:root {
  --blue: #a0c1c5;
  --green: #b5dba7;
  --pink: #e9c6c8;
  --idle: #eef5f2;
  --dark: #17312b;
  --panel: rgba(255, 255, 255, 0.6);
  --text: 0, 0, 0;
  --muted: #486158;
  --fade-duration: 700ms;
  --radius: 5px;
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  font-family: inter, "Plus Jakarta Sans", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: rgba(var(--text), .73);
  background: var(--idle);
  transition: background-color var(--fade-duration) ease;
}

body.breath-in {
  background-color: var(--blue);
}

body.breath-out {
  background-color: var(--green);
}

body.breath-paused {
  background-color: var(--pink);
}

body.breath-idle {
  background-color: var(--idle);
}

.breathing-app {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.breathing-card {
  width: min(100%, 660px);
  padding: 32px;
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.18);
  backdrop-filter: blur(10px);
  text-align: center;
}

h1 {
  margin: 0 0 1.5rem;
  font-size: clamp(1.5rem, 0.607rem + 2.381vw, 2.75rem);
  line-height: 1;
}

.intro {
  margin: 0 auto 24px;
  max-width: 38rem;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.5;
}

.settings-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 12px;
}

@media (min-width: 720px) {
  .settings-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

.control-group {
  text-align: left;
}

label {
  display: block;
  margin-bottom: 8px;
  font-weight: 700;
}

select {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid rgba(16, 37, 31, 0.18);
  border-radius: var(--radius);
  font-size: 1rem;
  background: white;
}

.method-description,
.voice-description {
  min-height: 1.5em;
  margin: 0 0 8px;
  color: var(--muted);
}

.voice-description {
  margin-bottom: 18px;
  font-size: 0.95rem;
}

.timer-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 22px 0 10px;
}

.timer-panel > div {
  padding: 12px;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(16, 37, 31, 0.1);
}

.timer-panel span {
  display: block;
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 0.85rem;
}

.timer-panel strong {
  display: block;
  font-size: clamp(1.25rem, 4vw, 1.8rem);
  line-height: 1;
}

.breath-visual {
  display: grid;
  place-items: center;
  margin: 28px 0;
}

.breath-circle {
  width: min(75vw, 350px);
  height: min(75vw, 350px);
  border-radius: 1000%;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.6);
  border: 8px solid rgba(255, 255, 255, 0.75);
  box-shadow:
    inset 0 0 60px rgba(255, 255, 255, 0.35),
    0 20px 50px rgba(0, 0, 0, 0.12);
  transform: scale(0.82);
}

.breath-circle.inhaling {
  transform: scale(1);
}

.breath-circle.exhaling {
  transform: scale(0.78);
}

#phaseText {
  font-size: clamp(1.6rem, 7vw, 2.8rem);
  font-weight: 800;
}

#countdown {
  font-size: clamp(2.5rem, 12vw, 5.5rem);
  line-height: 1;
}

.button-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

button {
  cursor: pointer;
  border: 0;
  border-radius: var(--radius);
  padding: 14px 24px;
  font-size: 1rem;
  font-weight: 800;
  background: var(--dark);
  color: white;
}

button:hover {
  filter: brightness(1.1);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

#resetBtn {
  background: rgba(16, 37, 31, 0.12);
  color: var(--dark);
}

.small-note {
  margin: 22px 0 0;
  font-size: 0.9rem;
  color: var(--muted);
}

code {
  padding: 2px 4px;
  border-radius: var(--radius);
  background: rgba(16, 37, 31, 0.08);
}