:root{
  --bg:#0a0410;
  --bg2:#150826;
  --panel:rgba(255,255,255,.06);
  --panel-b:rgba(255,255,255,.12);
  --neon:#ff2d78;
  --neon2:#00e5ff;
  --neon3:#ffd23f;
  --ok:#2dffb0;
  --warn:#ffb02d;
  --text:#ffffff;
  --muted:#b9a8cf;
  --gold:#ffd23f;
}

*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{height:100%}
body{
  margin:0;
  font-family:-apple-system,BlinkMacSystemFont,"Hiragino Kaku Gothic ProN","Yu Gothic",Meiryo,system-ui,sans-serif;
  color:var(--text);
  background:
    radial-gradient(120% 80% at 50% -10%, #2a0f3f 0%, var(--bg2) 45%, var(--bg) 100%);
  background-attachment:fixed;
  overflow-x:hidden;
  -webkit-user-select:none;user-select:none;
}

#app{min-height:100vh;min-height:100dvh;display:flex;flex-direction:column}

.view{
  flex:1;display:none;flex-direction:column;align-items:center;
  padding:24px 20px calc(24px + env(safe-area-inset-bottom));
  gap:18px;text-align:center;
}
.view.active{display:flex}

/* ---------- typography ---------- */
h1{font-size:34px;font-weight:900;margin:0;letter-spacing:.04em;line-height:1.1}
h2{font-size:22px;font-weight:800;margin:0}
.brand{
  font-size:44px;font-weight:900;letter-spacing:.06em;
  background:linear-gradient(90deg,var(--neon),var(--neon3));
  -webkit-background-clip:text;background-clip:text;color:transparent;
  text-shadow:0 0 30px rgba(255,45,120,.35);
}
.sub{color:var(--muted);font-size:15px;line-height:1.6;margin:0}
.spacer{flex:1}

/* ---------- buttons ---------- */
.btn{
  display:flex;align-items:center;justify-content:center;gap:8px;
  width:100%;max-width:420px;padding:18px 20px;border:none;border-radius:16px;
  font-size:19px;font-weight:800;color:#fff;cursor:pointer;
  background:linear-gradient(135deg,var(--neon),#c81e88);
  box-shadow:0 8px 24px rgba(255,45,120,.35);
  transition:transform .08s ease, box-shadow .2s ease, opacity .2s;
}
.btn:active{transform:scale(.97)}
.btn.secondary{background:var(--panel);border:1px solid var(--panel-b);box-shadow:none}
.btn.ghost{background:transparent;border:1px solid var(--panel-b);box-shadow:none;font-weight:700}
.btn.big{padding:22px;font-size:22px}
.btn:disabled{opacity:.4;cursor:not-allowed;box-shadow:none}
.btn.cyan{background:linear-gradient(135deg,var(--neon2),#0091c8);box-shadow:0 8px 24px rgba(0,229,255,.3)}

input.field{
  width:100%;max-width:420px;padding:16px 18px;border-radius:14px;
  border:1px solid var(--panel-b);background:rgba(0,0,0,.35);color:#fff;
  font-size:20px;text-align:center;outline:none;
}
input.field::placeholder{color:var(--muted)}
input.code{letter-spacing:.4em;text-transform:uppercase;font-weight:800;font-size:26px}

.panel{
  width:100%;max-width:420px;background:var(--panel);
  border:1px solid var(--panel-b);border-radius:18px;padding:18px;
}

/* ---------- heart / pulse ---------- */
.heart-wrap{position:relative;display:flex;align-items:center;justify-content:center;margin:6px 0}
.heart{
  font-size:120px;line-height:1;filter:drop-shadow(0 0 24px rgba(255,45,120,.6));
  animation:beat 1s ease-in-out infinite;transform-origin:center;
}
.heart.idle{animation-duration:1.6s;opacity:.5;filter:drop-shadow(0 0 10px rgba(255,45,120,.25))}
@keyframes beat{0%,100%{transform:scale(1)}12%{transform:scale(1.22)}24%{transform:scale(1)}36%{transform:scale(1.12)}50%{transform:scale(1)}}

.bpm{font-size:82px;font-weight:900;line-height:1;letter-spacing:-.02em;
  text-shadow:0 0 30px rgba(255,45,120,.5)}
.bpm small{font-size:22px;font-weight:700;color:var(--muted);margin-left:6px}
.bpm.dim{opacity:.35}

.status{font-size:18px;font-weight:800;padding:8px 16px;border-radius:999px;
  background:var(--panel);border:1px solid var(--panel-b)}
.status.ok{color:var(--ok);border-color:rgba(45,255,176,.4)}
.status.detecting{color:var(--warn)}
.status.no-finger{color:var(--neon)}

/* PPG 波形 */
.wave{width:100%;max-width:380px;height:auto;aspect-ratio:600/150;
  background:rgba(0,0,0,.4);border-radius:14px;border:1px solid var(--panel-b);display:block}
#m-wave{aspect-ratio:600/110}

