:root {
  color-scheme: dark;

  --color-midnight: oklch(0.10 0.012 295);
  --color-midnight-deep: oklch(0.065 0.008 295);
  --color-surface: oklch(0.16 0.018 295);
  --color-surface-raised: oklch(0.185 0.021 295);
  --color-surface-active: oklch(0.225 0.026 295);
  --color-moss: oklch(0.62 0.142 130);
  --color-moss-active: oklch(0.54 0.13 130);
  --color-iris: oklch(0.46 0.12 295);
  --color-focus: oklch(0.74 0.12 295);
  --color-frost: oklch(0.93 0.012 295);
  --color-muted: oklch(0.68 0.025 295);
  --color-subtle: oklch(0.50 0.024 295);
  --color-divider: oklch(0.28 0.028 295);
  --color-error: oklch(0.72 0.15 25);

  --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
  --font-clock: "Bahnschrift Condensed", "Arial Narrow", "Aptos Narrow", "Roboto Condensed", sans-serif;

  --text-caption: 0.875rem;
  --text-body: 1rem;
  --text-title: 1.25rem;

  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;

  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-pill: 999rem;

  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --ease-out-quint: cubic-bezier(0.22, 1, 0.36, 1);

  --z-controls: 10;
  --z-dialog: 20;
  --z-toast: 30;

  font-family: var(--font-ui);
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  font-kerning: normal;
}

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

html,
body {
  width: 100%;
  min-width: 20rem;
  min-height: 100%;
  margin: 0;
  overflow: hidden;
  background: var(--color-midnight);
}

body {
  min-height: 100vh;
  min-height: 100svh;
  min-height: 100dvh;
  color: var(--color-frost);
  font-size: var(--text-body);
  line-height: 1.55;
  letter-spacing: 0.01em;
  overscroll-behavior: none;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  -webkit-font-smoothing: antialiased;
}

button,
input {
  font: inherit;
}

button {
  color: inherit;
}

button:focus {
  outline: none;
}

button:focus-visible,
input:focus-visible,
.clock-display:focus-visible {
  outline: 0.1875rem solid var(--color-focus);
  outline-offset: 0.1875rem;
}

[hidden] {
  display: none !important;
}

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

.skip-link {
  position: fixed;
  inset-block-start: var(--space-sm);
  inset-inline-start: var(--space-sm);
  z-index: var(--z-toast);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  background: var(--color-frost);
  color: var(--color-midnight);
  font-weight: 650;
  text-decoration: none;
  transform: translateY(-180%);
  transition: transform 180ms var(--ease-out-quart);
}

.skip-link:focus {
  transform: translateY(0);
}

.app-shell,
.timer-stage {
  width: 100%;
  min-height: 100vh;
  min-height: 100svh;
  min-height: 100dvh;
}

.app-shell {
  position: relative;
  isolation: isolate;
  background: var(--color-midnight);
}

.timer-stage {
  display: grid;
  place-items: center;
  padding:
    max(var(--space-lg), env(safe-area-inset-top))
    max(var(--space-md), env(safe-area-inset-right))
    max(var(--space-lg), env(safe-area-inset-bottom))
    max(var(--space-md), env(safe-area-inset-left));
}

.clock-display {
  --card-width: min(29vw, 34dvh);
  --card-gap: clamp(0.375rem, 1.8vw, 1.75rem);

  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--card-gap);
  width: 100%;
  max-width: 100rem;
  perspective: 75rem;
  user-select: none;
  -webkit-user-select: none;
}

.flip-card {
  position: relative;
  display: grid;
  place-items: center;
  flex: 0 0 var(--card-width);
  width: var(--card-width);
  aspect-ratio: 0.68;
  overflow: hidden;
  contain: layout paint style;
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  transform: translateZ(0);
}

.flip-card::before {
  content: "";
  position: absolute;
  inset: 0 0 50%;
  z-index: 0;
  background: var(--color-surface-raised);
}

.flip-card__value,
.flip-card__leaf {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding-block-start: 0.035em;
  color: var(--color-frost);
  font-family: var(--font-clock);
  font-size: calc(var(--card-width) * 1.08);
  font-stretch: condensed;
  font-variant-numeric: tabular-nums lining-nums;
  font-feature-settings: "tnum" 1, "lnum" 1;
  font-weight: 320;
  line-height: 0.8;
  letter-spacing: -0.035em;
  text-align: center;
}

.flip-card__value {
  z-index: 1;
}

.flip-card__leaf {
  z-index: 3;
  opacity: 0;
  background: var(--color-surface-raised);
  clip-path: inset(0 0 50% 0);
  transform: rotateX(0deg);
  transform-origin: center center;
  backface-visibility: hidden;
  pointer-events: none;
}

.flip-card__seam {
  position: absolute;
  inset: 50% 0 auto;
  z-index: 4;
  height: 1px;
  background: var(--color-midnight-deep);
  pointer-events: none;
}

.flip-card.is-flipping .flip-card__leaf {
  opacity: 1;
  animation: flip-leaf 360ms var(--ease-out-quart) both;
}

