/* ============================================================
   Murmur — ambient focus-sound mixer. Sibling of Sweep:
   warm, calm, analog. Dark cream/amber, one screen, no chrome.
   ============================================================ */

:root {
  --bg:        #17130f;
  --bg-vignette:#0d0a07;
  --text:      #e9dcc4;
  --muted:     #9c8b72;
  --faint:     #6b5d4c;
  --amber:     #e0913a;
  --sand:      #d8a84a;
  --btn:       #261e16;
  --btn-hi:    #33291d;
  --line:      #463a2a;
}

* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }

body {
  background: radial-gradient(120% 120% at 50% 30%, var(--bg) 0%, var(--bg-vignette) 100%);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, Inter, sans-serif;
  -webkit-user-select: none;
  user-select: none;
  overscroll-behavior: none;
}

main {
  min-height: 100%;
  max-width: 430px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: clamp(8px, 1.8vh, 16px);
  padding: calc(14px + env(safe-area-inset-top, 0px))
           calc(20px + env(safe-area-inset-right, 0px))
           calc(18px + env(safe-area-inset-bottom, 0px))
           calc(20px + env(safe-area-inset-left, 0px));
}

button {
  font: inherit;
  color: var(--text);
  background: var(--btn);
  border: 1px solid var(--line);
  border-radius: 12px;
  cursor: pointer;
  touch-action: manipulation;
  transition: background .15s ease, border-color .2s ease, color .2s ease, transform .08s ease;
}
button:hover  { background: var(--btn-hi); }
button:active { transform: translateY(1px); }

header { text-align: center; line-height: 1.25; }
h1 { margin: 0; font-size: 26px; font-weight: 600; letter-spacing: .12em; }
.tag { margin: 2px 0 0; color: var(--muted); font-size: 12.5px; letter-spacing: .04em; }

/* ---------------- power ---------------- */

#power-wrap { display: flex; flex-direction: column; align-items: center; gap: 8px; }

#power {
  width: 86px; height: 86px;
  border-radius: 50%;
  border: 1.5px solid var(--line);
  background: radial-gradient(circle at 50% 38%, var(--btn-hi), var(--btn));
  display: grid; place-items: center;
  box-shadow: 0 0 0 rgba(224, 145, 58, 0);
  transition: box-shadow .8s ease, border-color .4s ease;
}
#power svg { width: 46px; height: 46px; fill: var(--text); }
.glyph-pause { display: none; }
body[data-playing="on"] .glyph-play  { display: none; }
body[data-playing="on"] .glyph-pause { display: inline; }
body[data-playing="on"] #power {
  border-color: color-mix(in srgb, var(--amber) 65%, var(--line));
  animation: breathe 4.5s ease-in-out infinite;
}
@keyframes breathe {
  0%, 100% { box-shadow: 0 0 18px rgba(224, 145, 58, .14); }
  50%      { box-shadow: 0 0 38px rgba(224, 145, 58, .34); }
}

#hint { color: var(--muted); font-size: 13px; min-height: 18px; transition: opacity .4s ease; }
body[data-playing="on"] #hint { opacity: 0; }

/* ---------------- presets ---------------- */

#presets { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; }
.p-chip { padding: 7px 13px; border-radius: 999px; font-size: 13.5px; color: var(--muted); }
.p-chip.is-active {
  color: var(--amber);
  border-color: color-mix(in srgb, var(--amber) 55%, var(--line));
  background: var(--btn-hi);
}

/* ---------------- channels ---------------- */

#channels { width: 100%; display: flex; flex-direction: column; gap: 4px; }

.ch {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 13px;
  align-items: center;
  padding: 3px 2px;
}
.ch-toggle {
  width: 42px; height: 42px;
  border-radius: 50%;
  display: grid; place-items: center;
  color: var(--faint);
}
.ch[data-on="1"] .ch-toggle {
  color: var(--amber);
  border-color: color-mix(in srgb, var(--amber) 45%, var(--line));
}
.ch-toggle svg {
  width: 22px; height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.4;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.ch-body { display: flex; flex-direction: column; gap: 3px; }
.ch-name { font-size: 13.5px; letter-spacing: .05em; color: var(--muted); }
.ch[data-on="1"] .ch-name { color: var(--text); }
.ch[data-on="0"] .ch-body { opacity: .55; }

.ch input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 24px;
  margin: 0;
  background: transparent;
}
.ch input[type="range"]::-webkit-slider-runnable-track {
  height: 4px;
  border-radius: 2px;
  background: linear-gradient(to right,
    var(--amber) 0 calc(var(--val, 0) * 1%),
    var(--line)  calc(var(--val, 0) * 1%) 100%);
}
.ch input[type="range"]::-moz-range-track    { height: 4px; border-radius: 2px; background: var(--line); }
.ch input[type="range"]::-moz-range-progress { height: 4px; border-radius: 2px; background: var(--amber); }
.ch input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--text);
  border: 1px solid #0d0a07;
  margin-top: -8px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, .45);
}
.ch input[type="range"]::-moz-range-thumb {
  width: 20px; height: 20px;
  border-radius: 50%;
  background: var(--text);
  border: 1px solid #0d0a07;
  box-shadow: 0 2px 6px rgba(0, 0, 0, .45);
}

/* ---------------- timer ---------------- */

#timer-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  width: 100%;
}
.t-label { color: var(--faint); font-size: 12.5px; letter-spacing: .08em; margin-right: 2px; }
.t-chip {
  min-width: 44px;
  padding: 7px 10px;
  border-radius: 999px;
  font-size: 13.5px;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}
.t-chip.is-active {
  color: var(--amber);
  border-color: color-mix(in srgb, var(--amber) 55%, var(--line));
  background: var(--btn-hi);
}
#countdown {
  color: var(--sand);
  font-size: 14px;
  font-variant-numeric: tabular-nums;
  min-width: 52px;
  text-align: left;
}
#countdown[hidden] { display: none; }
#countdown.ending { color: var(--amber); }

footer {
  color: var(--faint);
  font-size: 11.5px;
  letter-spacing: .06em;
  margin-top: auto;
  text-align: center;
}

@media (prefers-reduced-motion: reduce) {
  body[data-playing="on"] #power { animation: none; box-shadow: 0 0 22px rgba(224, 145, 58, .22); }
}