:root {
  --navy: #1f2933;
  --bg: #f4f5f7;
  --card: #ffffff;
  --border: #e1e4e8;
  --text: #1f2933;
  --muted: #616e7c;
  --q1: #d64545;
  --q2: #d99a2b;
  --q3: #2f6fb0;
  --q4: #6b7280;
  --accent: #1f2933;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

.app-header {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 14px 20px;
  background: var(--navy);
  color: #fff;
  flex-wrap: wrap;
}

.app-header h1 {
  font-size: 20px;
  margin: 0;
  font-weight: 600;
}

.tabs {
  display: flex;
  gap: 4px;
  flex: 1;
}

.tab {
  background: transparent;
  border: none;
  color: #cbd2d9;
  padding: 8px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
}

.tab.active {
  background: rgba(255,255,255,0.12);
  color: #fff;
}

.btn-primary {
  background: #3d84e2;
  color: #fff;
  border: none;
  padding: 8px 16px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 600;
}

.btn-primary:hover { background: #2f6fb0; }

main#app {
  max-width: 960px;
  margin: 0 auto;
  padding: 20px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  margin-bottom: 16px;
}

.card h2 {
  margin: 0 0 12px 0;
  font-size: 16px;
}

.quadrant-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

@media (max-width: 640px) {
  .quadrant-grid { grid-template-columns: 1fr; }
}

.quadrant {
  border-radius: 10px;
  padding: 14px;
  border: 1px solid var(--border);
  background: var(--card);
}

.quadrant h3 {
  margin: 0 0 10px 0;
  font-size: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.q-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  display: inline-block;
}

.q1 .q-dot, .badge-q1 { background: var(--q1); }
.q2 .q-dot, .badge-q2 { background: var(--q2); }
.q3 .q-dot, .badge-q3 { background: var(--q3); }
.q4 .q-dot, .badge-q4 { background: var(--q4); }

.quadrant.q1 { border-left: 4px solid var(--q1); }
.quadrant.q2 { border-left: 4px solid var(--q2); }
.quadrant.q3 { border-left: 4px solid var(--q3); }
.quadrant.q4 { border-left: 4px solid var(--q4); }

.task-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
}

.task-item:last-child { border-bottom: none; }

.task-item.completed .task-title {
  text-decoration: line-through;
  color: var(--muted);
}

.task-title { font-size: 14px; font-weight: 500; }
.task-meta { font-size: 12px; color: var(--muted); margin-top: 2px; }

.task-actions { margin-left: auto; display: flex; gap: 6px; }

.icon-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--muted);
  font-size: 13px;
  padding: 2px 6px;
}

.icon-btn:hover { color: var(--text); }

.empty-state {
  color: var(--muted);
  font-size: 13px;
  padding: 8px 0;
}

textarea, input[type="text"], input[type="datetime-local"], input[type="number"], select {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 14px;
  font-family: inherit;
}

.form-row {
  display: flex;
  gap: 12px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}

.form-row > div { flex: 1; min-width: 160px; }

.form-row label {
  display: block;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 4px;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
}

.form-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
  margin-top: 10px;
}

.btn-secondary {
  background: #fff;
  border: 1px solid var(--border);
  padding: 8px 14px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
}

.diary-entry {
  border-bottom: 1px solid var(--border);
  padding: 10px 0;
}

.diary-date {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 4px;
}

.toast {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--navy);
  color: #fff;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 13px;
  box-shadow: 0 4px 14px rgba(0,0,0,0.2);
  transition: opacity 0.2s ease;
}

.toast.hidden { opacity: 0; pointer-events: none; }

.version-badge {
  font-size: 11px;
  font-weight: 500;
  color: #9aa5b1;
  letter-spacing: 0.3px;
  vertical-align: middle;
  margin-left: 2px;
}

.version-row {
  display: flex;
  justify-content: space-between;
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}

.version-row:last-of-type { border-bottom: none; }

.settings-group {
  margin-bottom: 18px;
}

.settings-group h3 {
  font-size: 14px;
  margin-bottom: 8px;
}

.helper-text {
  font-size: 12px;
  color: var(--muted);
  margin-top: 4px;
}

.overlay {
  position: fixed;
  inset: 0;
  background: rgba(15,23,32,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
}

.modal {
  background: #fff;
  border-radius: 10px;
  padding: 20px;
  width: 90%;
  max-width: 480px;
  max-height: 90vh;
  overflow-y: auto;
}

.modal h2 { margin-top: 0; }