:root {
  --bg: #0f1115;
  --card-bg: #1a1d24;
  --border: #2a2e37;
  --text: #e8e9ec;
  --text-dim: #8b8f9a;
  --accent: #22c55e;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f6f8;
    --card-bg: #ffffff;
    --border: #e2e4e9;
    --text: #1a1d24;
    --text-dim: #6b7080;
  }
}

* { box-sizing: border-box; }

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

.app {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 20px 80px;
}

header h1 {
  font-size: 28px;
  margin: 0 0 4px;
}

.subtitle {
  color: var(--text-dim);
  margin: 0 0 28px;
  text-transform: capitalize;
}

.add-form {
  display: flex;
  gap: 8px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.add-form input[type="text"] {
  flex: 1;
  min-width: 180px;
  padding: 10px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  font-size: 14px;
}

.add-form select {
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  font-size: 14px;
}

.add-form button {
  padding: 10px 18px;
  border-radius: 10px;
  border: none;
  background: var(--accent);
  color: #05130a;
  font-weight: 600;
  cursor: pointer;
  font-size: 14px;
}

.add-form button:hover { filter: brightness(1.08); }

.habit-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.habit-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
}

.habit-top {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.check-btn {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: transparent;
  cursor: pointer;
  flex-shrink: 0;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
}

.check-btn:hover { border-color: var(--accent); }

.check-btn.done {
  color: white;
}

.habit-info { flex: 1; min-width: 0; }

.habit-name {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.streak-label {
  font-size: 13px;
  color: var(--text-dim);
}

.delete-btn {
  border: none;
  background: transparent;
  color: var(--text-dim);
  cursor: pointer;
  font-size: 14px;
  padding: 6px;
  border-radius: 6px;
  flex-shrink: 0;
}

.delete-btn:hover {
  background: rgba(239,68,68,0.15);
  color: #ef4444;
}

.heatmap {
  display: grid;
  grid-template-rows: repeat(7, 1fr);
  grid-auto-flow: column;
  gap: 3px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.day-cell {
  width: 11px;
  height: 11px;
  border-radius: 3px;
  background: var(--border);
  flex-shrink: 0;
}

.day-cell.future {
  background: transparent;
}

.empty-state {
  text-align: center;
  color: var(--text-dim);
  margin-top: 40px;
  display: none;
}

.empty-state.visible { display: block; }

.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.tab-btn {
  padding: 10px 4px;
  margin-bottom: -1px;
  border: none;
  border-bottom: 2px solid transparent;
  background: transparent;
  color: var(--text-dim);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.tab-btn.active {
  color: var(--text);
  border-bottom-color: var(--accent);
}

.tab-panel { display: none; }
.tab-panel.active { display: block; }

.workflow-progress {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.progress-bar {
  flex: 1;
  height: 8px;
  border-radius: 999px;
  background: var(--border);
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 999px;
  transition: width 0.2s ease;
}

#progress-label {
  font-size: 13px;
  color: var(--text-dim);
  white-space: nowrap;
}

.reset-btn {
  display: block;
  margin-bottom: 20px;
  padding: 8px 14px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--card-bg);
  color: var(--text);
  font-size: 13px;
  cursor: pointer;
}

.reset-btn:hover { border-color: var(--accent); }

.workflow-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.step-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 16px;
}

.step-card.done { border-color: var(--accent); }

.step-top {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 12px;
}

.step-check {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  border: 2px solid var(--border);
  background: transparent;
  cursor: pointer;
  flex-shrink: 0;
  font-size: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  margin-top: 2px;
}

.step-check:hover { border-color: var(--accent); }

.step-check.done {
  background: var(--accent);
  border-color: var(--accent);
}

.step-info { flex: 1; min-width: 0; }

.step-name {
  margin: 0 0 2px;
  font-size: 15px;
  font-weight: 600;
}

.step-desc {
  margin: 0;
  font-size: 13px;
  color: var(--text-dim);
}

.step-fields {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}

.step-fields label {
  flex: 1;
  min-width: 160px;
  font-size: 12px;
  color: var(--text-dim);
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.step-fields input {
  padding: 8px 10px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 13px;
}

.step-suggested {
  margin: 0;
  font-size: 12px;
  color: var(--text-dim);
  font-style: italic;
}