:root{
  --bg:#dfe6ef; --ink:#161b22; --dim:#5d6a7c; --line:#a8b6c8;
  --panel:rgba(255,255,255,.9); --accent:#161b22;
  --mono:"SFMono-Regular",ui-monospace,Menlo,Consolas,monospace;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#0b0d11; --ink:#e9eef6; --dim:#8794a8; --line:#262f3c;
    --panel:rgba(14,18,24,.9); --accent:#e9eef6;
  }
}
:root[data-theme="dark"]{
  --bg:#0b0d11; --ink:#e9eef6; --dim:#8794a8; --line:#262f3c;
  --panel:rgba(14,18,24,.9); --accent:#e9eef6;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;height:100%;overflow:hidden;background:var(--bg);color:var(--ink);
  font-family:var(--mono);font-size:13px;overscroll-behavior:none;
  transition:background .45s ease,color .45s ease}
#c{position:fixed;inset:0;width:100%;height:100%;display:block;touch-action:none}

/* 左上 */
#hud{position:fixed;top:max(14px,env(safe-area-inset-top));left:16px;pointer-events:none;z-index:4}
#hud h1{font:400 clamp(16px,2.6vw,22px)/1 var(--mono);margin:0 0 6px;letter-spacing:-.02em}
#hud pre{margin:0;font:400 10px/1.6 var(--mono);color:var(--dim);white-space:pre;letter-spacing:.04em}
#link{margin-top:8px;font:400 10px/1.5 var(--mono);color:var(--ink);letter-spacing:.06em;
  max-width:46vw;opacity:0;transform:translateY(-3px);transition:opacity .7s,transform .7s}
#link.on{opacity:.75;transform:none}
#link::before{content:"— "}

/* 月の目盛り (3D から投影) */
#months{position:fixed;inset:0;pointer-events:none;z-index:2}
#months b{position:absolute;font:400 11px/1 var(--mono);color:var(--dim);letter-spacing:.18em;
  transform:translate(-50%,-50%);opacity:0;transition:opacity .35s;white-space:nowrap}
#months.off b{opacity:0 !important}

/* 右上 */
#top{position:fixed;top:max(14px,env(safe-area-inset-top));right:14px;display:flex;gap:6px;z-index:6}
#q{width:min(42vw,220px);font:400 12px var(--mono);padding:9px 13px;border-radius:999px;
  border:1px solid var(--line);background:var(--panel);color:var(--ink);outline:none;
  -webkit-appearance:none;transition:border-color .2s}
#q:focus{border-color:var(--ink)}
.ico{width:36px;height:36px;flex:0 0 36px;border:1px solid var(--line);border-radius:999px;
  background:var(--panel);color:var(--dim);cursor:pointer;display:grid;place-items:center;padding:0;
  font:400 11px/1 var(--mono);letter-spacing:.06em;transition:color .2s,border-color .2s}
.ico[aria-pressed="false"]{opacity:.45}
#mths[aria-pressed="true"],#snd[aria-pressed="true"]{color:var(--ink);border-color:var(--ink)}
/* 音: 小さい三角 + 2 本の弧 */
#snd::before{content:"";width:13px;height:13px;
  background:currentColor;clip-path:polygon(0 36%,32% 36%,62% 8%,62% 92%,32% 64%,0 64%)}
#snd[aria-pressed="false"]::before{clip-path:polygon(0 36%,32% 36%,62% 8%,62% 92%,32% 64%,0 64%);opacity:.6}
#snd::after{content:"";position:absolute;width:13px;height:13px;
  border-right:1.5px solid currentColor;border-top:1.5px solid currentColor;border-radius:0 9px 0 0;
  transform:translateX(5px) scale(.62);opacity:0;transition:opacity .25s}
#snd[aria-pressed="true"]::after{opacity:1;animation:ring 2.4s ease-in-out infinite}
@keyframes ring{0%,100%{opacity:.35}50%{opacity:1}}
#theme{position:relative}
#snd{position:relative}
#theme::before{content:"";width:13px;height:13px;border-radius:50%;
  background:linear-gradient(90deg,var(--ink) 0 50%,transparent 50% 100%);
  box-shadow:inset 0 0 0 1px var(--ink);transition:transform .45s ease}
:root[data-theme="dark"] #theme::before{transform:rotate(180deg)}

