/* === Layout: Sidebar, Main, Topbar, Pages === */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg);
    color: var(--text);
    display: flex;
    height: 100vh;
    overflow: hidden;
    line-height: 1.5;
}

/* --- Sidebar --- */
.sidebar {
    width: 240px;
    min-width: 240px;
    background: var(--bg-sidebar);
    backdrop-filter: var(--blur-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 20px 0;
    overflow-y: auto;
    transition: background var(--transition);
}

.sidebar-brand {
    padding: 0 20px 20px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 16px;
}
.sidebar-brand h1 {
    font-size: 14px;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text);
}
.sidebar-brand p {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 4px;
}

.sidebar-nav { flex: 1; padding: 0 10px; }
.nav-section { margin-bottom: 20px; }
.nav-section-title {
    font-size: 10px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-dim);
    padding: 0 12px;
    margin-bottom: 6px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 12px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition);
    position: relative;
}
.nav-item:hover {
    background: var(--accent-dim);
    color: var(--text);
}
.nav-item.active {
    background: var(--accent-dim);
    color: var(--accent);
    font-weight: 500;
}
.nav-item.active::before {
    content: \'\';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 20px;
    background: var(--accent);
    border-radius: 0 3px 3px 0;
}
.nav-item svg { width: 16px; height: 16px; flex-shrink: 0; }
.nav-badge {
    margin-left: auto;
    font-size: 10px;
    padding: 2px 7px;
    border-radius: 10px;
    background: var(--accent-dim);
    color: var(--accent);
    font-weight: 500;
}
.nav-badge.live {
    background: var(--green-dim);
    color: var(--green);
    animation: pulse 2s infinite;
}
@keyframes pulse { 0%,100%{opacity:1}50%{opacity:0.5} }

.sidebar-footer {
    padding: 16px 20px 0;
    border-top: 1px solid var(--border);
    font-size: 10px;
    color: var(--text-dim);
}

/* --- Main Area --- */
.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    min-height: 0;
    min-width: 0;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 28px;
    border-bottom: 1px solid var(--border);
    background: var(--bg-card);
    backdrop-filter: var(--blur-sidebar);
    min-height: 52px;
    transition: background var(--transition);
}
.topbar-title { font-size: 15px; font-weight: 600; letter-spacing: -0.01em; }
.topbar-right { display: flex; align-items: center; gap: 12px; }
.topbar-badge {
    font-size: 11px;
    padding: 4px 10px;
    border-radius: 20px;
    background: var(--accent-dim);
    color: var(--accent);
    display: flex;
    align-items: center;
    gap: 6px;
}
.topbar-badge .dot {
    width: 6px; height: 6px;
    border-radius: 50%;
    background: var(--green);
    animation: pulse 2s infinite;
}

/* --- Sub-tabs --- */
.subtabs {
    display: flex;
    gap: 2px;
    padding: 8px 28px;
    border-bottom: 1px solid var(--border);
    background: var(--bg);
}
.subtab {
    padding: 7px 16px;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-muted);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    border: none;
    background: none;
    font-family: inherit;
}
.subtab:hover { color: var(--text); background: var(--accent-dim); }
.subtab.active {
    color: var(--accent);
    background: var(--accent-dim);
}

/* --- Pages --- */
.page-container {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
    min-height: 0;
    padding: var(--gap-section) 28px;
}
.page { display: none; }
.page.active { display: block; }

/* --- Section heads --- */
.section-head { margin-bottom: var(--gap-section); }
.section-head h2 { font-size: 18px; font-weight: 700; letter-spacing: -0.02em; }
.section-head .sh-sub { font-size: 12px; color: var(--text-muted); margin-top: 4px; display: block; }

/* --- Scrollbar (visible) --- */
::-webkit-scrollbar { width: 12px; height: 12px; }
::-webkit-scrollbar-track { background: rgba(255,255,255,0.03); }
::-webkit-scrollbar-thumb { background: var(--border-hover); border-radius: 6px; border: 2px solid transparent; background-clip: padding-box; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); background-clip: padding-box; border: 2px solid transparent; }
/* Firefox */
* { scrollbar-width: thin; scrollbar-color: var(--border-hover) transparent; }

/* --- Cards --- */
.card, .stat-card, .metric-card, .chart-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 20px;
    transition: all var(--transition);
    box-shadow: var(--shadow-card);
}
.card:hover, .stat-card:hover, .metric-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-hover);
}
.card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.card-title { font-size: 13px; font-weight: 600; color: var(--text); }
.card-subtitle { font-size: 11px; color: var(--text-muted); }

/* --- Grids --- */
.overview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--gap-grid);
    margin-bottom: var(--gap-section);
}
.overview-bottom {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--gap-grid);
}

/* --- Stats --- */
.stat-label { font-size: 11px; color: var(--text-muted); margin-bottom: 8px; text-transform: uppercase; letter-spacing: 0.04em; }
.stat-value { font-size: 28px; font-weight: 700; letter-spacing: -0.03em; }
.stat-change { font-size: 11px; color: var(--green); margin-top: 6px; }

/* --- Modal --- */
.modal-overlay {
    position: fixed; inset: 0;
    background: rgba(0,0,10,0.7);
    backdrop-filter: blur(4px);
    display: flex; align-items: center; justify-content: center;
    z-index: 9999;
    opacity: 0; pointer-events: none;
    transition: opacity var(--transition);
}
.modal-overlay.visible,
.modal-overlay.open { opacity: 1; pointer-events: all; }
.modal {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 28px;
    max-width: 500px;
    width: 90%;
    box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

/* --- Toast --- */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    padding: 10px 20px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 12px;
    color: var(--text);
    box-shadow: 0 8px 30px rgba(0,0,0,0.3);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 10000;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }