:root {
  --color-bg: #14161c;
  --color-surface: #1f232c;
  --color-surface-raised: #2a2f3a;
  --color-text: #f2f3f5;
  --color-text-muted: #9aa1ac;
  --color-primary: #4f8cff;
  --color-primary-text: #ffffff;
  --color-danger: #ff5d5d;
  --color-accent: #45d19a;
  --color-break: #ffb454;
  --gap: 1rem;
  --radius: 14px;
  --font-huge: clamp(4rem, 22vw, 10rem);
}

* {
  box-sizing: border-box;
}

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

body {
  background: var(--color-bg);
  color: var(--color-text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  padding-top: env(safe-area-inset-top);
  padding-bottom: env(safe-area-inset-bottom);
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

h1 {
  font-size: 1.4rem;
  margin: 0;
}

main {
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.screen {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: var(--gap);
  gap: var(--gap);
}

.screen[hidden] {
  display: none;
}

.screen-header {
  display: flex;
  align-items: center;
  gap: var(--gap);
}

button {
  font: inherit;
  color: inherit;
}

.btn {
  border: none;
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  min-height: 56px;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  touch-action: manipulation;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-primary-text);
}

.btn-secondary {
  background: var(--color-surface-raised);
  color: var(--color-text);
}

.btn-danger {
  background: var(--color-danger);
  color: #2a0a0a;
}

.btn-icon {
  background: transparent;
  min-height: 48px;
  min-width: 48px;
  padding: 0.5rem;
  font-size: 1.4rem;
}

.btn-fab {
  position: sticky;
  bottom: var(--gap);
  width: 100%;
}

.exercise-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  flex: 1;
  overflow-y: auto;
}

.exercise-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: var(--gap);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.exercise-card-main {
  flex: 1;
  min-width: 0;
  background: none;
  border: none;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  min-height: 56px;
  justify-content: center;
}

.exercise-card-name {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.exercise-card-summary {
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.exercise-card-actions {
  display: flex;
  gap: 0.4rem;
}

.empty-state {
  color: var(--color-text-muted);
  text-align: center;
  margin-top: 2rem;
}

.exercise-form {
  display: flex;
  flex-direction: column;
  gap: var(--gap);
}

.exercise-form label {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  font-size: 0.95rem;
  color: var(--color-text-muted);
}

.exercise-form label[hidden] {
  display: none;
}

.exercise-form input {
  background: var(--color-surface);
  border: 1px solid var(--color-surface-raised);
  border-radius: var(--radius);
  padding: 0.9rem 1rem;
  font-size: 1.1rem;
  color: var(--color-text);
  min-height: 56px;
}

.form-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: auto;
}

.form-actions .btn {
  flex: 1;
}

/* Timer screen */

#screen-timer {
  padding: 0;
  justify-content: space-between;
}

.timer-progress {
  height: 8px;
  background: var(--color-surface);
}

.timer-progress-bar {
  height: 100%;
  width: 100%;
  background: var(--color-primary);
  transform-origin: left;
  transition: transform 0.1s linear, background-color 0.2s ease;
}

.timer-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: var(--gap);
  text-align: center;
}

.timer-exercise-name {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  margin: 0;
}

.timer-phase-label {
  font-size: 1.6rem;
  font-weight: 700;
  margin: 0;
  letter-spacing: 0.02em;
}

.timer-count {
  font-size: var(--font-huge);
  font-weight: 800;
  font-variant-numeric: tabular-nums;
  margin: 0.2em 0;
  line-height: 1;
}

.timer-rep-progress {
  color: var(--color-text-muted);
  font-size: 1.1rem;
  margin: 0;
}

.timer-controls {
  display: flex;
  gap: 0.75rem;
  padding: var(--gap);
}

.timer-controls .btn {
  flex: 1;
}

.phase-ready .timer-progress-bar { background: var(--color-text-muted); }
.phase-hold .timer-progress-bar { background: var(--color-primary); }
.phase-rest .timer-progress-bar { background: var(--color-accent); }
.phase-setBreak .timer-progress-bar { background: var(--color-break); }
.phase-done .timer-progress-bar { background: var(--color-accent); }

.phase-setBreak .timer-phase-label {
  color: var(--color-break);
}

.phase-done .timer-count,
.phase-done .timer-phase-label {
  color: var(--color-accent);
}