:root {
  color-scheme: light;
  --border: #e5e7eb;
  --accent: #4b7bb8;
  --bg: #ffffff;
  --panel: #ffffff;
  --muted: #f5f7fb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: var(--bg);
  color: #1d2733;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 0.8rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

h1,
h2 {
  margin: 0;
}

h1 {
  font-size: 1.2rem;
}

h2 {
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.header-controls,
.header-actions,
.toolbar,
.pagination {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

#fileInput {
  display: none;
}

.file-btn,
button {
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 6px;
  padding: 0.4rem 0.7rem;
  cursor: pointer;
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.5;
}

.layout {
  display: grid;
  grid-template-columns: 320px 1fr;
  min-height: calc(100vh - 130px);
}

.sidebar {
  padding: 1rem;
  border-right: 1px solid var(--border);
  background: var(--panel);
  overflow: auto;
}

.main-panel {
  padding: 1rem;
  overflow: auto;
}

.tab-bar {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.tab-button {
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 999px;
  padding: 0.35rem 0.8rem;
}

.tab-button.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.tab-panel {
  display: none;
}

.tab-panel.active {
  display: block;
}

.drop-zone {
  border: 2px dashed var(--accent);
  border-radius: 8px;
  padding: 1rem;
  text-align: center;
  margin-bottom: 0.8rem;
  background: var(--muted);
}

.drop-zone.drag-over {
  background: #e7f0ff;
}

.table-wrap {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: auto;
  background: var(--panel);
  max-height: 50vh;
}

table {
  border-collapse: collapse;
  width: 100%;
}

th,
td {
  border-bottom: 1px solid var(--border);
  padding: 0.35rem 0.5rem;
  font-size: 0.9rem;
  max-width: 280px;
  white-space: nowrap;
  text-overflow: ellipsis;
  overflow: hidden;
}

th {
  background: var(--muted);
  position: sticky;
  top: 0;
  cursor: pointer;
}

tr:hover {
  background: #f6f9ff;
}

.code-view {
  max-height: 240px;
  overflow: auto;
  background: var(--muted);
  color: #1d2733;
  padding: 0.8rem;
  border-radius: 8px;
  font-size: 0.8rem;
}

.column-list,
.filter-controls {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 0.5rem;
}

.profile-toolbar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 1rem;
  flex-wrap: wrap;
}

.profile-status {
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  background: var(--muted);
  font-size: 0.85rem;
}

.profile-layout {
  display: grid;
  grid-template-columns: minmax(220px, 1fr) 2fr;
  gap: 1rem;
}

.profile-panel {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem;
  background: var(--panel);
  min-height: 200px;
}

.profile-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.85rem;
}

.profile-item {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.5rem;
  cursor: pointer;
  background: var(--muted);
}

.profile-item.active {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px rgba(75, 123, 184, 0.2);
}

.profile-detail {
  font-size: 0.9rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.profile-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 0.5rem;
}

.profile-card {
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.5rem;
  background: var(--muted);
}

.profile-card h3 {
  margin: 0 0 0.3rem 0;
  font-size: 0.85rem;
}

.profile-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.profile-table th,
.profile-table td {
  border-bottom: 1px solid var(--border);
  padding: 0.3rem 0.4rem;
  text-align: left;
}

footer {
  border-top: 1px solid var(--border);
  background: var(--panel);
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
}

@media (max-width: 1000px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .profile-layout {
    grid-template-columns: 1fr;
  }
}