:root {
    --bg-dark: #0a0e14;
    --sidebar-bg: #111827;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --border-color: #1f2937;
    --card-bg: #1f2937;
    --editor-bg: #111827;
    --success: #10b981;
    --danger: #ef4444;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Outfit', sans-serif; }
body.dark-theme { 
    background-color: var(--sidebar-bg); 
    color: var(--text-primary); 
    min-height: 100vh; 
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    overflow-x: hidden;
}

.app-container { display: flex; flex: 1; min-height: calc(100vh - 56px); }

/* Sidebar */
.sidebar {
    width: 280px;
    background: var(--card-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.sidebar-content {
    flex: 1;
    padding: 16px;
    padding-bottom: 0;
}

/* Hide scrollbar for sidebar content but allow scrolling */
.sidebar-content::-webkit-scrollbar { display: none; }

.logo { margin-bottom: 24px; display: flex; align-items: center; gap: 10px; }
.logo-icon { font-size: 32px; background: linear-gradient(135deg, var(--accent-blue), var(--accent-purple)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.logo h1 { font-size: 20px; letter-spacing: -0.5px; }
.logo p { font-size: 10px; letter-spacing: 1px; color: var(--text-secondary); opacity: 0.7; }

.main-nav { display: flex; flex-direction: column; gap: 4px; }
.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--text-secondary);
    font-size: 13px;
}
.nav-item:hover { background: rgba(59, 130, 246, 0.1); color: var(--text-primary); }
.nav-item.active { background: var(--accent-blue); color: white; box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3); }

.sidebar-section { margin-top: 20px; }
.sidebar-section h3 { font-size: 11px; text-transform: uppercase; color: var(--text-secondary); opacity: 0.5; margin-bottom: 8px; }
.nav-item-link {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 12px;
    border-radius: 10px;
    text-decoration: none;
    color: var(--text-secondary);
    font-size: 13px;
    transition: 0.2s;
}
.nav-item-link:hover { background: rgba(255,255,255,0.05); color: var(--text-primary); }

/* Challenge Box Compact */
.challenge-box {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    padding: 12px;
    border-radius: 10px;
}
#challenge-text { font-size: 12px; color: var(--text-primary); margin-bottom: 8px; line-height: 1.4; min-height: 32px; }
.challenge-btns { display: flex; gap: 8px; }
.btn-sm {
    font-size: 10px; font-weight: 700; text-transform: uppercase;
    padding: 4px 10px; border-radius: 6px; border: none; cursor: pointer;
    background: var(--accent-blue); color: white;
}
.btn-ghost { background: transparent; border: 1px solid var(--border-color); color: var(--text-secondary); }
.btn-ghost:hover { color: white; border-color: white; }

.sidebar-footer { 
    border-top: 1px solid var(--border-color); 
    padding: 16px; 
}
.status-indicator { display: flex; align-items: center; font-size: 13px; margin-bottom: 8px; }
#total-rows-info { font-size: 12px; color: var(--text-secondary); }

/* Main Content Area */
.content-view { flex: 1; background: var(--bg-dark); padding: 32px; position: relative; }

/* Custom Scrollbar for Premium Look */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: #1f2937; border-radius: 10px; }
::-webkit-scrollbar-thumb:hover { background: #374151; }

.view-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 32px; }
.view-header h2 { font-size: 28px; font-weight: 600; }

.tab-content { display: none; }
.tab-content.active { display: block; animation: fadeIn 0.4s ease-out; }

@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }

/* Dashboard Styling */
.kpi-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-bottom: 32px; }
.kpi-card { background: var(--card-bg); padding: 24px; border-radius: 20px; border: 1px solid var(--border-color); }
.kpi-card label { font-size: 13px; color: var(--text-secondary); margin-bottom: 8px; display: block; }
.kpi-card .value { font-size: 32px; font-weight: 700; margin-bottom: 8px; }
.trend { font-size: 12px; font-weight: 500; }
.trend.up { color: var(--success); }
.trend.down { color: var(--danger); }

.charts-row { display: grid; grid-template-columns: 1fr 2fr; gap: 24px; }
.chart-card { background: var(--card-bg); padding: 24px; border-radius: 24px; border: 1px solid var(--border-color); height: 400px; }
.chart-card h3 { font-size: 16px; margin-bottom: 24px; color: var(--text-secondary); }

/* SQL Lab Layout */
.sql-container { display: flex; flex-direction: column; gap: 24px; height: calc(100vh - 160px); }
.editor-pane { flex: 0 0 300px; }
#sql-editor { 
    width: 100%; height: 100%; background: var(--editor-bg); border: 1px solid var(--border-color);
    border-radius: 16px; padding: 20px; color: #b4bcbe; font-family: 'JetBrains Mono', monospace; font-size: 14px;
    resize: none; outline: none; line-height: 1.6;
}
.results-pane { flex: 1; overflow: hidden; background: var(--editor-bg); border-radius: 16px; border: 1px solid var(--border-color); }

/* Explorer Tab */
.explorer-grid { display: grid; grid-template-columns: 240px 1fr; gap: 32px; align-items: start; }
.explorer-menu { background: var(--card-bg); padding: 12px; border-radius: 16px; border: 1px solid var(--border-color); }
.menu-item { padding: 12px 16px; border-radius: 10px; cursor: pointer; color: var(--text-secondary); transition: 0.2s; }
.menu-item:hover { background: rgba(255,255,255,0.05); color: var(--text-primary); }
.menu-item.active { background: var(--accent-blue); color: white; }

/* Table Styling */
.table-wrapper { height: 100%; overflow: auto; }
table { width: 100%; border-collapse: collapse; }
th { position: sticky; top: 0; background: var(--card-bg); padding: 14px 20px; text-align: left; font-size: 12px; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 1px; border-bottom: 2px solid var(--border-color); z-index: 10; }
td { padding: 14px 20px; border-bottom: 1px solid var(--border-color); font-size: 13px; color: #d1d5db; }
tr:hover { background: rgba(59, 130, 246, 0.05); }

/* Buttons */
.btn { border-radius: 12px; padding: 10px 24px; font-weight: 600; cursor: pointer; border: none; transition: 0.2s; }
.btn-primary { background: var(--accent-blue); color: white; }
.btn-primary:hover { background: #2563eb; transform: translateY(-1px); box-shadow: 0 10px 20px rgba(59, 130, 246, 0.2); }
.btn-secondary { background: rgba(255,255,255,0.05); color: var(--text-primary); border: 1px solid var(--border-color); }

.pulse { width: 8px; height: 8px; border-radius: 50%; background: var(--success); margin-right: 10px; animation: pulse 2s infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); } 70% { box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); } 100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); } }