:root {
  color-scheme: light;
  --bg: #f8fafc;
  --panel: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --muted: #64748b;
  --accent: #4f46e5;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

* {
  box-sizing: border-box;
}

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

#app {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

header.topbar {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 12px 24px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

header.topbar h1 {
  font-size: 18px;
  margin: 0;
  margin-right: auto;
}

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

nav.tabs button {
  border: none;
  background: transparent;
  padding: 8px 14px;
  border-radius: 6px;
  cursor: pointer;
  color: var(--muted);
  font-size: 14px;
}

nav.tabs button.active {
  background: var(--accent);
  color: white;
}

main {
  flex: 1;
  padding: 24px;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
}

.panel-section {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px;
  margin-bottom: 16px;
}

.panel-section h2 {
  margin-top: 0;
  font-size: 16px;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}

th, td {
  text-align: left;
  padding: 8px;
  border-bottom: 1px solid var(--border);
}

input, select {
  padding: 6px 8px;
  border: 1px solid var(--border);
  border-radius: 4px;
  font-size: 14px;
}

button.btn {
  background: var(--accent);
  color: white;
  border: none;
  padding: 6px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 14px;
}

button.btn.secondary {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
}

button.btn.danger {
  background: #ef4444;
}

.form-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 12px;
}

.gantt-row {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 32px;
}

.gantt-track {
  position: relative;
  flex: 1;
  height: 20px;
  background: #f1f5f9;
  border-radius: 4px;
}

.gantt-bar {
  position: absolute;
  top: 0;
  height: 100%;
  border-radius: 4px;
  color: white;
  font-size: 11px;
  display: flex;
  align-items: center;
  padding-left: 6px;
  white-space: nowrap;
  overflow: hidden;
}

.gantt-label {
  width: 220px;
  font-size: 13px;
  flex-shrink: 0;
}

.heatmap-table td, .heatmap-table th {
  text-align: center;
  min-width: 56px;
}

.heatmap-cell {
  border-radius: 4px;
  padding: 4px;
  font-size: 12px;
}

.tag {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 12px;
  background: #eef2ff;
  color: var(--accent);
  margin-right: 4px;
}

.muted {
  color: var(--muted);
  font-size: 13px;
}