:root {
  --ink: #141210;
  --paper: #f4f0e8;
  --font: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
}

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

html,
body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: var(--font);
  background: var(--paper);
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}

.hidden {
  display: none !important;
}

/* Ink fill layer — grows upward from the bottom */
.ink-fill {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  height: 0%;
  z-index: 0;
  pointer-events: none;
  background: var(--ink);
  will-change: height;
}

.ink-fill.animate-reset {
  transition: height 0.45s ease;
}

.ink-fill.pulse-once {
  animation: ink-pulse 0.9s ease-in-out 1;
}

@keyframes ink-pulse {
  0%,
  100% {
    filter: brightness(1);
  }
  50% {
    filter: brightness(1.35);
  }
}

/* App shell */
.app {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  padding: max(1.5rem, env(safe-area-inset-top))
    max(1.5rem, env(safe-area-inset-right))
    max(1.5rem, env(safe-area-inset-bottom))
    max(1.5rem, env(safe-area-inset-left));
}

.panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  max-width: 28rem;
  gap: 2rem;
}

/* Setup */
.task-input {
  width: 100%;
  border: none;
  border-bottom: 2px solid var(--ink);
  background: transparent;
  font: inherit;
  font-size: 1.125rem;
  padding: 0.5rem 0;
  color: var(--ink);
  text-align: center;
  outline: none;
}

.task-input::placeholder {
  color: color-mix(in srgb, var(--ink) 40%, transparent);
}

.duration {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  width: 100%;
}

.duration-row {
  display: flex;
  align-items: flex-end;
  justify-content: center;
  gap: 0.75rem;
  width: 100%;
}

.field {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
}

.field-label {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0.55;
}

.field select {
  appearance: none;
  border: 2px solid var(--ink);
  background: var(--paper);
  font: inherit;
  font-size: 2rem;
  font-variant-numeric: tabular-nums;
  padding: 0.35rem 1.25rem;
  min-width: 5.5rem;
  text-align: center;
  cursor: pointer;
  color: var(--ink);
  border-radius: 0;
}

.duration-colon {
  font-size: 2rem;
  font-weight: 300;
  padding-bottom: 0.55rem;
  opacity: 0.5;
}

.text-btn {
  border: none;
  background: none;
  font: inherit;
  font-size: 0.875rem;
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
  color: var(--ink);
  opacity: 0.65;
  padding: 0.25rem;
}

.text-btn:hover,
.text-btn:focus-visible {
  opacity: 1;
}

.custom-input {
  width: 100%;
  border: 2px solid var(--ink);
  background: var(--paper);
  font: inherit;
  font-size: 1.125rem;
  padding: 0.65rem 0.85rem;
  text-align: center;
  color: var(--ink);
  outline: none;
}

.custom-input:focus {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.tick-option {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
  opacity: 0.7;
  cursor: pointer;
  user-select: none;
}

.tick-option input {
  width: 1rem;
  height: 1rem;
  accent-color: var(--ink);
  cursor: pointer;
}

/* Giant button */
.giant-btn {
  width: min(16rem, 70vw);
  aspect-ratio: 1;
  border: 3px solid var(--ink);
  border-radius: 50%;
  background: var(--paper);
  font: inherit;
  font-size: clamp(1.25rem, 4vw, 1.75rem);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: lowercase;
  cursor: pointer;
  color: var(--ink);
  transition: transform 0.15s ease, background 0.15s ease, color 0.15s ease;
  flex-shrink: 0;
}

.giant-btn:hover {
  background: var(--ink);
  color: var(--paper);
}

/* Keep stop readable when ink has filled behind it */
body.is-running .giant-btn,
body.is-running .giant-btn:hover {
  background: var(--paper);
  color: var(--ink);
}

.giant-btn:active {
  transform: scale(0.96);
}

.giant-btn:focus-visible {
  outline: 3px solid var(--ink);
  outline-offset: 4px;
}

/* Running */
.running {
  gap: 2.5rem;
}

.task-display {
  font-size: 1rem;
  text-align: center;
  max-width: 100%;
  word-break: break-word;
  mix-blend-mode: difference;
  color: var(--paper);
  opacity: 0.85;
}

.countdown {
  font-size: clamp(4rem, 18vw, 8rem);
  font-variant-numeric: tabular-nums;
  font-weight: 300;
  letter-spacing: -0.02em;
  line-height: 1;
  mix-blend-mode: difference;
  color: var(--paper);
}

/* Done */
.done {
  position: fixed;
  inset: 0;
  z-index: 2;
  max-width: none;
  justify-content: center;
  background: var(--ink);
}

.again-btn {
  border: none;
  background: none;
  font: inherit;
  font-size: clamp(2rem, 8vw, 4rem);
  font-weight: 300;
  letter-spacing: 0.06em;
  text-transform: lowercase;
  color: var(--paper);
  cursor: pointer;
  padding: 2rem;
  transition: opacity 0.15s ease;
}

.again-btn:hover,
.again-btn:focus-visible {
  opacity: 0.7;
}

.again-btn:focus-visible {
  outline: 2px solid var(--paper);
  outline-offset: 4px;
}

/* High fill: running panel text adapts via blend mode on countdown;
   stop button stays readable on paper until fill overtakes it */
body.is-running .giant-btn {
  position: relative;
  z-index: 1;
}