:root{
  --bg:#F1F4F6;--surface:#FFFFFF;--panel:#E3EAEE;--line:#C9D5DC;--line-strong:#9DB6C5;
  --ink:#182026;--ink-2:#44525C;--ink-3:#56646E;
  --accent:#456A80;--accent-hover:#365668;--accent-soft:#DCE7EE;--on-accent:#FFFFFF;
  --panel-bg:rgba(241,244,246,.88);
  --glass:rgba(255,255,255,.16);--glass-hover:rgba(255,255,255,.26);--glass-line:rgba(255,255,255,.3);--glass-solid:#ffffff;
  --hi:#A9CDE2; /* highlight used on top of the scene (always light on dark) */
  --font:"Inter","Noto Sans JP",system-ui,-apple-system,"Hiragino Sans","Yu Gothic UI",sans-serif;
  --ease:cubic-bezier(.2,.8,.2,1);
  color-scheme:light;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#12171A;--surface:#1A2125;--panel:#1F2D35;--line:#283238;--line-strong:#47687A;
    --ink:#E3EAEE;--ink-2:#B5C3CC;--ink-3:#8FA0AA;
    --accent:#9FC3D8;--accent-hover:#BBD6E5;--accent-soft:#1F2D35;--on-accent:#101517;
    --panel-bg:rgba(18,23,26,.86);
    --glass:rgba(8,14,18,.34);--glass-hover:rgba(8,14,18,.5);--glass-line:rgba(255,255,255,.18);color-scheme:dark;
  }
}
:root[data-theme="dark"]{
  --bg:#12171A;--surface:#1A2125;--panel:#1F2D35;--line:#283238;--line-strong:#47687A;
  --ink:#E3EAEE;--ink-2:#B5C3CC;--ink-3:#8FA0AA;
  --accent:#9FC3D8;--accent-hover:#BBD6E5;--accent-soft:#1F2D35;--on-accent:#101517;
  --panel-bg:rgba(18,23,26,.86);
  --glass:rgba(8,14,18,.34);--glass-hover:rgba(8,14,18,.5);--glass-line:rgba(255,255,255,.18);color-scheme:dark;
}

*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:#1b2d3a;color:#fff;font:400 14px/1.6 var(--font);-webkit-font-smoothing:antialiased;overflow:hidden}
button,input{font:inherit;color:inherit}
:focus-visible{outline:2px solid var(--hi);outline-offset:2px}
[hidden]{display:none!important}
.sprite{position:absolute;width:0;height:0;overflow:hidden}
.ic{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0}

/* scene */
#bg,#glass{position:fixed;inset:0;width:100%;height:100%;display:block}
#glass{pointer-events:none}
#bg,#glass{will-change:transform}
.shade{position:fixed;inset:0;pointer-events:none;background:linear-gradient(to bottom,rgba(8,14,20,.38),rgba(8,14,20,0) 22%,rgba(8,14,20,0) 55%,rgba(8,14,20,.5))}

/* hide UI: everything marked .hider fades out */
.hider{transition:opacity .5s linear}
body.ui-hidden .hider{opacity:0;pointer-events:none}
body.ui-hidden #hide-btn{opacity:.55}
body.ui-hidden #hide-btn:hover{opacity:1}

/* top bar */
.top{position:fixed;top:0;left:0;right:0;display:flex;justify-content:space-between;align-items:flex-start;gap:12px;padding:16px 20px;z-index:5}
.logo{display:inline-flex;align-items:center;gap:.45em;font:500 20px/1 Inter,sans-serif;letter-spacing:.07em;color:#fff;text-decoration:none;text-shadow:0 1px 8px rgba(0,0,0,.35)}
.logo svg{width:1.25em;height:1.25em;--accent:var(--hi)}
.tools{display:flex;flex-wrap:wrap;gap:8px;justify-content:flex-end}
.tgroup{display:flex;gap:6px}
.gbtn{height:36px;padding:0 14px;border-radius:999px;border:1px solid var(--glass-line);background:var(--glass);color:#fff;cursor:pointer;display:inline-flex;align-items:center;gap:7px;font-size:13px;white-space:nowrap;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);text-shadow:0 1px 4px rgba(0,0,0,.25);transition:background .15s var(--ease),opacity .2s}
.gbtn:hover:not(:disabled){background:var(--glass-hover)}
.gbtn:disabled{opacity:.45;cursor:default}
.gbtn.wide{width:100%;justify-content:center;margin-top:8px}
.gbtn[aria-pressed="true"],.gbtn[aria-expanded="true"]{background:var(--glass-hover);border-color:var(--hi)}
.gbtn.on{border-color:var(--hi)}

