/* Layout: the complete board uses one 680 × 280 coordinate system. */
:root{color-scheme:dark;font-family:Arial,"Yu Gothic",sans-serif;background:#08090b;color:#f0f1f4}
*{box-sizing:border-box}
html,body,body *{cursor:default!important}
body{margin:0}
main{width:100%;max-width:900px;min-height:100svh;display:flex;flex-direction:column;margin:auto;padding:24px 24px 28px}
header{position:relative;display:flex;align-items:center;min-height:56px;margin-bottom:20px}
h1{font-size:32px;font-weight:400;margin:0}
.rules{font-size:14px;line-height:1.9;color:#bbc0ca}
.rules p{margin:6px 0}
button{font:inherit;color:inherit;border:1px solid #565d69;background:#171a20;padding:10px 16px;min-height:44px;border-radius:2px}
button:focus-visible,.char:focus-visible{outline:2px solid #d7e3f6;outline-offset:3px}
.char{display:inline-block;touch-action:none;-webkit-user-select:none;user-select:none;-webkit-touch-callout:none}
.composite{display:inline-block;position:relative}
.composite .bottom{position:absolute;inset:32% 0 0;width:100%;font-size:inherit;line-height:inherit;text-align:center}
.composite .inner{position:absolute;inset:30% 25%;font-size:inherit}
.board{width:100%;max-width:680px;aspect-ratio:17 / 7;flex:none;align-self:center;margin:32px auto 0;padding:0}
#scene{display:block;width:100%;height:100%;overflow:visible}
.origin{width:100px;height:60px;display:flex;align-items:center;gap:4px;font-size:30px;line-height:1}
.origin>.char{width:36px;text-align:center}
#slot{display:grid;place-items:center;width:60px;height:60px;min-height:60px;flex:0 0 60px;padding:0;border:1px dashed #626976;background:#111419;font-size:30px;line-height:1;aspect-ratio:1}
#slot.over{outline:2px solid #c8d3e4;background:#252b35}
#slot.filled{border-style:solid}
#slot.enclosed{border:3px solid currentColor;border-radius:0}
#stage-progress{display:flex;justify-content:center;align-items:center;width:156px;height:28px;gap:16px}
#stage-progress span{position:relative;display:block;flex:0 0 24px;width:24px;height:24px;border:1px solid #626b78;border-radius:50%;background:#08090b;transition:background-color .3s,border-color .3s}
#stage-progress span+span::before{content:'';position:absolute;right:calc(100% + 4px);top:10px;width:10px;height:1px;background:#4d5561}
#stage-progress span.current{border:2px solid #f1f4f8;box-shadow:inset 0 0 0 4px #08090b;background:#8a95a4}
#stage-progress span.done{background:#f1f4f8;border-color:#f1f4f8}
#stage-progress span.done::after{content:'';position:absolute;left:7px;top:4px;width:6px;height:10px;border-right:2px solid #15191f;border-bottom:2px solid #15191f;transform:rotate(40deg)}
#line-path{fill:none;stroke:var(--beam-color,#eee);stroke-width:3;stroke-linecap:round;pointer-events:none}
#line-path.luminous{filter:drop-shadow(0 0 3px var(--beam-color)) drop-shadow(0 0 7px var(--beam-color))}
#impact{fill:none;stroke:var(--beam-color);filter:drop-shadow(0 0 6px var(--beam-color));pointer-events:none}
#radio-waves{pointer-events:none}
#radio-waves circle{fill:none;stroke:#77f5bb;stroke-width:3;opacity:0;filter:drop-shadow(0 0 5px #77f5bb)}
#radio-waves.radiating circle{animation:radio-spread 1.35s ease-out both}
#radio-waves.radiating circle:nth-child(2){animation-delay:.2s}
#radio-waves.radiating circle:nth-child(3){animation-delay:.4s}
@keyframes radio-spread{from{opacity:.85;r:9px}to{opacity:0;r:240px}}
#scene.raining{background-image:repeating-linear-gradient(110deg,transparent 0,transparent 22px,#739dc733 23px,transparent 24px);background-size:45px 55px;animation:rain .6s linear infinite}
@keyframes rain{to{background-position:-20px 55px}}
.below{width:100%;max-width:680px;min-height:32px;flex:none;align-self:center;margin:12px auto 0}
#status{display:block;min-height:24px;text-align:center;font-size:14px}
/* CSS Stock: underlined accordion and pagination, adapted for this puzzle. */
#memo-region{width:100%;max-width:680px;min-height:198px;flex:none;margin:4px auto 0}
#memo-tab{position:relative;min-height:43px;margin:0;padding:7px 25px 7px 4px;border:0;border-bottom:1px solid #75808f;border-radius:0;background:transparent;font-size:15px;letter-spacing:.08em}
