:root {
  --bg-deep: #1a2218;
  --bg-mid: #24301f;
  --bg-lift: #2e3d28;
  --ink: #f2efe6;
  --ink-muted: rgba(242, 239, 230, 0.62);
  --accent: #e8a045;
  --accent-soft: rgba(232, 160, 69, 0.18);
  --line: rgba(242, 239, 230, 0.12);
  --danger: #d97757;
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "IBM Plex Sans", system-ui, sans-serif;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --radius: 18px;
  --progress: 0;
}

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

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--bg-deep);
  min-height: 100dvh;
  overflow-x: hidden;
  transition: background-color 400ms var(--ease-out);
}

body[data-mode="shortBreak"] {
  --accent: #7eb8a2;
  --accent-soft: rgba(126, 184, 162, 0.18);
}

body[data-mode="longBreak"] {
  --accent: #8aa6d9;
  --accent-soft: rgba(138, 166, 217, 0.18);
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(ellipse 80% 55% at 50% -10%, var(--accent-soft), transparent 60%),
    radial-gradient(ellipse 50% 40% at 85% 90%, rgba(0, 0, 0, 0.35), transparent 55%),
    linear-gradient(165deg, var(--bg-mid) 0%, var(--bg-deep) 55%, #12170f 100%);
  transition: opacity 500ms var(--ease-out);
}

.atmosphere::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

.stage {
  position: relative;
  z-index: 1;
  width: min(720px, calc(100% - 2rem));
  margin: 0 auto;
  padding: clamp(2rem, 6vh, 4rem) 0 clamp(3rem, 8vh, 5rem);
  display: grid;
  gap: clamp(2rem, 5vh, 3.5rem);
}

.brand {
  text-align: center;
}

.brand__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(2.75rem, 8vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 0.95;
}

.brand__tagline {
  margin: 0.65rem 0 0;
  color: var(--ink-muted);
  font-size: 1rem;
  letter-spacing: 0.02em;
}

.timer {
  text-align: center;
  position: relative;
}

.mode-tabs {
  display: inline-flex;
  gap: 0.25rem;
  padding: 0.3rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.18);
  margin-bottom: 1.75rem;
}

.mode-tab {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--ink-muted);
  font: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.55rem 0.95rem;
  border-radius: 999px;
  cursor: pointer;
  transition:
    color 180ms var(--ease-out),
    background-color 180ms var(--ease-out),
    transform 120ms var(--ease-out);
}

.mode-tab:hover {
  color: var(--ink);
}

.mode-tab:active {
  transform: scale(0.97);
}

.mode-tab.is-active {
  background: var(--accent-soft);
  color: var(--ink);
}

.timer__mode {
  margin: 0;
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  transition: color 300ms var(--ease-out);
}

.timer__display {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: center;
  align-items: baseline;
  margin: 0.35rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(4.5rem, 18vw, 8rem);
  font-weight: 500;
  letter-spacing: -0.04em;
  line-height: 1;
  transition: transform 300ms var(--ease-out), color 300ms var(--ease-out);
}

.timer__digit,
.timer__sep {
  display: block;
  flex-shrink: 0;
  text-align: center;
}

.timer__digit {
  width: 1ch;
}

.timer__sep {
  width: 0.4em;
}

.timer__display.is-pulse {
  animation: complete-pulse 700ms var(--ease-out);
}

.timer__ring {
  position: absolute;
  left: 50%;
  top: 58%;
  width: min(420px, 86vw);
  height: min(420px, 86vw);
  transform: translate(-50%, -54%);
  border-radius: 50%;
  pointer-events: none;
  opacity: 0.55;
  background:
    conic-gradient(
      from -90deg,
      var(--accent) calc(var(--progress) * 1turn),
      transparent 0
    );
  mask: radial-gradient(farthest-side, transparent calc(100% - 3px), #000 calc(100% - 2px));
  -webkit-mask: radial-gradient(farthest-side, transparent calc(100% - 3px), #000 calc(100% - 2px));
  transition: opacity 300ms var(--ease-out);
}

.timer__ring-fill {
  display: none;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.65rem;
  margin-top: 1.75rem;
  position: relative;
  z-index: 1;
}

.btn {
  appearance: none;
  border: 1px solid transparent;
  font: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.85rem 1.35rem;
  border-radius: 999px;
  cursor: pointer;
  transition:
    transform 120ms var(--ease-out),
    background-color 180ms var(--ease-out),
    border-color 180ms var(--ease-out),
    color 180ms var(--ease-out);
}

.btn:active {
  transform: scale(0.97);
}

.btn--primary {
  background: var(--accent);
  color: #1a150c;
}

#btn-toggle {
  min-width: 8.5rem;
}

.btn--primary:hover {
  filter: brightness(1.05);
}

.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.04);
}

.btn--block {
  width: 100%;
}

.btn--icon {
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  font-size: 1.4rem;
  line-height: 1;
}

.timer__meta {
  margin: 1.1rem 0 0;
  color: var(--ink-muted);
  font-size: 0.9rem;
  position: relative;
  z-index: 1;
}

.stats {
  border-top: 1px solid var(--line);
  padding-top: 1.75rem;
}

.stats__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.stat__value {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 5vw, 2.25rem);
  letter-spacing: -0.02em;
}

.stat__label {
  margin: 0.2rem 0 0;
  color: var(--ink-muted);
  font-size: 0.85rem;
}

.stats__heading {
  margin: 0 0 0.85rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-muted);
}

.history {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.history__item {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--line);
  animation: rise-in 320ms var(--ease-out) both;
}

.history__kind {
  font-weight: 500;
}

.history__meta,
.history__empty {
  color: var(--ink-muted);
  font-size: 0.9rem;
}

.history__empty {
  padding: 0.4rem 0;
  list-style: none;
}

.settings[hidden] {
  display: none;
}

.settings {
  position: fixed;
  inset: 0;
  z-index: 20;
}

.settings__backdrop {
  position: absolute;
  inset: 0;
  background: rgba(8, 10, 7, 0.62);
  backdrop-filter: blur(4px);
  animation: fade-in 200ms var(--ease-out);
}

.settings__sheet {
  position: absolute;
  left: 50%;
  top: 50%;
  width: min(420px, calc(100% - 1.5rem));
  max-height: min(90dvh, 640px);
  overflow: auto;
  transform: translate(-50%, -50%);
  background: var(--bg-lift);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.25rem 1.5rem;
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.4);
  animation: sheet-in 280ms var(--ease-out);
}

.settings__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.settings__header h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.45rem;
  font-weight: 600;
}

.settings__form {
  display: grid;
  gap: 0.9rem;
}

.field {
  display: grid;
  gap: 0.35rem;
  font-size: 0.9rem;
  color: var(--ink-muted);
}

.field input[type="number"] {
  appearance: textfield;
  width: 100%;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.22);
  color: var(--ink);
  border-radius: 12px;
  padding: 0.75rem 0.85rem;
  font: inherit;
  font-size: 1rem;
}

.field input[type="number"]:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.field--check {
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 0.65rem;
  color: var(--ink);
}

@media (max-width: 520px) {
  .mode-tabs {
    width: 100%;
    justify-content: space-between;
  }

  .mode-tab {
    flex: 1;
    padding-inline: 0.4rem;
    font-size: 0.78rem;
  }

  .controls {
    flex-direction: column;
  }

  .btn {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}

@keyframes complete-pulse {
  0% {
    transform: scale(1);
  }
  35% {
    transform: scale(1.04);
    color: var(--accent);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-in {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes sheet-in {
  from {
    opacity: 0;
    transform: translate(-50%, -46%) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
  }
}