/* start overlay (browsers need a click before audio) */
.center{position:fixed;inset:0;display:grid;place-items:center;pointer-events:none;z-index:4}
.start{pointer-events:auto;display:flex;flex-direction:column;align-items:center;gap:6px;padding:26px 40px;border-radius:26px;border:1px solid var(--glass-line);background:var(--glass);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);color:#fff;cursor:pointer;text-shadow:0 1px 6px rgba(0,0,0,.3);transition:transform .2s var(--ease),background .15s}
.start:hover{background:var(--glass-hover);transform:scale(1.02)}
.start .ic{width:34px;height:34px;fill:currentColor;stroke:none}
.start b{font-size:18px;font-weight:600;letter-spacing:.08em}
.start span{font-size:12px;opacity:.85}

/* dock: sound layers + volume */
.dock{position:fixed;left:0;right:0;bottom:0;display:flex;flex-direction:column;align-items:center;gap:14px;padding:0 16px calc(58px + env(safe-area-inset-bottom));z-index:5}
.pills{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.pill{width:66px;height:92px;border-radius:33px;border:1px solid var(--glass-line);background:var(--glass);color:#fff;cursor:pointer;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;font-size:11px;line-height:1.25;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);text-shadow:0 1px 4px rgba(0,0,0,.3);transition:background .15s var(--ease),transform .15s var(--ease),border-color .15s;padding:0 4px}
.pill:hover{background:var(--glass-hover)}
.pill .ic{width:26px;height:26px;stroke-width:1.5}
.pill[aria-pressed="true"]{background:rgba(255,255,255,.28);border-color:var(--hi);box-shadow:0 0 0 1px var(--hi) inset}
.pill i{display:block;width:30px;height:3px;border-radius:2px;background:rgba(255,255,255,.28);position:relative;overflow:hidden}
.pill i b{position:absolute;left:0;top:0;bottom:0;background:var(--hi);border-radius:2px}
.vol{display:flex;align-items:center;gap:10px;width:min(360px,100%);color:#fff;text-shadow:0 1px 4px rgba(0,0,0,.3)}
.play{width:42px;height:42px;border-radius:50%;border:1px solid var(--glass-line);background:var(--glass);color:#fff;cursor:pointer;display:grid;place-items:center;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);flex-shrink:0}
.play:hover{background:var(--glass-hover)}
.play[aria-pressed="true"]{border-color:var(--hi)}
.vol output{width:2.6ch;text-align:right;font-variant-numeric:tabular-nums;font-size:12px;opacity:.9}
input[type="range"]{-webkit-appearance:none;appearance:none;flex:1;height:22px;background:transparent;cursor:pointer;margin:0}
input[type="range"]::-webkit-slider-runnable-track{height:3px;border-radius:2px;background:rgba(255,255,255,.4)}
input[type="range"]::-moz-range-track{height:3px;border-radius:2px;background:rgba(255,255,255,.4)}
input[type="range"]::-webkit-slider-thumb{-webkit-appearance:none;width:16px;height:16px;border-radius:50%;background:#fff;margin-top:-6.5px;box-shadow:0 1px 4px rgba(0,0,0,.35)}
input[type="range"]::-moz-range-thumb{width:16px;height:16px;border:0;border-radius:50%;background:#fff;box-shadow:0 1px 4px rgba(0,0,0,.35)}