#memo-tab::after{content:'⌄';position:absolute;margin-left:9px;font-size:17px}
#memo{width:100%;margin:0;padding:0;background:transparent}
.memo-head{display:flex;align-items:center;justify-content:flex-end;height:43px;padding:0 4px;border-bottom:1px solid #75808f}
#memo-close{display:grid;place-items:center;width:35px;height:35px;min-height:35px;padding:0;border:0;background:none;font-size:24px}
#memo-content{height:110px;min-height:110px;display:grid;place-items:center;padding:18px 8px;font-size:23px}
#memo-content p{margin:0;text-align:center}
#diary-pages{display:flex;justify-content:center;align-items:center;gap:22px;padding:0 2px 4px}
#diary-pages button{min-width:58px;min-height:36px;padding:5px 2px;border:0;border-bottom:1px solid #77818e;border-radius:0;background:transparent;font-size:13px}
#diary-pages button:disabled{opacity:.28}
#page-count{min-width:62px;text-align:center;color:#e5eaf0;font-size:15px;letter-spacing:.04em}
footer{margin-top:auto;padding-top:20px;text-align:center}
#restart{background:none;border:0;color:#bbc0ca;font-size:12px}
#network{position:absolute;right:4px;top:0;display:flex;align-items:flex-end;gap:3px;height:18px}
#network i{display:block;width:4px;background:#333a42;height:5px}
#network i:nth-of-type(2){height:9px}#network i:nth-of-type(3){height:13px}#network i:nth-of-type(4){height:17px}
#network.connected i{background:#77f5bb;box-shadow:0 0 7px #77f5bb}
#notification{position:fixed;z-index:20;top:14px;left:50%;width:min(440px,calc(100% - 32px));margin:0;transform:translateX(-50%);display:flex;gap:13px;align-items:center;padding:12px 15px;border:1px solid #597268;border-radius:16px;background:#202b29ef;box-shadow:0 12px 35px #0009,0 0 1px #77f5bb;backdrop-filter:blur(12px);font-size:14px}
#notification.arriving{animation:notification-in .55s cubic-bezier(.2,.8,.2,1) both}
@keyframes notification-in{from{opacity:0;transform:translate(-50%,-120%)}to{opacity:1;transform:translate(-50%,0)}}
.notification-icon{display:grid;place-items:center;flex:none;width:37px;height:37px;border:2px solid #77f5bb;border-radius:10px;background:transparent;color:#77f5bb;box-shadow:0 0 8px #77f5bb99,inset 0 0 7px #77f5bb55;font-family:Arial,sans-serif;font-size:9px;font-weight:800;letter-spacing:-.03em}
.notification-copy{min-width:0}.notification-copy strong{display:block;margin-bottom:3px;font-size:11px;font-weight:600;color:#bcd6c8}.notification-copy p{margin:0;line-height:1.5}
.drag-ghost{position:fixed;pointer-events:none;z-index:100;font-size:26px;transform:translate(-50%,-50%);color:#fff;background:#202631;border:1px solid #8894a8;padding:4px 9px}
#clear-dialog{width:min(420px,calc(100% - 32px));max-height:calc(100svh - 32px);overflow:auto;padding:34px 32px 24px;border:1px solid #434b58;border-radius:12px;background:#171b22;color:#f0f1f4;box-shadow:0 18px 60px #000a;text-align:center}
#clear-dialog::backdrop{background:#000b}
#clear-dialog h2{margin:8px 0 28px;font-size:26px;font-weight:400}
#clear-share{display:block;min-width:150px;margin:0 auto 14px;border-radius:7px;background:#293a35;border-color:#6da387}
#back{display:block;min-height:36px;margin:0 auto;border:0;border-bottom:1px solid #68717d;background:none;font-size:14px}
.clear-links{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-top:25px;padding-top:19px;border-top:1px solid #3d4651}
.clear-links a{color:#c8d0dc;font-size:12px;text-decoration:none}.clear-links a:hover{text-decoration:underline}
[hidden]{display:none!important}
@media(max-width:550px){main{padding:24px 16px 24px}h1{font-size:30px}.rules{font-size:13px}.board{margin-top:36px}}
@media(prefers-reduced-motion:reduce){#radio-waves.radiating circle,#notification.arriving{animation-duration:.01ms}}

#status,#memo-content p{white-space:pre-line}

/* Stage 4: subtly stretch the memo close glyph. */
#memo-close[data-char="X"]{font-size:0}
#memo-close[data-char="X"]::before{content:"\00d7";font-family:Arial,sans-serif;font-size:24px;line-height:1;transform:scale(.9,1.35);pointer-events:none}

.rules-heading{margin:0 0 8px;font-size:15px;line-height:1.5;font-weight:600;color:#f0f1f4}

#clear-return{display:block;margin:0 auto;background:none;border:0;color:#bbc0ca;font-size:12px}