:root {
  color-scheme: dark;
  --bg: #090b0d;
  --surface: #12161a;
  --surface-raised: #181d22;
  --line: #2b3239;
  --text: #f5f7f8;
  --muted: #9ca7af;
  --accent: #83f7c5;
  --accent-strong: #2de39a;
  --accent-ink: #062719;
  --danger: #ff8e8e;
  --radius: 18px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

html { background: var(--bg); }

body {
  margin: 0;
  min-width: 320px;
  min-height: 100svh;
  background:
    radial-gradient(circle at 50% 14%, rgba(45, 227, 154, 0.08), transparent 34rem),
    var(--bg);
  color: var(--text);
  -webkit-tap-highlight-color: transparent;
}

button, input { font: inherit; }

button { touch-action: manipulation; }

.app-shell {
  width: min(100%, 680px);
  min-height: 100svh;
  margin: 0 auto;
  padding: max(22px, env(safe-area-inset-top)) 18px 112px;
}

.app-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.eyebrow {
  margin: 0 0 3px;
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.16em;
}

h1 { margin: 0; font-size: clamp(1.3rem, 5vw, 1.65rem); letter-spacing: -0.03em; }

.state-badge {
  display: inline-flex;
  min-height: 32px;
  align-items: center;
  padding: 0 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  background: rgba(18, 22, 26, 0.88);
  font-size: 0.78rem;
  font-weight: 700;
  white-space: nowrap;
}

.state-badge[data-state="running"] { border-color: rgba(131, 247, 197, 0.45); color: var(--accent); }
.state-badge[data-state="paused"] { color: #ffd479; }
.state-badge[data-state="finished"] { color: var(--text); }

.timer-stage {
  display: grid;
  place-items: center;
  padding: clamp(24px, 7vh, 54px) 0 clamp(22px, 6vh, 44px);
}

.timer-ring {
  position: relative;
  display: grid;
  width: min(72vw, 330px);
  aspect-ratio: 1;
  place-content: center;
  border: 1px solid #263039;
  border-radius: 50%;
  background: radial-gradient(circle, #14191d 0 52%, #0d1114 53% 64%, rgba(45, 227, 154, 0.08) 65% 66%, transparent 67%);
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.35), inset 0 0 0 10px rgba(255, 255, 255, 0.012);
  text-align: center;
}

.timer-ring::before {
  position: absolute;
  inset: -5px;
  border: 1px solid rgba(131, 247, 197, 0.14);
  border-radius: inherit;
  content: "";
}

.remaining-time {
  font-variant-numeric: tabular-nums;
  font-size: clamp(4.4rem, 18vw, 7.2rem);
  font-weight: 780;
  letter-spacing: -0.075em;
  line-height: 0.95;
  transform: translateX(-0.04em);
}

.running-bpm { margin-top: 14px; color: var(--accent); font-size: 1.05rem; font-weight: 750; letter-spacing: 0.04em; }

.settings-grid { display: grid; gap: 12px; }

.control-card {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--surface) 93%, transparent);
}

.card-heading { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 12px; }
.card-heading label, .card-heading > span:first-child { font-size: 0.88rem; font-weight: 750; }
.card-heading > span:last-child, .card-heading output { color: var(--muted); font-size: 0.78rem; }

.stepper { display: grid; grid-template-columns: 58px 1fr 58px; gap: 10px; }
.step-button, .presets button, .mute-button, .transport button {
  min-height: 48px;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: var(--surface-raised);
  color: var(--text);
  font-weight: 780;
  cursor: pointer;
}

.step-button { font-size: 1.8rem; line-height: 1; }

input[type="number"] {
  width: 100%;
  min-height: 58px;
  border: 1px solid var(--line);
  border-radius: 13px;
  outline: none;
  background: #0c0f12;
  color: var(--text);
  font-size: 1.6rem;
  font-weight: 780;
  text-align: center;
}

input[type="number"]:focus-visible, button:focus-visible, input[type="range"]:focus-visible { outline: 3px solid rgba(131, 247, 197, 0.52); outline-offset: 2px; }

.time-inputs { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 10px; }
.time-inputs label { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 8px; color: var(--muted); font-size: 0.85rem; }
.time-separator { color: var(--muted); font-size: 1.5rem; }
.presets { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 12px; }
.presets button { min-height: 44px; font-size: 0.86rem; }

.sound-controls { display: grid; grid-template-columns: 1fr auto; align-items: center; gap: 15px; }
input[type="range"] { width: 100%; accent-color: var(--accent-strong); }
.mute-button { min-width: 92px; padding: 0 14px; }
.mute-button[aria-pressed="true"] { border-color: var(--danger); color: var(--danger); }

.transport {
  position: fixed;
  z-index: 10;
  right: 0;
  bottom: max(10px, env(safe-area-inset-bottom));
  left: 50%;
  display: grid;
  width: min(calc(100% - 26px), 654px);
  grid-template-columns: 1.45fr 1fr 1fr;
  gap: 8px;
  padding: 8px;
  border: 1px solid rgba(131, 247, 197, 0.17);
  border-radius: 18px;
  background: rgba(9, 11, 13, 0.9);
  box-shadow: 0 14px 50px rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(16px);
  transform: translateX(-50%);
}
.transport button { min-height: 58px; letter-spacing: 0.045em; }
.transport .primary-action { border-color: var(--accent); background: var(--accent); color: var(--accent-ink); font-size: 1.06rem; }
.transport button:disabled { cursor: not-allowed; opacity: 0.34; }

.status-message { margin: 13px 0 0; color: var(--muted); font-size: 0.82rem; text-align: center; }

.app-shell.is-finished .timer-ring { animation: finish-pulse 700ms ease-out; }
@keyframes finish-pulse { 50% { border-color: var(--accent); box-shadow: 0 0 0 14px rgba(131, 247, 197, 0.08); } }
@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; animation: none !important; } }

@media (min-width: 620px) {
  .settings-grid { grid-template-columns: 1fr 1.1fr; }
  .sound-card { grid-column: 1 / -1; }
}

@media (max-height: 730px) {
  .timer-stage { padding-block: 18px; }
  .timer-ring { width: min(54vw, 230px); }
  .remaining-time { font-size: clamp(3.7rem, 14vw, 5.2rem); }
}

@media (max-width: 390px) {
  .app-shell { padding-inline: 13px; }
  .transport { grid-template-columns: 1.35fr 1fr 1fr; }
  .transport button { min-height: 54px; font-size: 0.78rem; }
}