:root {
  color-scheme: light dark;
  --bg: #f4f5f7;
  --card-bg: #ffffff;
  --text: #1a1d23;
  --muted: #6b7280;
  --border: #e3e5e9;
  --accent: #2f6fed;
  --accent-soft: #e8f0ff;
  --running: #1f9d55;
  --running-soft: #e5f8ec;
  --done: #b7791f;
  --done-soft: #fff6e0;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --card-bg: #1e2128;
    --text: #eef0f3;
    --muted: #9aa0ab;
    --border: #2c3038;
    --accent: #5b8def;
    --accent-soft: #23304a;
    --running: #3ecf7e;
    --running-soft: #16301f;
    --done: #f0b429;
    --done-soft: #362a10;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  min-height: 100vh;
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 2rem 0.5rem;
}

.page-header h1 {
  margin: 0;
  font-size: 1.5rem;
}

.status-pill {
  font-size: 0.8rem;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  background: var(--running-soft);
  color: var(--running);
}
.status-pill.offline {
  background: var(--done-soft);
  color: var(--done);
}

.board {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.25rem;
  padding: 1.5rem 2rem 3rem;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
  transition: box-shadow 0.2s ease;
}

.card.running {
  box-shadow: 0 0 0 2px var(--running-soft);
}

.card.done {
  box-shadow: 0 0 0 2px var(--done-soft);
}

.card-name {
  font-size: 1.1rem;
  font-weight: 600;
}

.card-badge {
  align-self: flex-start;
  font-size: 0.75rem;
  padding: 0.15rem 0.6rem;
  border-radius: 999px;
  background: var(--border);
  color: var(--muted);
}
.card.running .card-badge {
  background: var(--running-soft);
  color: var(--running);
}
.card.done .card-badge {
  background: var(--done-soft);
  color: var(--done);
}

.timer {
  font-size: 2.1rem;
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.progress-track {
  height: 8px;
  border-radius: 999px;
  background: var(--border);
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--accent);
  width: 0%;
  transition: width 1s linear;
}
.card.done .progress-fill {
  background: var(--done);
}

.card-actions {
  display: flex;
  gap: 0.6rem;
}

button {
  font: inherit;
  border: none;
  border-radius: 10px;
  padding: 0.55rem 1rem;
  cursor: pointer;
  font-weight: 600;
}

.btn-start {
  background: var(--accent);
  color: white;
  flex: 1;
}
.btn-start:disabled {
  background: var(--border);
  color: var(--muted);
  cursor: not-allowed;
}

.btn-reset {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
}

.card.done .card-name::after {
  content: " 🎉";
}

#confetti-layer {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 999;
}

.confetti-piece {
  position: absolute;
  top: -10px;
  width: 8px;
  height: 14px;
  opacity: 0.9;
  animation: confetti-fall linear forwards;
}

@keyframes confetti-fall {
  to {
    transform: translateY(105vh) rotate(540deg);
    opacity: 0.4;
  }
}