:root {
  --color-bg: #F7F7F5;
  --color-text: #1A1A1A;
  --color-accent: #4A7C8A;
  --color-muted: #6B6B6B;
  --color-surface: #FFFFFF;
  --color-btn-text: #FFFFFF;
  --color-focus-ring: #4A7C8A;
  --circle-inhale: #4A7C8A;
  --circle-hold: #3F7A87;
  --circle-exhale: #4E8C9A;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1A1A1A;
    --color-text: #E8E8E6;
    --color-accent: #7DB5C4;
    --color-muted: #A0A0A0;
    --color-surface: #2A2A2A;
    --color-btn-text: #1A1A1A;
    --color-focus-ring: #7DB5C4;
    --circle-inhale: #3D6E7B;
    --circle-hold: #3A6B78;
    --circle-exhale: #457D8B;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

*:focus-visible {
  outline: 3px solid var(--color-focus-ring);
  outline-offset: 3px;
}

*:focus:not(:focus-visible) {
  outline: none;
}

html {
  font-size: 100%;
  height: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 1.125rem;
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100%;
  display: flex;
  justify-content: center;
  -webkit-font-smoothing: antialiased;
}

main {
  width: 100%;
  max-width: 480px;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

h1 {
  font-size: 1.75rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  text-align: center;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-accent);
  color: var(--color-btn-text);
  padding: 0.5rem 1rem;
  z-index: 100;
  font-size: 1rem;
  text-decoration: none;
  border-radius: 0 0 0.25rem 0;
}

.skip-link:focus {
  left: 0;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.toggles {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

.toggle-btn {
  font-family: inherit;
  font-size: 1rem;
  font-weight: 500;
  min-width: 4.5rem;
  min-height: 3.5rem;
  padding: 0.5rem 1rem;
  border: 2px solid var(--color-accent);
  border-radius: 0.5rem;
  background: transparent;
  color: var(--color-accent);
  cursor: pointer;
  transition: background-color 0.2s, color 0.2s;
  -webkit-tap-highlight-color: transparent;
}

.toggle-btn[aria-pressed="true"] {
  background: var(--color-accent);
  color: var(--color-btn-text);
}

.patterns {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

.pattern-btn {
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 500;
  min-height: 2.75rem;
  padding: 0.375rem 0.75rem;
  border: 2px solid var(--color-muted);
  border-radius: 0.5rem;
  background: transparent;
  color: var(--color-muted);
  cursor: pointer;
  transition: border-color 0.2s, color 0.2s, background-color 0.2s;
  -webkit-tap-highlight-color: transparent;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.125rem;
  line-height: 1.2;
}

.pattern-name {
  font-weight: 600;
}

.pattern-timing {
  font-size: 0.75rem;
  opacity: 0.75;
}

.pattern-btn[aria-checked="true"] {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: transparent;
}

.beat-duration {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.beat-duration-label {
  font-size: 0.8125rem;
  color: var(--color-muted);
  font-weight: 500;
}

.beat-duration .stepper {
  transform: scale(0.85);
}

.custom-timing {
  display: flex;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
}

.custom-timing[hidden] {
  display: none;
}

.custom-field {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
}

.custom-field label {
  font-size: 0.8125rem;
  color: var(--color-muted);
  font-weight: 500;
}

.stepper {
  display: flex;
  align-items: center;
  gap: 0;
  border: 2px solid var(--color-accent);
  border-radius: 0.5rem;
  overflow: hidden;
}

.stepper-btn {
  font-family: inherit;
  font-size: 1.125rem;
  font-weight: 600;
  width: 2.5rem;
  height: 2.75rem;
  border: none;
  background: transparent;
  color: var(--color-accent);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  -webkit-tap-highlight-color: transparent;
}

.stepper-btn:active {
  background: var(--color-accent);
  color: var(--color-btn-text);
}

.stepper input[type="number"] {
  font-family: inherit;
  font-size: 1.125rem;
  font-weight: 600;
  width: 3rem;
  height: 2.75rem;
  border: none;
  border-left: 1px solid var(--color-accent);
  border-right: 1px solid var(--color-accent);
  background: transparent;
  color: var(--color-text);
  text-align: center;
  -moz-appearance: textfield;
  appearance: textfield;
}

.stepper input[type="number"]::-webkit-inner-spin-button,
.stepper input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.breathing-area {
  display: grid;
  place-items: center;
  width: 100%;
  min-height: 14rem;
  margin-bottom: 1.5rem;
  position: relative;
}

.circle {
  grid-area: 1 / 1;
  width: 12rem;
  height: 12rem;
  border-radius: 50%;
  background-color: var(--circle-inhale);
  display: grid;
  place-items: center;
  transform: scale(0.6);
  transition: transform 0.3s ease, background-color 0.3s ease, box-shadow 0.3s ease, opacity 0.3s ease;
  opacity: 0;
}

.circle-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0;
}

.circle.visible {
  opacity: 1;
}

.circle.phase-inhale {
  background-color: var(--circle-inhale);
  transform: scale(1);
  transition: transform 4s cubic-bezier(0.4, 0, 0.2, 1), background-color 0.5s ease;
}

.circle.phase-hold {
  background-color: var(--circle-hold);
  transform: scale(1);
  box-shadow: 0 0 30px rgba(74, 124, 138, 0.4);
  transition: background-color 0.5s ease, box-shadow 0.5s ease;
}

