:root {
  --bg: #0f1115;
  --surface: #1a1d24;
  --surface-2: #22262f;
  --text: #f4f5f7;
  --text-dim: #9aa0ab;
  --accent: #ff5a3c;
  --accent-2: #34d399;
  --rest: #3b82f6;
  --danger: #ef4444;
  --ring-track: #2a2e38;
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, sans-serif;
  overscroll-behavior-y: contain;
}

.app {
  min-height: 100vh;
  min-height: 100dvh;
  padding: env(safe-area-inset-top) 20px calc(env(safe-area-inset-bottom) + 20px);
  display: flex;
  flex-direction: column;
  align-items: center;
}

main {
  width: 100%;
  max-width: 420px;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 28px;
}

.exercise-name {
  font-size: clamp(32px, 10.5vw, 48px);
  font-weight: 800;
  text-align: center;
  line-height: 1.15;
  letter-spacing: -0.3px;
  margin: 4px 10px 10px;
  max-width: 400px;
  word-break: break-word;
  transition: color 0.2s ease;
}

.phase-label {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 18px;
  transition: color 0.2s ease;
}

.phase-label.work { color: var(--accent); }
.phase-label.rest { color: var(--rest); }
.phase-label.prep { color: var(--accent-2); }
.phase-label.done { color: var(--accent-2); }

.exercise-name.work { color: var(--accent); }
.exercise-name.rest { color: var(--rest); }
.exercise-name.prep { color: var(--accent-2); }
.exercise-name.done { color: var(--accent-2); }

.ring-wrap {
  position: relative;
  width: min(72vw, 280px);
  height: min(72vw, 280px);
  margin-bottom: 20px;
}

.ring { width: 100%; height: 100%; transform: rotate(-90deg); }

.ring-bg {
  fill: none;
  stroke: var(--ring-track);
  stroke-width: 10;
}

.ring-progress {
  fill: none;
  stroke: var(--accent);
  stroke-width: 10;
  stroke-linecap: round;
  stroke-dasharray: 565.48;
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 0.25s linear, stroke 0.2s ease;
}

.time-display {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(40px, 12vw, 56px);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 1px;
}

.round-boxes {
  display: grid;
  grid-template-columns: repeat(6, 22px);
  gap: 8px;
  justify-content: center;
  margin: 0 auto 24px;
}

.round-box {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: var(--surface-2);
  border: 2px solid transparent;
  transition: background-color 0.25s ease, border-color 0.25s ease, transform 0.15s ease;
}

.round-box.current {
  border-color: var(--accent);
  transform: scale(1.08);
}

.round-box.done {
  background: var(--accent-2);
  border-color: var(--accent-2);
}

.controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  width: 100%;
  margin-bottom: 28px;
}

.btn {
  border: none;
  border-radius: 14px;
  padding: 16px 20px;
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  color: var(--text);
  background: var(--surface-2);
  transition: transform 0.08s ease, opacity 0.15s ease;
}

.btn:active { transform: scale(0.96); opacity: 0.85; }

.btn.primary {
  background: var(--accent);
  color: #1a0d08;
  flex: 1.3;
  padding: 16px 24px;
}

.btn.secondary { flex: 1; }

.settings {
  width: 100%;
  max-width: 420px;
  background: var(--surface);
  border-radius: 16px;
  padding: 16px 18px 6px;
  margin-top: 4px;
}

.settings h2 {
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-dim);
  margin: 0 0 10px;
  font-weight: 600;
}

.setting-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid var(--surface-2);
}

.setting-row:last-child { border-bottom: none; }

.setting-row label { font-size: 15px; color: var(--text); }

.setting-row input {
  width: 72px;
  text-align: right;
  font-size: 16px;
  color: var(--text);
  background: var(--surface-2);
  border: none;
  border-radius: 8px;
  padding: 8px 10px;
  font-variant-numeric: tabular-nums;
}

.names-section {
  margin-top: 14px;
}

.name-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid var(--surface-2);
}

.name-row:last-child { border-bottom: none; }

.name-row .name-index {
  flex: 0 0 auto;
  width: 26px;
  font-size: 13px;
  color: var(--text-dim);
  font-variant-numeric: tabular-nums;
}

.name-row input[type="text"] {
  flex: 1;
  font-size: 15px;
  color: var(--text);
  background: var(--surface-2);
  border: none;
  border-radius: 8px;
  padding: 9px 11px;
}

.name-row input[type="text"]::placeholder {
  color: var(--text-dim);
}

.restore-btn {
  width: 100%;
  margin: 14px 0 12px;
  font-size: 14px;
  padding: 12px 16px;
}

.hint {
  font-size: 12px;
  color: var(--text-dim);
  text-align: center;
  max-width: 380px;
  margin: 14px 0 4px;
}

@media (min-width: 480px) {
  .btn { font-size: 17px; }
}