.flip-card.is-flipping .flip-card__value {
  animation: reveal-value 360ms var(--ease-out-quint) both;
}

.timer-stage.is-complete .flip-card__value {
  color: var(--color-moss);
  transition: color 220ms var(--ease-out-quart);
}

@keyframes flip-leaf {
  0% {
    opacity: 1;
    transform: rotateX(0deg);
  }
  70% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: rotateX(-88deg);
  }
}

@keyframes reveal-value {
  0%,
  52% {
    filter: brightness(0.78);
  }
  100% {
    filter: brightness(1);
  }
}

.control-layer {
  position: fixed;
  inset: auto 0 0;
  z-index: var(--z-controls);
  display: flex;
  justify-content: center;
  padding:
    var(--space-lg)
    max(var(--space-md), env(safe-area-inset-right))
    max(var(--space-lg), env(safe-area-inset-bottom))
    max(var(--space-md), env(safe-area-inset-left));
  opacity: 0;
  visibility: hidden;
  transform: translateY(1rem);
  pointer-events: none;
  transition:
    opacity 180ms var(--ease-out-quart),
    transform 220ms var(--ease-out-quart),
    visibility 0s linear 220ms;
}

.controls-visible .control-layer {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
  transition-delay: 0s;
}

body.is-running:not(.controls-visible),
body.is-fullscreen:not(.controls-visible) {
  cursor: none;
}

.control-dock {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  max-width: min(100%, 48rem);
  padding: var(--space-xs);
  border-radius: var(--radius-lg);
  background: var(--color-surface-raised);
  box-shadow: 0 4px 8px oklch(0.04 0 0 / 0.32);
}

.mode-switch,
.action-group {
  display: flex;
  align-items: center;
}

.mode-switch {
  gap: var(--space-2xs);
  padding: var(--space-2xs);
  border-radius: var(--radius-md);
  background: var(--color-midnight);
}

.mode-button,
.action-button,
.preset-list button,
.button-primary,
.button-secondary,
.dialog-close {
  min-height: 2.75rem;
  border: 0;
  cursor: pointer;
  transition:
    background-color 150ms var(--ease-out-quart),
    color 150ms var(--ease-out-quart),
    transform 100ms var(--ease-out-quart);
}

.mode-button {
  padding: 0 var(--space-sm);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-muted);
  font-size: var(--text-caption);
  font-weight: 600;
  white-space: nowrap;
}

.mode-button.is-active {
  background: var(--color-surface-active);
  color: var(--color-frost);
}

.dock-divider {
  width: 1px;
  height: 1.75rem;
  background: var(--color-divider);
}

.action-group {
  gap: var(--space-2xs);
}

.action-button,
.dialog-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  min-width: 2.75rem;
  padding: 0 var(--space-sm);
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-muted);
}

.action-button--primary {
  background: var(--color-moss);
  color: var(--color-frost);
  font-weight: 700;
}

.action-button svg,
.dialog-close svg {
  width: 1.25rem;
  height: 1.25rem;
  overflow: visible;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.action-button .icon-play path,
.action-button .icon-pause path {
  fill: currentColor;
  stroke: none;
}

.icon-pause,
.icon-exit-fullscreen {
  display: none;
}

body.is-running .icon-play,
body.is-fullscreen .icon-enter-fullscreen {
  display: none;
}

body.is-running .icon-pause,
body.is-fullscreen .icon-exit-fullscreen {
  display: block;
}

body[data-mode="clock"] .timer-only {
  display: none;
}

.action-label {
  font-size: var(--text-caption);
  white-space: nowrap;
}

.settings-dialog {
  z-index: var(--z-dialog);
  width: min(calc(100vw - 2rem), 30rem);
  max-height: min(calc(100dvh - 2rem), 46rem);
  margin: auto;
  padding: 0;
  overflow: auto;
  border: 0;
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  color: var(--color-frost);
  box-shadow: 0 6px 8px oklch(0.04 0 0 / 0.42);
}

.settings-dialog::backdrop {
  background: oklch(0.04 0 0 / 0.78);
}

.settings-dialog[open] {
  animation: dialog-enter 240ms var(--ease-out-quint) both;
}

.settings-dialog form {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  padding: var(--space-lg);
}

.dialog-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-md);
}

.dialog-header h1 {
  margin: 0;
  font-size: var(--text-title);
  font-weight: 700;
  line-height: 1.25;
}

.dialog-header p {
  max-width: 34ch;
  margin: var(--space-xs) 0 0;
  color: var(--color-muted);
  font-size: var(--text-caption);
  line-height: 1.6;
}

.dialog-close {
  flex: 0 0 2.75rem;
  padding: 0;
}

.settings-group {
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.settings-group legend {
  margin-block-end: var(--space-sm);
  color: var(--color-frost);
  font-size: var(--text-caption);
  font-weight: 650;
}

.preset-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.preset-list button {
  flex: 1 1 5.25rem;
  padding-inline: var(--space-sm);
  border-radius: var(--radius-sm);
  background: var(--color-surface-active);
  color: var(--color-frost);
  font-size: var(--text-caption);
  font-weight: 600;
}

.time-fields {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: end;
  gap: var(--space-xs);
}

