:root {
  --bg: #0d0f12;
  --surface: #161a1f;
  --border: #2a3038;
  --text: #e6e9ef;
  --text-muted: #8b919e;
  --work-bg: #2d1a0f;
  --work-accent: #f59e0b;
  --work-glow: rgba(245, 158, 11, 0.25);
  --rest-bg: #0a1f1f;
  --rest-accent: #14b8a6;
  --rest-glow: rgba(20, 184, 166, 0.25);
  --ready-bg: var(--surface);
  --ready-accent: var(--text-muted);
  --primary: #f59e0b;
  --primary-hover: #fbbf24;
  --radius: 12px;
  --radius-sm: 8px;
}

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Outfit", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.app {
  width: 100%;
  max-width: 420px;
}

.header {
  text-align: center;
  margin-bottom: 2rem;
}

.header h1 {
  margin: 0;
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.tagline {
  margin: 0.35rem 0 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.main {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
}

.mode-toggle {
  display: inline-flex;
  padding: 0.15rem;
  border-radius: 999px;
  background: #0b0d10;
  border: 1px solid var(--border);
  margin-bottom: 1.25rem;
}

.mode-tab {
  flex: 1;
  min-width: 120px;
  padding: 0.5rem 0.9rem;
  border-radius: 999px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  cursor: pointer;
  transition: background 0.2s, color 0.2s, transform 0.1s;
}

.mode-tab.mode-tab-active {
  background: var(--primary);
  color: var(--bg);
  transform: translateY(-1px);
}

.config {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
}

.config-mode-simple {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.config-mode-advanced {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.config-row {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.config-row.full-width {
  grid-column: 1 / -1;
}

.config-row label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.config-row .unit {
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
}

.config-row input {
  font-family: "JetBrains Mono", monospace;
  font-size: 1rem;
  padding: 0.6rem 0.5rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  -moz-appearance: textfield;
}

.config-row input::-webkit-outer-spin-button,
.config-row input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.config-row input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(245, 158, 11, 0.2);
}

.display {
  text-align: center;
  padding: 1.5rem;
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
  transition: background 0.35s ease, box-shadow 0.35s ease;
}

.display.phase-work {
  background: var(--work-bg);
  box-shadow: 0 0 0 1px rgba(245, 158, 11, 0.2), 0 0 40px var(--work-glow);
}

.display.phase-rest {
  background: var(--rest-bg);
  box-shadow: 0 0 0 1px rgba(20, 184, 166, 0.2), 0 0 40px var(--rest-glow);
}

.display.phase-ready {
  background: var(--ready-bg);
  box-shadow: none;
}

.phase-badge {
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.5rem;
  transition: color 0.35s ease;
}

.phase-ready .phase-badge {
  color: var(--ready-accent);
}

.phase-work .phase-badge {
  color: var(--work-accent);
}

.phase-rest .phase-badge {
  color: var(--rest-accent);
}

.time {
  font-family: "JetBrains Mono", monospace;
  font-size: 3.5rem;
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.phase-ready .time {
  color: var(--text);
}

.phase-work .time {
  color: var(--work-accent);
}

.phase-rest .time {
  color: var(--rest-accent);
}

.rounds-display {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: 0.5rem;
}

.rounds-display span {
  font-weight: 600;
  color: var(--text);
}

.controls {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.sound-toggle {
  display: flex;
  justify-content: center;
  margin-bottom: 1rem;
}

.toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  cursor: pointer;
  user-select: none;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.toggle input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.toggle-track {
  width: 40px;
  height: 22px;
  border-radius: 999px;
  background: #11151b;
  border: 1px solid var(--border);
  display: inline-flex;
  align-items: center;
  padding: 2px;
  box-sizing: border-box;
  transition: background 0.2s, border-color 0.2s;
}

.toggle-thumb {
  width: 16px;
  height: 16px;
  border-radius: 999px;
  background: var(--text-muted);
  transform: translateX(0);
  transition: transform 0.2s, background 0.2s;
}

.toggle-label {
  color: var(--text-muted);
}

.toggle input:checked + .toggle-track {
  background: var(--primary);
  border-color: var(--primary);
}

.toggle input:checked + .toggle-track .toggle-thumb {
  transform: translateX(16px);
  background: #11151b;
}

.toggle input:checked ~ .toggle-label {
  color: var(--text);
}

.btn {
  flex: 1;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  padding: 0.85rem 1rem;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

.btn:active {
  transform: scale(0.98);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
}

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

.btn-primary:hover:not(:disabled) {
  background: var(--primary-hover);
}

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

.btn-secondary:hover:not(:disabled) {
  background: #363d47;
}

.hint {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
  margin: 0;
}

.sets-grid {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.set-row {
  display: grid;
  grid-template-columns: minmax(0, 0.6fr) repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
  align-items: center;
}

.set-row-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.set-row input {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.9rem;
  padding: 0.5rem 0.5rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
}

.set-row input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 2px rgba(245, 158, 11, 0.2);
}

@media (max-width: 380px) {
  .config-mode-simple {
    grid-template-columns: 1fr;
  }

  .time {
    font-size: 2.75rem;
  }
}