 0 0}
.game-layout,.game-column{min-width:0}.game-board{min-width:0}.game-board h2{font-size:clamp(23px,2.8vw,30px)}
.stack-run-tools{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:0 0 24px}
#timer-card,.score-card{border:1px solid var(--ink);box-shadow:2px 2px var(--ink);padding:12px 14px;min-width:0;background:#e4f2f4}
.score-card{display:block;background:#edf2d3}.card-heading{display:flex;align-items:center;gap:8px;color:var(--ink-soft);font:900 9px/1.5 ui-monospace,monospace;letter-spacing:.7px}
.card-heading i{width:7px;height:7px;background:var(--coral)}
#timer-card .timer{font:900 32px/1.1 'Courier New',monospace;letter-spacing:-1px;margin:8px 0}.timer-track{height:7px;border:1.5px solid var(--ink);background:var(--paper-deep)}.timer-track span{display:block;height:100%;background:var(--blue-deep);transition:width .3s linear}
#timer-caption{font:10px/1.5 Arial,sans-serif;margin:8px 0 0}.run-score{display:block;font:900 30px/1.1 'Courier New',monospace;letter-spacing:-1px;margin:8px 0}
.score-card p{font:10px/1.5 Arial,sans-serif;margin:0}
.board-topline{display:flex;justify-content:space-between;align-items:center;gap:12px;margin:0 0 16px}
.category-tag{border:1.5px solid var(--ink);padding:5px 8px;background:#d6ebef;font:900 10px/1.5 ui-monospace,monospace;letter-spacing:.6px}
.streak-label{font:800 10px ui-monospace,monospace;color:var(--ink-soft)}.streak-label b{color:var(--coral)}
.instructions{font:13px/1.6 Arial,sans-serif;margin:0 0 22px}
.cards{min-height:180px}.sort-card{clip-path:none;padding:10px;gap:9px;min-height:180px;cursor:grab}.sort-card:active{cursor:grabbing}
.card-name{font:800 13px/1.35 Arial,sans-serif}.card-detail:empty{display:none}.card-moves{display:flex;gap:5px;margin-top:5px}
.card-moves button{flex:1;min-width:0;min-height:36px;border:1.5px solid var(--ink);background:var(--white);font:900 16px ui-monospace,monospace;box-shadow:1px 1px var(--ink)}
.card-moves button:disabled{opacity:.3}.sort-card:focus-visible,.sort-card:focus-within{outline:3px solid var(--coral);outline-offset:3px;background:#e4f2f4}
.board-actions{align-items:center}.message{min-width:0;flex:1;font:600 12px/1.6 Arial,sans-serif;overflow-wrap:anywhere}.check-button{flex-shrink:0;min-height:44px}.check-button:disabled{opacity:.65;transform:none}
.record-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:16px 0}.record-grid>div{background:var(--paper);border:1px solid var(--ink);padding:12px;min-width:0}.record-grid dt{font:800 10px/1.4 ui-monospace,monospace;color:var(--ink-soft)}.record-grid dd{margin:8px 0 0;font:900 23px/1.2 'Courier New',monospace;overflow-wrap:anywhere}
.local-note{font:11px/1.5 Arial,sans-serif;color:var(--ink-soft);margin:16px 0 0}.tiny-label{color:var(--coral);font:900 9px/1.5 ui-monospace,monospace;letter-spacing:1px}
.result-modal{opacity:1;pointer-events:auto;z-index:1100}.result-card{transform:none;max-height:calc(100dvh - 40px);overflow:auto}.result-card h2{font:800 28px/1.2 Arial,sans-serif}
.correct-order{font:12px/1.6 Arial,sans-serif;margin:14px 0;color:var(--ink-soft)}.result-card .next-button{min-height:44px}
.summary-actions{display:flex;gap:12px;flex-wrap:wrap;align-items:center}.text-link{text-decoration:underline;font-size:13px}#summary-score{font:800 42px/1.2 Arial,sans-serif;margin:16px 0}#summary-detail{font:14px/1.6 Arial,sans-serif}
#save-warning,#day-notice{border:2px solid var(--ink);background:var(--yellow);padding:12px;font:13px/1.6 Arial,sans-serif;margin:0 0 16px}
@media(max-width:650px){.stack-engine{padding:20px 16px}.stack-run-tools{gap:10px;margin-bottom:20px}#timer-caption{display:none}.stack-run-tools{position:sticky;top:8px;z-index:5;background:var(--white)}.cards{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.sort-card:last-child{grid-column:1/-1;min-height:140px}.sort-card{min-height:165px}.card-moves button{min-height:38px}.board-actions{flex-direction:column;align-items:stretch;gap:14px}.board-actions .check-button{width:100%}.tutorial-steps li{grid-template-columns:32px 1fr}.tutorial-steps li:before{grid-row:span 2}.tutorial-steps b{padding:7px 10px 0}.tutorial-steps li>span{padding:2px 10px 7px}.intro-kicker{font-size:8px}.start-actions{display:grid;grid-template-columns:1fr}.start-actions button{width:100%}.summary-actions{flex-direction:column;align-items:stretch}.next-button{width:100%}.record-grid dd{font-size:22px}.stack-sample{gap:6px}.stack-sample span{width:38px}}
@media(prefers-reduced-motion:reduce){.sort-card,.timer-track span,.check-button,.next-button,.result-modal,.result-card{transition:none;animation:none}}

#eyebrow{margin:0 0 14px;font:800 9px/1.5 ui-monospace,monospace;letter-spacing:.7px}#eyebrow span{margin-left:6px;color:var(--coral)}

#timer-card.warning{border-color:var(--coral)}#timer-card.warning .timer{color:var(--coral)}#timer-card.warning .timer-track span{background:var(--coral)}#timer-card.urgent{background:#fff1e9}

/* Brief positional feedback after an incorrect submission; also visible on focused cards. */
#cards .sort-card.correct{border-color:#3a7850;background:#d8ec91}
#cards .sort-card.wrong{border-color:#b23b32;background:#f9d5cc}
#cards .sort-card.correct .card-number{color:#285b38}
#cards .sort-card.wrong .card-number{color:#8c2c26}

/* JS animates grid reordering from the previous displayed bounds, including row wraps. */
.sort-card.reordering{transform:none;transition:none;will-change:transform;z-index:2}
.sort-card.reordering:focus{z-index:3}

/* Mouse dragging uses a pointer-tracked card; the grid keeps a faint landing slot. */
.stack-drag-layer{position:fixed;inset:0;z-index:1000;overflow:hidden;pointer-events:none}
.sort-card.drag-proxy{position:absolute;left:0;top:0;margin:0;transform-origin:top left;transition:none;pointer-events:none;box-shadow:7px 7px 0 var(--ink);will-change:transform}
.sort-card.drag-placeholder{opacity:.16;border-style:dashed;outline:none}
.stack-mouse-dragging,.stack-mouse-dragging *{cursor:grabbing!important}