@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
    --bg-main: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --bg-sidebar: #1e293b;
    --primary-color: #38bdf8;
    --secondary-color: #10b981;
    --accent-color: #8b5cf6;
    --warning-color: #f59e0b;
    --danger-color: #f43f5e;
    --text-main: #f1f5f9;
    --text-muted: #94a3b8;
    --border-color: rgba(255, 255, 255, 0.1);
    --glass-blur: blur(12px);
    --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* ===== Sidebar ===== */
.sidebar {
    width: 240px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 100;
    flex-shrink: 0;
}

.sidebar h2 {
    font-size: 18px;
    font-weight: 700;
    color: var(--primary-color);
    padding: 24px 20px;
    letter-spacing: -0.5px;
    border-bottom: 1px solid var(--border-color);
}

.menu { list-style: none; padding: 12px 10px; flex: 1; overflow-y: auto; }
.menu-item { margin-bottom: 2px; }

.menu-item a {
    display: flex;
    align-items: center;
    padding: 10px 14px;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s;
    font-weight: 500;
    font-size: 13px;
}

.menu-item a:hover {
    color: var(--text-main);
    background-color: rgba(255, 255, 255, 0.05);
}

.menu-item.active a {
    color: #fff;
    background-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(56, 189, 248, 0.3);
}

/* ===== Main Content ===== */
.main-content {
    flex: 1;
    overflow-y: auto;
    padding: 28px;
    background: radial-gradient(circle at top right, rgba(56, 189, 248, 0.05), transparent 400px),
                radial-gradient(circle at bottom left, rgba(139, 92, 246, 0.05), transparent 400px);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.header h1 {
    font-size: 24px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

/* ===== Tab Bar ===== */
.tab-bar {
    display: flex;
    gap: 4px;
    background: rgba(30, 41, 59, 0.6);
    padding: 4px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.tab-bar .tab {
    padding: 6px 16px;
    border-radius: 8px;
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    border: none;
    background: none;
}

.tab-bar .tab:hover { color: var(--text-main); }

.tab-bar .tab.active {
    background: var(--primary-color);
    color: #fff;
    box-shadow: 0 2px 8px rgba(56, 189, 248, 0.3);
}

/* ===== Metric Cards ===== */
.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.metric-card {
    background-color: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    padding: 20px;
    border-radius: 14px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.metric-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0;
    width: 3px; height: 100%;
    background-color: var(--primary-color);
    opacity: 0.8;
}

.metric-card:hover {
    transform: translateY(-3px);
    border-color: rgba(56, 189, 248, 0.3);
    box-shadow: var(--shadow-lg);
}

.metric-card .label {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.metric-card .value {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 4px;
}

.metric-card .change {
    font-size: 12px;
    font-weight: 600;
    display: inline-flex;
    align-items: center;
}

.metric-card .change.positive { color: var(--secondary-color); }
.metric-card .change.negative { color: var(--danger-color); }

/* Warning Cards */
.metric-card.warning { border-color: rgba(245, 158, 11, 0.4); }
.metric-card.warning::before { background-color: var(--warning-color); }
.metric-card.danger { border-color: rgba(244, 63, 94, 0.4); }
.metric-card.danger::before { background-color: var(--danger-color); }

/* ===== Charts ===== */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.chart-container {
    background-color: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    padding: 20px;
    border-radius: 14px;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.chart-container.full-width { grid-column: 1 / -1; }

.chart-container h3 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 16px;
    color: var(--text-main);
}

.chart { height: 320px; }

/* ===== Insight Cards ===== */
.insight-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.insight-card {
    background: var(--bg-card);
    backdrop-filter: var(--glass-blur);
    border-radius: 14px;
    border: 1px solid var(--border-color);
    padding: 24px;
    transition: all 0.3s;
}

.insight-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.insight-card .icon {
    width: 40px; height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    margin-bottom: 14px;
}

.insight-card h4 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 8px;
}

.insight-card p {
    font-size: 13px;
    color: var(--text-muted);
    line-height: 1.6;
}

.insight-card .tag {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    margin-top: 12px;
}

.tag-up { background: rgba(16, 185, 129, 0.15); color: #10b981; }
.tag-down { background: rgba(244, 63, 94, 0.15); color: #f43f5e; }
.tag-neutral { background: rgba(56, 189, 248, 0.15); color: #38bdf8; }

/* ===== Footer ===== */
.footer {
    margin-top: 20px;
    text-align: center;
    color: var(--text-muted);
    font-size: 12px;
    padding: 16px 0;
}

/* ===== Responsive ===== */
@media (max-width: 1200px) {
    .charts-grid { grid-template-columns: 1fr; }
    .insight-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .sidebar { width: 60px; }
    .sidebar h2 { display: none; }
    .menu-item a span:last-child { display: none; }
    .insight-grid { grid-template-columns: 1fr; }
}