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

:root {
  --bg:     #0d0d0d;
  --text:   #dedad4;
  --muted:  rgba(222, 218, 212, 0.40);
  --dimmer: rgba(222, 218, 212, 0.18);
  --glow:   rgba(222, 218, 212, 0.055);
  --font:   'Inter', 'Helvetica Neue', Helvetica, Arial, sans-serif;
}

html {
  background: var(--bg);
  scroll-behavior: smooth;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  font-family: var(--font);
  font-weight: 300;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

header {
  width: 100%;
  padding: 2.8rem 5vw 1.8rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  text-decoration: none;
  color: var(--text);
}

.brand__logo {
  flex-shrink: 0;
  width: 128px;
  height: auto;
  opacity: 0.92;
}

.brand__name {
  font-size: clamp(1rem, 2vw, 1.35rem);
  font-weight: 300;
  letter-spacing: 0.06em;
  line-height: 1;
  color: var(--text);
}

.tagline {
  font-size: clamp(0.6875rem, 1.3vw, 0.8125rem);
  font-weight: 300;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--muted);
}

main {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  padding: 3.75rem 5vw 6vh;
}

.control-message {
  width: 100%;
  margin-bottom: 1.25rem;
  text-align: center;
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* Grid keeps timer centered; modes sit further left in the left column */
.timer-layout {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  width: min(100%, 56rem);
  margin: 0 auto;
}

.timer-block {
  grid-column: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
}

.nudge {
  font-size: clamp(0.75rem, 1.5vw, 0.9rem);
  letter-spacing: 0.12em;
  text-transform: lowercase;
  color: var(--muted);
  text-align: center;
  max-width: 14rem;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.35s ease, transform 0.35s ease;
}

.nudge.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.timer {
  font-size: clamp(4.5rem, 18vw, 9rem);
  font-weight: 200;
  letter-spacing: 0.04em;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--text);
  transition: color 0.35s ease;
}

.timer--overtime,
body.is-overtime .timer {
  color: var(--muted);
}

.sessions {
  font-size: clamp(0.75rem, 1.4vw, 0.875rem);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--dimmer);
}

.focused-today {
  margin-top: 0.35rem;
  text-transform: none;
  letter-spacing: 0.1em;
}

.controls {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: clamp(2rem, 8vw, 6rem);
  width: 100%;
  max-width: 36rem;
}

.control-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 0.85rem;
  border: 1px solid transparent;
  border-radius: 6px;
  background: none;
  font: inherit;
  font-weight: 300;
  font-size: clamp(0.875rem, 1.8vw, 1rem);
  letter-spacing: 0.2em;
  text-transform: lowercase;
  color: var(--dimmer);
  line-height: 1;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
}

.control-btn:hover {
  color: var(--muted);
}

.control-btn.is-active {
  color: var(--text);
  /* border-color: rgba(222, 218, 212, 0.28); */
  /* background: var(--glow); */
  /* box-shadow: 0 0 20px var(--glow); */
}

.control-btn:focus-visible {
  outline: 1px solid var(--dimmer);
  outline-offset: 0.35rem;
}

.modes {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.65rem;
}

.modes--left {
  grid-column: 1;
  justify-self: start;
  margin-left: clamp(-4rem, -6vw, -1.5rem);
  padding-right: clamp(1.5rem, 4vw, 3rem);
}

.modes--right {
  grid-column: 3;
  justify-self: end;
  margin-right: clamp(-4rem, -6vw, -1.5rem);
  padding-left: clamp(1.5rem, 4vw, 3rem);
}

.modes-btn {
  display: inline-flex;
  align-items: center;
  justify-content: flex-start;
  min-width: 8.5rem;
  padding: 0.6rem 1rem;
  border: 1px solid transparent;
  border-radius: 6px;
  background: none;
  font: inherit;
  font-weight: 300;
  font-size: clamp(0.75rem, 1.4vw, 0.875rem);
  letter-spacing: 0.14em;
  text-transform: lowercase;
  color: var(--dimmer);
  line-height: 1;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease, box-shadow 0.2s ease;
  white-space: nowrap;
}

.modes-btn:hover {
  color: var(--muted);
}

.modes-btn.is-active {
  color: var(--text);
  /* border-color: rgba(222, 218, 212, 0.35); */
  background: var(--glow);
  box-shadow: 0 0 24px var(--glow);
}

.modes-btn:focus-visible {
  outline: 1px solid var(--dimmer);
  outline-offset: 0.35rem;
}

.task {
  width: 100%;
  max-width: 22rem;
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.task-form {
  width: 100%;
}

.task-input {
  width: 100%;
  padding: 0.65rem 0;
  border: none;
  border-bottom: 1px solid var(--dimmer);
  background: transparent;
  font: inherit;
  font-weight: 300;
  font-size: clamp(0.875rem, 1.6vw, 1rem);
  letter-spacing: 0.06em;
  color: var(--text);
  text-align: center;
  outline: none;
  transition: border-color 0.2s ease;
}

.task-input::placeholder {
  color: var(--dimmer);
  text-transform: lowercase;
}

.task-input:focus {
  border-bottom-color: var(--muted);
}

.task-active {
  width: 100%;
  transition: opacity 0.32s ease, transform 0.32s ease;
}

.task-active.is-removing {
  opacity: 0;
  transform: translateY(-6px);
  pointer-events: none;
}

.task-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.85rem;
  cursor: pointer;
  width: 100%;
}

.task-check {
  flex-shrink: 0;
  width: 1rem;
  height: 1rem;
  margin: 0;
  accent-color: var(--text);
  cursor: pointer;
}

.task-text {
  position: relative;
  display: inline-block;
  font-size: clamp(0.875rem, 1.6vw, 1rem);
  letter-spacing: 0.06em;
  color: var(--text);
  line-height: 1.4;
  transition: color 0.22s ease;
}

.task-text::after {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: translateY(-50%) scaleX(0);
  transform-origin: left center;
  transition: transform 0.28s ease-out;
  pointer-events: none;
}

.task-text.is-crossing {
  color: var(--muted);
}

.task-text.is-crossing::after {
  transform: translateY(-50%) scaleX(1);
}