:root {
  color-scheme: light dark;
  --bg: #101019;
  --card: #1a1b2b;
  --text: #f5f5ff;
  --muted: #a4a7be;
  --accent: #7a8bff;
  --accent-strong: #5e72ff;
  --danger: #ff6d6d;
  --success: #8cd67f;
  --border: #2f3352;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: radial-gradient(circle at top, #23284b 0%, var(--bg) 55%);
  color: var(--text);
  display: grid;
  place-items: center;
  padding: 16px;
}

.app {
  width: min(640px, 100%);
  background: color-mix(in oklab, var(--card), black 5%);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.25);
}

.app-header h1 {
  margin: 0;
  font-size: clamp(1.4rem, 4vw, 2rem);
}

.app-header p {
  margin-top: 6px;
  color: var(--muted);
}

.mode-switcher {
  margin: 18px 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.mode-btn {
  border: 1px solid var(--border);
  background: #262a45;
  color: var(--text);
  border-radius: 10px;
  padding: 10px 12px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.mode-btn:hover {
  background: #31375f;
}

.mode-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.timer-panel {
  margin: 8px 0 14px;
  text-align: center;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 16px;
}

.session-label {
  margin: 0;
  color: var(--muted);
}

.timer-display {
  margin: 8px 0;
  font-size: clamp(2.3rem, 11vw, 4.2rem);
  letter-spacing: 1px;
  font-variant-numeric: tabular-nums;
}

.cycle-text {
  margin: 0;
  color: var(--muted);
}

.controls {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.control-btn {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #2a2f4f;
  color: var(--text);
  font-size: 0.95rem;
  padding: 11px 12px;
  cursor: pointer;
}

.control-btn:hover {
  filter: brightness(1.06);
}

.control-btn.primary {
  background: var(--accent-strong);
  border-color: var(--accent-strong);
}

.control-btn.save {
  margin-top: 12px;
  width: 100%;
  background: #2f5d47;
  border-color: #387055;
}

.settings {
  margin-top: 18px;
  border-top: 1px solid var(--border);
  padding-top: 16px;
}

.settings h2 {
  margin: 0 0 10px;
  font-size: 1.1rem;
}

.field-grid {
  display: grid;
  gap: 9px 12px;
  grid-template-columns: 1fr auto;
  align-items: center;
}

.field-grid label {
  color: var(--muted);
}

.field-grid input {
  width: 100px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #20243d;
  color: var(--text);
  padding: 8px 10px;
}

.status {
  min-height: 1.2em;
  margin: 14px 0 0;
  color: var(--success);
}

.status.error {
  color: var(--danger);
}

@media (max-width: 500px) {
  .controls {
    grid-template-columns: 1fr;
  }

  .field-grid {
    grid-template-columns: 1fr;
  }

  .field-grid input {
    width: 100%;
  }
}