/* style.css
   Minimalist Tap Tempo app styles.
   Шрифт: Roboto.
*/

:root{
  --bg:#ffffff;
  --text:#1a1a1a;
  --muted:#666;
  --accent:#222;
  --circle-size: min(48vmin, 420px);
  --pastel-duration: 550ms;
  --control-gap: 10px;
  --radius: 22px;
  --shadow: 0 6px 20px rgba(10,10,10,0.06);
  --glass: rgba(255,255,255,0.6);
}

*{box-sizing:border-box}
html,body,#app{height:100%;margin:0;font-family:Roboto,system-ui,-apple-system,Segoe UI,Roboto,Arial;}
body{background:var(--bg);color:var(--text);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;}
main{height:100%;overflow-y:auto;scroll-behavior:smooth;}

/* Each slide = full viewport height */
.slide{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px;}
.header{max-width:900px;text-align:center;margin-bottom:18px;}
.header h1{font-weight:700;margin:0;font-size:20px}
.instr{color:var(--muted);margin-top:6px}

/* Center area holds interactive circle + controls */
.center-area{display:flex;flex-direction:column;align-items:center;gap:18px;width:100%;max-width:1100px;padding:18px}
.bpm-circle{
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  width:var(--circle-size);height:var(--circle-size);border-radius:50%;
  background:linear-gradient(180deg, rgba(250,250,250,1), rgba(245,245,245,1));
  box-shadow: var(--shadow);
  border: 6px solid rgba(0,0,0,0.04);
  transition: transform 160ms ease, box-shadow 160ms;
  cursor:pointer;
  user-select:none;
}
.bpm-circle:active{transform:scale(0.99)}
.bpm-value{font-size: clamp(34px, 14vmin, 120px); font-weight:900; letter-spacing: -2px;}
.bpm-label{font-size:18px;color:var(--muted);margin-top:6px}

/* Controls */
.controls{display:flex;flex-direction:column;align-items:center;gap:12px;width:100%}
.smoothing{display:flex;align-items:center;gap:10px}
.adjust{display:flex;gap:8px}
.adjust button, .actions button, .preset-actions button{
  background:#fff;border:1px solid #eee;padding:8px 12px;border-radius:10px;cursor:pointer;box-shadow:var(--shadow);
}
.adjust button{min-width:56px}
.toggle{display:inline-flex;align-items:center;gap:8px;padding:6px 8px;background:transparent;border-radius:8px;color:var(--muted)}

/* Presets */
.presets{width:100%;max-width:720px;margin-top:8px}
.presets-list{display:flex;flex-wrap:wrap;gap:8px;margin:8px 0}
.preset-badge{padding:8px 12px;border-radius:999px;background:#f5f7fb;border:1px solid #eee;cursor:pointer;box-shadow:var(--shadow)}

/* Hotkeys hint */
.hotkeys{margin-top:8px;color:var(--muted);display:flex;gap:12px;flex-wrap:wrap;justify-content:center;font-size:13px}
kbd{background:#f3f4f6;padding:4px 8px;border-radius:6px;border:1px solid #e6e7ea;font-weight:700}

/* Info slide */
.info{max-width:900px;padding:18px}
.info h2{margin-top:0}
.footer{margin-top:28px;color:var(--muted)}

/* Pastel flash overlay */
.flash {
  position:fixed;inset:0;pointer-events:none;mix-blend-mode:normal;opacity:0;transition:opacity var(--pastel-duration) ease;
  z-index:0;
}
.flash.show{opacity:1}

/* Responsive */
@media (max-width:700px){
  :root{--circle-size: min(70vmin, 340px)}
  .header h1{font-size:18px}
  .bpm-label{font-size:15px}
  .hotkeys{font-size:12px}
}

/* Small visual polish */
.info ul{line-height:1.5}