/* quality bar */
.qbar{width:100%;max-width:360px;height:10px;border-radius:999px;background:rgba(255,255,255,.1);overflow:hidden}
.qbar > i{display:block;height:100%;width:0%;background:linear-gradient(90deg,var(--neon),var(--neon3));transition:width .25s}

/* countdown ring / progress */
.timebar{width:100%;max-width:420px;height:14px;border-radius:999px;background:rgba(255,255,255,.1);overflow:hidden}
.timebar > i{display:block;height:100%;width:100%;background:linear-gradient(90deg,var(--neon2),var(--neon));transition:width .2s linear}

.hint{color:var(--muted);font-size:14px;line-height:1.6;max-width:420px}
.warnbox{background:rgba(255,176,45,.12);border:1px solid rgba(255,176,45,.4);color:#ffd8a0;
  border-radius:14px;padding:12px 14px;font-size:14px;line-height:1.6;max-width:420px}

/* ---------- room / participants ---------- */
.code-big{font-size:56px;font-weight:900;letter-spacing:.25em;
  background:linear-gradient(90deg,var(--neon2),var(--neon));-webkit-background-clip:text;background-clip:text;color:transparent}
#qrcanvas{background:#fff;border-radius:14px;padding:10px;width:200px;height:200px}
.plist{width:100%;max-width:420px;display:flex;flex-direction:column;gap:8px}
.pitem{display:flex;align-items:center;gap:10px;padding:12px 14px;border-radius:12px;
  background:var(--panel);border:1px solid var(--panel-b);font-size:17px;font-weight:700}
.pitem .dot{width:10px;height:10px;border-radius:50%;background:var(--muted);flex:none}
.pitem .dot.ready{background:var(--ok);box-shadow:0 0 10px var(--ok)}
.pitem .tag{margin-left:auto;font-size:12px;color:var(--neon3);font-weight:800}
.pitem .live{margin-left:auto;font-weight:900;color:var(--neon2)}

/* ---------- topic ---------- */
.topic-cat{font-size:16px;font-weight:900;color:var(--neon3);letter-spacing:.1em;
  padding:6px 16px;border:1px solid rgba(255,210,63,.5);border-radius:999px}
.topic-text{font-size:32px;font-weight:900;line-height:1.4;max-width:520px;
  text-shadow:0 0 30px rgba(255,45,120,.3)}
.count{font-size:120px;font-weight:900;line-height:1;
  background:linear-gradient(90deg,var(--neon),var(--neon3));-webkit-background-clip:text;background-clip:text;color:transparent;
  animation:pop .6s ease}
@keyframes pop{0%{transform:scale(.4);opacity:0}60%{transform:scale(1.1)}100%{transform:scale(1);opacity:1}}

/* ---------- reveal ranking ---------- */
.rank{width:100%;max-width:460px;display:flex;flex-direction:column;gap:10px}
.rank-1{
  padding:22px;border-radius:20px;text-align:center;
  background:linear-gradient(135deg,rgba(255,210,63,.22),rgba(255,45,120,.22));
  border:2px solid var(--gold);box-shadow:0 0 40px rgba(255,210,63,.35);
  animation:winner .8s ease;
}
@keyframes winner{0%{transform:scale(.6) rotate(-3deg);opacity:0}55%{transform:scale(1.08)}100%{transform:scale(1)}}
.rank-1 .who{font-size:40px;font-weight:900;margin:6px 0}
.rank-1 .delta{font-size:26px;font-weight:900;color:var(--gold)}
.crown{font-size:40px}
.rrow{display:flex;align-items:center;gap:12px;padding:12px 16px;border-radius:14px;
  background:var(--panel);border:1px solid var(--panel-b)}
.rrow .pos{font-size:22px;font-weight:900;width:34px;color:var(--muted)}
.rrow .nm{font-size:18px;font-weight:800}
.rrow .d{margin-left:auto;font-size:20px;font-weight:900;color:var(--neon2)}
.rrow .d.up{color:var(--neon)}
.rrow .bpm-s{color:var(--muted);font-size:13px;font-weight:700}

.badge{position:fixed;top:calc(8px + env(safe-area-inset-top));left:10px;font-size:12px;color:var(--muted);
  background:rgba(0,0,0,.4);padding:6px 10px;border-radius:999px;border:1px solid var(--panel-b);z-index:5}
.toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);
  background:rgba(0,0,0,.85);border:1px solid var(--panel-b);color:#fff;
  padding:12px 18px;border-radius:12px;font-size:14px;z-index:50;max-width:90vw;text-align:center;
  opacity:0;transition:opacity .25s;pointer-events:none}
.toast.show{opacity:1}
.row{display:flex;gap:12px;width:100%;max-width:420px}
.row .btn{flex:1}
.foot{color:var(--muted);font-size:12px;opacity:.7}
a{color:var(--neon2)}