.circle.phase-exhale {
  background-color: var(--circle-exhale);
  transform: scale(0.6);
  transition: transform 8s cubic-bezier(0.4, 0, 0.2, 1), background-color 0.5s ease, box-shadow 0.3s ease;
}

.circle.phase-hold-out {
  background-color: var(--circle-hold);
  transform: scale(0.6);
  box-shadow: 0 0 20px rgba(74, 124, 138, 0.25);
  transition: background-color 0.5s ease, box-shadow 0.5s ease;
}

.circle.completing {
  transform: scale(0.3);
  opacity: 0;
  transition: transform 2s ease-out, opacity 2s ease-out;
}

.phase-text {
  font-size: 1.75rem;
  font-weight: 500;
  color: #FFFFFF;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  text-align: center;
  padding: 0 1rem;
  opacity: 0;
  transition: opacity 0.3s ease;
  line-height: 1.2;
}

.phase-text.visible {
  opacity: 1;
}

.countdown {
  font-size: 2.75rem;
  font-weight: 300;
  color: rgba(255, 255, 255, 0.85);
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
  text-align: center;
  line-height: 1;
  opacity: 0;
  transition: opacity 0.3s ease;
  font-variant-numeric: tabular-nums;
}

.countdown.visible {
  opacity: 1;
}

.alt-content {
  grid-area: 1 / 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  pointer-events: none;
}

.phase-text-alt {
  font-size: 2rem;
  font-weight: 500;
  color: var(--color-text);
  text-align: center;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.phase-text-alt.visible {
  opacity: 1;
}

.countdown-alt {
  font-size: 2.5rem;
  font-weight: 300;
  color: var(--color-muted);
  text-align: center;
  line-height: 1;
  opacity: 0;
  transition: opacity 0.3s ease;
  font-variant-numeric: tabular-nums;
}

.countdown-alt.visible {
  opacity: 1;
}

.breath-counter {
  font-size: 1rem;
  color: var(--color-muted);
  margin-top: 0.75rem;
  min-height: 1.5em;
  text-align: center;
}

.begin-btn {
  font-family: inherit;
  font-size: 1.25rem;
  font-weight: 600;
  width: 100%;
  max-width: 480px;
  min-height: 4rem;
  padding: 1rem 2rem;
  border: none;
  border-radius: 0.75rem;
  background: var(--color-accent);
  color: var(--color-btn-text);
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
  -webkit-tap-highlight-color: transparent;
}

.begin-btn:active {
  transform: scale(0.98);
}

.begin-btn[aria-disabled="true"] {
  opacity: 0.6;
  cursor: default;
}

.completion-msg {
  grid-area: 1 / 1;
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--color-text);
  text-align: center;
  opacity: 0;
  transform: translateY(0.5rem);
  transition: opacity 0.6s ease, transform 0.6s ease;
  pointer-events: none;
}

.completion-msg.visible {
  opacity: 1;
  transform: translateY(0);
}

.toggle-btn[aria-disabled="true"],
.pattern-btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: default;
}

.custom-timing .stepper-btn:disabled,
.custom-timing input:disabled {
  opacity: 0.5;
  cursor: default;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .circle {
    transform: scale(1) !important;
    box-shadow: none !important;
    opacity: 1 !important;
    background-color: var(--color-accent) !important;
  }

  .phase-text {
    color: var(--color-text) !important;
    text-shadow: none !important;
    opacity: 1 !important;
  }

  .countdown {
    color: var(--color-muted) !important;
    text-shadow: none !important;
    opacity: 1 !important;
  }

  .phase-text-alt {
    opacity: 1 !important;
  }

  .countdown-alt {
    opacity: 1 !important;
  }

  .completion-msg {
    transform: none !important;
  }
}

@media (prefers-color-scheme: dark) and (prefers-reduced-motion: reduce) {
  .phase-text {
    color: var(--color-text) !important;
  }

  .countdown {
    color: var(--color-muted) !important;
  }
}

@media (forced-colors: active) {
  .circle {
    border: 3px solid CanvasText;
    background: Canvas !important;
    box-shadow: none !important;
  }

  .phase-text {
    color: CanvasText !important;
    text-shadow: none !important;
  }

  .countdown {
    color: CanvasText !important;
    text-shadow: none !important;
  }

  .begin-btn,
  .toggle-btn,
  .pattern-btn {
    border: 2px solid ButtonText;
    color: ButtonText;
    background: ButtonFace;
  }

  .stepper-btn {
    border: 1px solid ButtonText;
    color: ButtonText;
    background: ButtonFace;
  }

  .stepper input[type="number"] {
    border-color: ButtonText;
    color: CanvasText;
    background: Canvas;
  }

  .toggle-btn[aria-pressed="true"],
  .pattern-btn[aria-checked="true"] {
    border-color: Highlight;
    color: Highlight;
  }

  .toggle-btn[aria-disabled="true"],
  .pattern-btn[aria-disabled="true"],
  .begin-btn[aria-disabled="true"] {
    color: GrayText;
    border-color: GrayText;
  }

  .contact a {
    color: LinkText;
  }
}

.contact {
  margin-top: 2rem;
  padding-top: 1rem;
  text-align: center;
  font-size: 0.8125rem;
}

.visit-counter {
  font-size: 0.75rem;
  color: var(--color-muted);
  opacity: 0.5;
  margin-top: 0.375rem;
}

.contact a {
  color: var(--color-muted);
  text-decoration: none;
  transition: color 0.2s;
}

.contact a:hover,
.contact a:focus {
  color: var(--color-accent);
  text-decoration: underline;
}