#hits{position:fixed;top:calc(max(14px,env(safe-area-inset-top)) + 46px);right:14px;z-index:6;
  width:min(42vw,220px);max-height:44vh;overflow:auto;background:var(--panel);
  backdrop-filter:blur(12px);border:1px solid var(--line);border-radius:12px;display:none}
#hits.on{display:block}
#hits div{padding:8px 11px;border-bottom:1px solid var(--line);cursor:pointer;font-size:11px;line-height:1.4}
#hits div:last-child{border-bottom:0}
#hits b{display:block;font-weight:500}
#hits span{color:var(--dim)}

/* 詳細 */
#sheet{position:fixed;z-index:10;background:var(--panel);backdrop-filter:blur(18px);
  border:1px solid var(--line);overflow:auto;
  animation:sheetIn .42s cubic-bezier(.17,.84,.44,1) both}
#sheet[hidden]{display:none}
@media (min-width:721px){
  #sheet{top:50%;right:40px;transform:translateY(-50%);width:min(380px,40vw);border-radius:18px;padding:22px}
  @keyframes sheetIn{from{opacity:0;transform:translate(26px,-50%)}to{opacity:1;transform:translate(0,-50%)}}
  #cover{width:150px;margin:0 0 16px}
}
@media (max-width:720px){
  #sheet{left:0;right:0;bottom:0;max-height:84vh;border-radius:20px 20px 0 0;
    padding:18px 16px calc(18px + env(safe-area-inset-bottom))}
  @keyframes sheetIn{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:none}}
  #cover{width:116px;margin:0 0 14px}
}
#close{position:absolute;top:8px;right:10px;border:0;background:none;color:var(--dim);
  font-size:26px;line-height:1;cursor:pointer;padding:4px 8px}
#play{display:block;margin:0 0 12px;font:400 11px/1 var(--mono);letter-spacing:.08em;
  padding:10px 16px;border:1px solid var(--ink);border-radius:999px;background:var(--accent);
  color:var(--bg);cursor:pointer;position:relative}
#play[hidden]{display:none}
#play em{display:inline-block;width:0;height:0;margin-left:8px;vertical-align:1px;
  border-left:6px solid currentColor;border-top:4px solid transparent;border-bottom:4px solid transparent}
#play[aria-pressed="true"] em{width:7px;height:7px;border:0;background:currentColor;vertical-align:-1px}
#play.flat{background:none;color:var(--dim);border-color:var(--line);cursor:default}
#play.flat em{display:none}
#bar{position:absolute;left:0;right:0;bottom:0;height:3px;background:var(--ink);
  transform:scaleX(0);transform-origin:0 50%;transition:transform .2s linear;border-radius:0 0 6px 6px}
#cover{position:relative;overflow:hidden;aspect-ratio:1;border-radius:6px;background-color:var(--line);background-size:cover;
  background-position:center;box-shadow:0 10px 34px rgba(0,0,0,.28)}
#artist{color:var(--dim);font-size:12px;letter-spacing:.03em}
#sheet h2{margin:4px 0 12px;font:500 18px/1.35 var(--mono);letter-spacing:-.01em}
#facts{color:var(--dim);font-size:11px;line-height:1.75;margin-bottom:14px}
#links{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px}
#links a{font-size:11px;padding:9px 12px;border:1px solid var(--line);border-radius:999px;
  text-decoration:none;color:var(--ink);transition:background .2s}
#links a.p{background:var(--accent);color:var(--bg);border-color:var(--accent)}
#posts{font-size:10px;color:var(--dim);line-height:1.8}
#posts a{color:var(--dim)}

#loading{position:fixed;inset:0;display:grid;place-items:center;background:var(--bg);
  color:var(--dim);font-size:11px;letter-spacing:.3em;z-index:20;transition:opacity .5s}
#loading span{animation:pulse 1.4s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:.3}50%{opacity:1}}
#loading.off{opacity:0;pointer-events:none}

/* 幅が狭いときは、操作の列を画面の下へ (親指で届くところ) */
@media (max-width:620px){
  #top{top:auto;left:14px;right:14px;bottom:calc(14px + env(safe-area-inset-bottom));
    justify-content:flex-end}
  #q{flex:1 1 auto;width:auto;min-width:0}
  #hits{top:auto;bottom:calc(60px + env(safe-area-inset-bottom));left:14px;right:14px;width:auto;max-height:38vh}
  #hud h1{font-size:19px}
}