.time-fields label {
  display: grid;
  gap: var(--space-xs);
  min-width: 0;
  color: var(--color-muted);
  font-size: var(--text-caption);
}

.time-fields input {
  width: 100%;
  min-height: 3rem;
  padding: 0 var(--space-sm);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-sm);
  background: var(--color-midnight);
  color: var(--color-frost);
  font-variant-numeric: tabular-nums;
  font-weight: 650;
  text-align: center;
  appearance: textfield;
}

.time-fields input::-webkit-inner-spin-button,
.time-fields input::-webkit-outer-spin-button {
  margin: 0;
  appearance: none;
}

.time-separator {
  padding-block-end: 0.65rem;
  color: var(--color-subtle);
  font-weight: 700;
}

.field-error {
  margin: var(--space-xs) 0 0;
  color: var(--color-error);
  font-size: var(--text-caption);
}

.preference-list {
  display: grid;
  gap: var(--space-2xs);
}

.preference-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  min-height: 3.5rem;
  padding-block: var(--space-xs);
  cursor: pointer;
}

.preference-row span {
  display: grid;
  gap: 0.125rem;
}

.preference-row strong {
  font-size: var(--text-caption);
  font-weight: 650;
}

.preference-row small {
  color: var(--color-muted);
  font-size: 0.8125rem;
}

.preference-row input {
  width: 1.25rem;
  height: 1.25rem;
  flex: 0 0 auto;
  accent-color: var(--color-moss);
}

.dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-sm);
  padding-block-start: var(--space-xs);
}

.button-primary,
.button-secondary {
  min-width: 6.5rem;
  padding: 0 var(--space-md);
  border-radius: var(--radius-sm);
  font-size: var(--text-caption);
  font-weight: 700;
}

.button-primary {
  background: var(--color-moss);
  color: var(--color-frost);
}

.button-secondary {
  background: var(--color-surface-active);
  color: var(--color-frost);
}

.toast {
  position: fixed;
  inset: max(var(--space-lg), env(safe-area-inset-top)) auto auto 50%;
  z-index: var(--z-toast);
  max-width: min(calc(100vw - 2rem), 28rem);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-pill);
  background: var(--color-frost);
  color: var(--color-midnight);
  font-size: var(--text-caption);
  font-weight: 650;
  text-align: center;
  opacity: 0;
  visibility: hidden;
  transform: translate(-50%, -0.5rem);
  transition:
    opacity 180ms var(--ease-out-quart),
    transform 220ms var(--ease-out-quart),
    visibility 0s linear 220ms;
}

.toast.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
  transition-delay: 0s;
}

.noscript-message {
  position: fixed;
  inset: 50% auto auto 50%;
  z-index: var(--z-toast);
  margin: 0;
  padding: var(--space-md);
  color: var(--color-frost);
  transform: translate(-50%, -50%);
}

@keyframes dialog-enter {
  from {
    opacity: 0;
    transform: translateY(0.75rem) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@media (hover: hover) {
  .mode-button:hover,
  .action-button:hover,
  .dialog-close:hover {
    background: var(--color-surface-active);
    color: var(--color-frost);
  }

  .action-button--primary:hover,
  .button-primary:hover {
    background: var(--color-moss-active);
  }

  .preset-list button:hover,
  .button-secondary:hover {
    background: var(--color-iris);
  }
}

.mode-button:active,
.action-button:active,
.preset-list button:active,
.button-primary:active,
.button-secondary:active,
.dialog-close:active {
  transform: scale(0.96);
}

@media (max-width: 42rem) {
  .control-dock {
    flex-direction: column;
    gap: var(--space-xs);
  }

  .dock-divider {
    display: none;
  }

  .mode-switch,
  .action-group {
    width: 100%;
    justify-content: center;
  }

  .mode-button {
    flex: 1 1 0;
  }

  .action-button {
    min-width: 3rem;
    padding-inline: var(--space-sm);
  }

  .action-label {
    display: none;
  }

  .action-button--primary {
    min-width: 4rem;
  }
}

@media (max-height: 31rem) {
  .clock-display {
    --card-width: min(29vw, 31dvh);
  }

  .control-layer {
    padding-block: var(--space-xs) max(var(--space-xs), env(safe-area-inset-bottom));
  }

  .control-dock {
    flex-direction: row;
    gap: var(--space-xs);
  }

  .dock-divider {
    display: block;
  }

  .mode-switch,
  .action-group {
    width: auto;
  }

  .mode-button {
    min-height: 2.75rem;
    padding-inline: var(--space-xs);
  }

  .action-label {
    display: none;
  }
}

@media (pointer: coarse) {
  .mode-button,
  .action-button,
  .dialog-close,
  .preset-list button,
  .button-primary,
  .button-secondary {
    min-height: 3rem;
  }
}

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

  .flip-card__leaf {
    display: none;
  }
}

@media (forced-colors: active) {
  .flip-card,
  .control-dock,
  .settings-dialog,
  .time-fields input {
    border: 1px solid CanvasText;
  }

  .flip-card__seam,
  .dock-divider {
    background: CanvasText;
  }
}