:root {
    --bg: #0a0a0f;
    --surface: #12121a;
    --border: #2a2a3a;
    --text: #e0e0e8;
    --text-dim: #888898;
    --accent: #6c5ce7;
    --accent-dim: #4a3db8;
    --success: #00d2a0;
    --error: #ff6b6b;
    --mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: var(--mono);
    background: var(--bg);
    color: var(--text);
    font-size: 13px;
    line-height: 1.5;
}

.app {
    display: grid;
    grid-template-rows: 48px 1fr;
    height: 100vh;
    overflow: hidden;
}

/* Header */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
}

.header h1 {
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 0.05em;
    color: var(--accent);
}

.header .status {
    font-size: 11px;
    color: var(--text-dim);
}

/* Main layout */
.main {
    display: grid;
    grid-template-columns: 280px 1fr;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-header {
    padding: 12px 16px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-dim);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.sidebar-list {
    overflow-y: auto;
    flex: 1;
}

.dataset-item {
    padding: 10px 16px;
    cursor: pointer;
    border-bottom: 1px solid var(--border);
    transition: background 0.1s;
}

.dataset-item:hover {
    background: rgba(108, 92, 231, 0.1);
}

.dataset-item.active {
    background: rgba(108, 92, 231, 0.15);
    border-left: 2px solid var(--accent);
}

.dataset-item .name {
    font-weight: 600;
    font-size: 13px;
}

.dataset-item .meta {
    font-size: 11px;
    color: var(--text-dim);
    margin-top: 2px;
}

/* Content area */
.content {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

/* Query editor */
.query-editor {
    padding: 16px;
    border-bottom: 1px solid var(--border);
    display: flex;
    gap: 8px;
}

.query-editor textarea {
    flex: 1;
    background: var(--surface);
    border: 1px solid var(--border);
    color: var(--text);
    font-family: var(--mono);
    font-size: 13px;
    padding: 10px;
    border-radius: 4px;
    resize: none;
    min-height: 60px;
    outline: none;
}

.query-editor textarea:focus {
    border-color: var(--accent);
}

.btn {
    background: var(--accent);
    color: white;
    border: none;
    padding: 8px 16px;
    border-radius: 4px;
    font-family: var(--mono);
    font-size: 12px;
    cursor: pointer;
    font-weight: 600;
    white-space: nowrap;
    transition: background 0.1s;
}

.btn:hover { background: var(--accent-dim); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-sm {
    padding: 4px 10px;
    font-size: 11px;
}

/* Results */
.results {
    flex: 1;
    overflow: auto;
    padding: 16px;
}

.results-info {
    font-size: 11px;
    color: var(--text-dim);
    margin-bottom: 8px;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 12px;
}

th {
    text-align: left;
    padding: 8px 12px;
    background: var(--surface);
    border-bottom: 2px solid var(--accent);
    font-weight: 600;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--accent);
    position: sticky;
    top: 0;
}

td {
    padding: 6px 12px;
    border-bottom: 1px solid var(--border);
}

tr:hover td {
    background: rgba(108, 92, 231, 0.05);
}

/* States */
.loading {
    color: var(--accent);
    padding: 20px;
    text-align: center;
}

.error {
    color: var(--error);
    background: rgba(255, 107, 107, 0.1);
    border: 1px solid rgba(255, 107, 107, 0.3);
    padding: 12px 16px;
    border-radius: 4px;
    font-size: 12px;
}

.empty {
    color: var(--text-dim);
    padding: 40px 20px;
    text-align: center;
    font-size: 12px;
}

/* Refresh button */
.refresh-btn {
    background: none;
    border: 1px solid var(--border);
    color: var(--text-dim);
    padding: 2px 8px;
    border-radius: 3px;
    font-family: var(--mono);
    font-size: 10px;
    cursor: pointer;
}

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