:root {
  --background: #d3efd6;
  --panel: rgba(232, 245, 231, 0.8);
  --paper: rgba(247, 252, 246, 0.94);
  --ink: #193126;
  --muted: #587061;
  --strong-line: #2d4d3d;
  --grid-line: rgba(55, 90, 71, 0.28);
  --panel-line: rgba(55, 90, 71, 0.15);
  --accent: #4d8b67;
  --accent-deep: #2f6146;
  --shadow: 0 22px 60px rgba(44, 77, 56, 0.12);
  --radius: 8px;
  --exercise-display-size: clamp(2.9rem, 5.4vw, 6.2rem);
  --timer-display-size: clamp(4.35rem, 8.1vw, 9.3rem);
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

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

body {
  margin: 0;
  background: var(--background);
  color: var(--ink);
  font-family: "IBM Plex Sans", sans-serif;
}

.app-shell {
  position: relative;
  max-width: 1320px;
  margin: 0 auto;
  padding: 40px 24px;
}

.topbar {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--grid-line);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-family: "IBM Plex Serif", serif;
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 600;
  line-height: 1.02;
}

.controls {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.button {
  border: 1px solid var(--panel-line);
  background: rgba(247, 252, 246, 0.72);
  color: var(--ink);
  padding: 12px 18px;
  border-radius: var(--radius);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  transition:
    transform 160ms ease,
    background-color 160ms ease,
    border-color 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
  border-color: rgba(55, 90, 71, 0.3);
  background: rgba(247, 252, 246, 0.9);
}

.button-primary {
  background: var(--accent-deep);
  border-color: var(--accent-deep);
  color: #f5fbf4;
}

.button-primary:hover {
  background: #274f39;
  border-color: #274f39;
}

.button-glyph {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 3.2rem;
  padding-inline: 0.9rem;
  font-size: 1rem;
  line-height: 1;
}

.button-icon {
  display: inline-flex;
  width: 1.95rem;
  height: 1.25rem;
}

.button-icon svg {
  width: 100%;
  height: 100%;
  fill: currentColor;
}

.main-panel {
  margin-top: 28px;
  padding: clamp(24px, 4vw, 48px);
  background: var(--paper);
  border: 1px solid var(--panel-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.minute-label,
.exercise-label,
.next-label,
.footer {
  color: var(--muted);
}

.minute-label {
  margin: 0 0 16px;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.timer {
  font-family: "IBM Plex Mono", monospace;
  font-size: var(--timer-display-size);
  font-weight: 500;
  line-height: 0.9;
  letter-spacing: -0.05em;
}

.exercise-block {
  margin-top: 28px;
  display: grid;
  gap: 14px;
}

.exercise-line {
  display: flex;
  align-items: flex-start;
  gap: clamp(16px, 2vw, 28px);
}

.exercise-label {
  margin: 0;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.exercise-name {
  font-family: "IBM Plex Mono", monospace;
  flex: 1 1 auto;
  min-width: 0;
  font-size: var(--exercise-display-size);
  font-weight: 500;
  line-height: 0.9;
  letter-spacing: -0.05em;
  white-space: nowrap;
}

.exercise-name.is-complete {
  white-space: normal;
}

.next-exercise {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  align-self: flex-start;
  gap: 12px;
  flex: 0 0 min(18rem, 28vw);
  margin-top: 0.45rem;
  padding: 18px 20px;
  border-radius: var(--radius);
  border: 1px solid rgba(47, 97, 70, 0.22);
  background: rgba(77, 139, 103, 0.1);
  opacity: 0;
  transition:
    opacity 220ms ease,
    background-color 220ms ease,
    border-color 220ms ease;
}

.next-label {
  font-size: 0.8rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.next-name {
  font-size: clamp(1.2rem, 2.2vw, 1.9rem);
  font-weight: 600;
  color: var(--accent-deep);
}

.next-exercise.is-visible {
  opacity: 1;
}

.next-exercise.is-pulsing {
  animation: pulseCue 1.4s ease-in-out infinite;
}

.sequence {
  margin-top: 28px;
}

.sequence-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 8px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.sequence-list li {
  display: grid;
  gap: 4px;
  padding: 12px 14px;
  border: 1px solid transparent;
  border-top-color: var(--panel-line);
  border-radius: var(--radius);
  color: var(--muted);
  transition:
    background-color 180ms ease,
    border-color 180ms ease,
    color 180ms ease;
}

.sequence-role {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.sequence-list li strong {
  color: var(--ink);
  font-family: "IBM Plex Serif", serif;
  font-size: 1.15rem;
  font-weight: 500;
}

.sequence-list li.is-current {
  background: rgba(47, 97, 70, 0.2);
  border-color: rgba(47, 97, 70, 0.46);
}

.sequence-list li.is-current strong,
.sequence-list li.is-current .sequence-role,
.sequence-list li.is-current {
  color: var(--accent-deep);
}

.sequence-list li.is-next {
  background: rgba(225, 243, 229, 0.92);
  border-color: rgba(77, 139, 103, 0.32);
}

.sequence-list li.is-next strong,
.sequence-list li.is-next .sequence-role,
.sequence-list li.is-next {
  color: #476b58;
}

.footer {
  margin-top: 40px;
  text-align: center;
  font-size: 0.92rem;
}

.footer a {
  color: var(--accent-deep);
  text-decoration-color: rgba(47, 97, 70, 0.28);
  text-underline-offset: 0.16em;
}

.footer a:hover {
  text-decoration-color: currentColor;
}

@keyframes pulseCue {
  0%,
  100% {
    background: rgba(77, 139, 103, 0.08);
    border-color: rgba(47, 97, 70, 0.18);
    box-shadow: none;
  }

  50%,
  60% {
    background: rgba(77, 139, 103, 0.28);
    border-color: rgba(47, 97, 70, 0.36);
    box-shadow: 0 0 0 10px rgba(77, 139, 103, 0.1);
  }
}

@media (orientation: portrait) {
  .exercise-line {
    flex-direction: column;
    align-items: start;
  }

  .next-exercise {
    flex-basis: auto;
    width: 100%;
    margin-top: 0;
  }
}

@media (max-width: 760px) {
  .app-shell {
    padding: 28px 18px 48px;
  }

  .topbar {
    align-items: start;
    flex-direction: column;
  }

  .controls {
    width: 100%;
  }

  .button {
    flex: 1 1 160px;
  }

  .main-panel {
    padding: 24px 20px;
  }

  .timer {
    letter-spacing: -0.04em;
  }

  .next-exercise {
    gap: 6px;
  }
}