:root {
  color-scheme: dark;
  --bg: #090d1f;
  --panel: rgba(12, 18, 42, 0.72);
  --panel-strong: rgba(17, 26, 58, 0.88);
  --text: #f8fbff;
  --muted: #aab6d3;
  --cyan: #52f0ff;
  --mint: #8dffcb;
  --pink: #ff5bbd;
  --amber: #ffd166;
  --line: rgba(255, 255, 255, 0.16);
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.42);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 20% 10%, rgba(82, 240, 255, 0.2), transparent 30rem),
    radial-gradient(circle at 78% 24%, rgba(255, 91, 189, 0.18), transparent 28rem),
    linear-gradient(135deg, #070a18, #101735 52%, #08111c);
  color: var(--text);
  overflow-x: hidden;
}

#aura {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.app-shell {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: grid;
  grid-template-columns: minmax(320px, 720px) minmax(280px, 360px);
  gap: 24px;
  align-items: center;
  justify-content: center;
  padding: clamp(18px, 4vw, 48px);
}

.practice-panel,
.settings {
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(24px) saturate(1.2);
}

.practice-panel {
  border-radius: 8px;
  padding: clamp(18px, 3.5vw, 34px);
}

.settings {
  border-radius: 8px;
  padding: 24px;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: start;
}

.eyebrow {
  margin: 0 0 8px;
  color: var(--mint);
  text-transform: uppercase;
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.14em;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 4.5rem);
  line-height: 0.95;
  letter-spacing: 0;
}

.session-pill {
  min-width: 92px;
  text-align: center;
  padding: 10px 14px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.09);
  font-variant-numeric: tabular-nums;
  color: #e8f7ff;
}

.breath-stage {
  display: grid;
  place-items: center;
  gap: 22px;
  padding: clamp(24px, 5vw, 44px) 0 18px;
}

.ring-wrap {
  width: min(78vw, 460px);
  aspect-ratio: 1;
}

.ring {
  position: relative;
  width: 100%;
  height: 100%;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background:
    conic-gradient(from -90deg, var(--cyan) 0deg, var(--pink) calc(var(--progress) * 0.68), var(--amber) var(--progress), rgba(255, 255, 255, 0.12) var(--progress) 360deg);
  filter: drop-shadow(0 0 34px rgba(82, 240, 255, 0.22));
}

.ring::before {
  content: "";
  position: absolute;
  inset: 18px;
  border-radius: 50%;
  background: var(--panel-strong);
  box-shadow: inset 0 0 42px rgba(255, 255, 255, 0.08);
}

.ring::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.22);
}

.halo {
  position: absolute;
  inset: 12%;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(141, 255, 203, 0.26), rgba(82, 240, 255, 0.08) 46%, transparent 68%);
  transform: scale(var(--breath-scale, 0.82));
  transition: transform 160ms linear;
}

.orb {
  position: relative;
  z-index: 2;
  width: 67%;
  height: 67%;
  border-radius: 50%;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 8px;
  text-align: center;
  background:
    radial-gradient(circle at 35% 24%, rgba(255, 255, 255, 0.42), transparent 24%),
    radial-gradient(circle at 52% 58%, rgba(82, 240, 255, 0.36), transparent 44%),
    linear-gradient(145deg, rgba(255, 91, 189, 0.7), rgba(82, 240, 255, 0.62) 55%, rgba(141, 255, 203, 0.58));
  box-shadow:
    inset 0 0 58px rgba(255, 255, 255, 0.18),
    0 18px 70px rgba(82, 240, 255, 0.2);
  transform: scale(var(--breath-scale, 0.82));
  transition: transform 160ms linear;
}

.phase {
  text-transform: uppercase;
  font-weight: 900;
  letter-spacing: 0.12em;
  font-size: clamp(0.9rem, 2vw, 1.2rem);
}

.count {
  font-size: clamp(3rem, 11vw, 6.6rem);
  font-weight: 900;
  line-height: 0.95;
  font-variant-numeric: tabular-nums;
}

.hint {
  color: rgba(255, 255, 255, 0.82);
  font-weight: 700;
}

.metrics {
  width: min(100%, 520px);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.metrics div {
  min-width: 0;
  padding: 14px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.08);
  text-align: center;
}

.metrics span {
  display: block;
  font-size: clamp(1.25rem, 3vw, 1.8rem);
  font-weight: 900;
  font-variant-numeric: tabular-nums;
}

.metrics small {
  color: var(--muted);
  font-size: 0.78rem;
}

.controls,
.presets {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

button {
  min-height: 44px;
  border: 0;
  border-radius: 8px;
  color: var(--text);
  font: inherit;
  font-weight: 850;
  cursor: pointer;
  transition: transform 150ms ease, background 150ms ease, border-color 150ms ease;
}

button:hover {
  transform: translateY(-1px);
}

.primary {
  min-width: 150px;
  padding: 12px 24px;
  background: linear-gradient(135deg, var(--cyan), var(--pink));
  color: #06101d;
}

.ghost,
.preset,
.icon-btn {
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.09);
}

.ghost {
  min-width: 110px;
  padding: 12px 20px;
}

.icon-btn {
  width: 46px;
  padding: 0;
}

.presets {
  margin-top: 18px;
}

.preset {
  min-width: 80px;
  padding: 10px 14px;
  color: #dfe8ff;
}

.preset.active {
  border-color: rgba(141, 255, 203, 0.72);
  background: rgba(141, 255, 203, 0.14);
}

.setting + .setting {
  margin-top: 24px;
}

.setting-head {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
  color: #e9f4ff;
  font-weight: 800;
}

output {
  color: var(--mint);
  font-variant-numeric: tabular-nums;
}

input[type="range"] {
  width: 100%;
  accent-color: var(--cyan);
}

.note {
  margin-top: 28px;
  padding: 16px;
  border-left: 3px solid var(--mint);
  border-radius: 8px;
  background: rgba(141, 255, 203, 0.1);
  color: #dbe6f9;
}

@media (max-width: 920px) {
  .app-shell {
    grid-template-columns: minmax(0, 720px);
    align-content: start;
  }

  .settings {
    order: 2;
  }
}

@media (max-width: 560px) {
  .app-shell {
    padding: 12px;
  }

  .practice-panel,
  .settings {
    padding: 16px;
  }

  .topbar {
    align-items: stretch;
    flex-direction: column;
  }

  .session-pill {
    align-self: flex-start;
  }

  .metrics {
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}