/* popups (timer, mixer) */
.pop{position:fixed;right:20px;top:64px;width:min(330px,calc(100vw - 32px));max-height:calc(100dvh - 150px);overflow:auto;background:var(--panel-bg);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);color:var(--ink);border:1px solid var(--line);border-radius:18px;padding:14px 16px 16px;z-index:8;box-shadow:0 12px 40px rgba(0,0,0,.3)}
.pop-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:6px}
.pop-head b{font-size:15px}
.pop h2{margin:14px 0 6px;font-size:12px;font-weight:600;color:var(--ink-3);letter-spacing:.04em}
.pop-note{margin:0 0 10px;font-size:12.5px;color:var(--ink-3)}
.x{width:28px;height:28px;border-radius:8px;border:0;background:transparent;color:var(--ink-3);cursor:pointer;display:grid;place-items:center}
.x:hover{background:var(--accent-soft);color:var(--ink)}
.pop .gbtn{background:transparent;color:var(--ink);border-color:var(--line-strong);text-shadow:none;backdrop-filter:none;-webkit-backdrop-filter:none}
.pop .gbtn:hover:not(:disabled){background:var(--accent-soft)}
.chips{display:flex;flex-wrap:wrap;gap:6px}
.chip{height:32px;padding:0 13px;border-radius:999px;border:1px solid var(--line-strong);background:transparent;color:var(--ink);cursor:pointer;font-size:13px}
.chip:hover{background:var(--accent-soft)}
.chip[aria-pressed="true"]{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
.row{display:flex;align-items:center;gap:10px;font-size:13px;color:var(--ink-2)}
.row span{width:5.5em;flex-shrink:0}
.pop input[type="range"]::-webkit-slider-runnable-track{background:var(--line-strong)}
.pop input[type="range"]::-moz-range-track{background:var(--line-strong)}
.pop input[type="range"]::-webkit-slider-thumb{background:var(--accent);box-shadow:none}
.pop input[type="range"]::-moz-range-thumb{background:var(--accent);box-shadow:none}
.scenes{display:grid;grid-template-columns:repeat(3,1fr);gap:6px}
.chk{display:flex;align-items:flex-start;gap:8px;margin:10px 0 0;font-size:12.5px;line-height:1.5;color:var(--ink-2);cursor:pointer}
.chk input{accent-color:var(--accent);width:16px;height:16px;margin:1px 0 0;flex-shrink:0}
.scene{aspect-ratio:16/10;border-radius:8px;border:2px solid transparent;padding:0;cursor:pointer;overflow:hidden;background:var(--panel);position:relative}
.scene canvas{width:100%;height:100%;display:block}
.scene[aria-pressed="true"]{border-color:var(--accent)}
.scene span{position:absolute;left:0;right:0;bottom:0;font-size:9.5px;line-height:1.3;color:#fff;background:linear-gradient(transparent,rgba(0,0,0,.6));padding:8px 3px 2px;text-align:center}

/* toast */
.toast{position:fixed;left:50%;bottom:calc(20px + env(safe-area-inset-bottom));transform:translateX(-50%);background:rgba(10,16,20,.8);color:#fff;padding:8px 18px;border-radius:999px;font-size:13px;z-index:30;max-width:calc(100vw - 32px);backdrop-filter:blur(6px)}

/* Tsuzura footer: same shared block as the sister sites, laid out as a small link at the bottom of the scene */
.tz-foot{position:fixed;left:0;right:0;bottom:0;display:flex;justify-content:center;padding:0 16px calc(12px + env(safe-area-inset-bottom));z-index:5;pointer-events:none}
.tz-link{pointer-events:auto;display:inline-flex;align-items:center;gap:10px;padding:5px 16px 5px 8px;border:1px solid var(--glass-line);border-radius:999px;background:var(--glass);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);color:#fff;text-decoration:none;font-size:11px;line-height:1.4;--tz-gap:rgba(40,52,60,.85);transition:background .15s;text-shadow:0 1px 4px rgba(0,0,0,.3)}
.tz-link:hover{background:var(--glass-hover)}
.tz-mark{width:20px;height:20px;color:#E3C48E;flex-shrink:0}
.tz-name{font-size:12px;font-weight:500;letter-spacing:.12em}
.tz-sub{opacity:.85}
body.ui-hidden .tz-foot{opacity:0;pointer-events:none}
.tz-foot{transition:opacity .5s linear}

@media (max-width:700px){
  .top{padding:12px 12px;flex-wrap:wrap}
  .tools{gap:6px}
  .gbtn span{display:none}
  .gbtn{padding:0 11px}
  #timer-label{display:inline}
  .pill{width:58px;height:82px}
  .pop{right:12px;left:12px;width:auto;top:60px}
  .tz-sub{display:none}
  .dock{padding-bottom:calc(52px + env(safe-area-inset-bottom))}
}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{transition:none!important}}