:root {
    --vb-primary: #0d9488;
    --vb-primary-dark: #0f766e;
    --vb-primary-light: #ccfbf1;
    --vb-accent: #f59e0b;
    --vb-bg: #f1f5f9;
    --vb-surface: #ffffff;
    --vb-text: #0f172a;
    --vb-muted: #64748b;
    --vb-border: #e2e8f0;
    --vb-success: #16a34a;
    --vb-danger:  #dc2626;
    --vb-warning: #f59e0b;
    --vb-info:    #0ea5e9;
    --vb-sidebar-bg: #0f172a;
    --vb-sidebar-text: #cbd5e1;
    --vb-sidebar-active: #14b8a6;
    --sidebar-w: 260px;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
    font-family: 'Inter', system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    background: var(--vb-bg);
    color: var(--vb-text);
    -webkit-font-smoothing: antialiased;
    margin: 0;
}

.app-layout { display: flex; min-height: 100vh; }

/* ----- Sidebar ----- */
.app-sidebar {
    width: var(--sidebar-w);
    background: var(--vb-sidebar-bg);
    color: var(--vb-sidebar-text);
    display: flex;
    flex-direction: column;
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 1040;
    transition: transform .25s ease;
    overflow-y: auto;
    overscroll-behavior: contain;
}

.sidebar-brand {
    display: flex; align-items: center; gap: .75rem;
    padding: 1.1rem 1.25rem;
    border-bottom: 1px solid rgba(255,255,255,.08);
}
.sidebar-brand img {
    width: 40px; height: 40px;
    border-radius: 10px; object-fit: cover;
    box-shadow: 0 4px 12px rgba(20,184,166,.4);
}
.sidebar-brand .brand-text {
    color: #fff; font-weight: 700; line-height: 1.1;
}
.sidebar-brand .brand-text small {
    color: #94a3b8; font-weight: 400; font-size: .72rem;
}

.sidebar-section {
    padding: 1rem 1.25rem .35rem;
    color: #64748b;
    font-size: .7rem;
    font-weight: 600;
    letter-spacing: .08em;
    text-transform: uppercase;
}

.sidebar-nav { list-style: none; padding: 0; margin: 0 0 1rem; }
.sidebar-nav li { padding: 0 .75rem; }
.sidebar-nav a {
    display: flex; align-items: center; gap: .75rem;
    padding: .65rem .85rem;
    margin: 2px 0;
    color: var(--vb-sidebar-text);
    text-decoration: none;
    border-radius: 10px;
    font-size: .92rem;
    font-weight: 500;
    transition: background .15s ease, color .15s ease;
}
.sidebar-nav a i { font-size: 1.1rem; width: 22px; text-align: center; }
.sidebar-nav a:hover { background: rgba(255,255,255,.06); color: #fff; }
.sidebar-nav a.active {
    background: linear-gradient(135deg, var(--vb-sidebar-active), #0d9488);
    color: #fff;
    box-shadow: 0 6px 18px rgba(20,184,166,.25);
}

.sidebar-user {
    margin-top: auto;
    padding: 1rem 1.25rem;
    border-top: 1px solid rgba(255,255,255,.08);
    display: flex; align-items: center; gap: .75rem;
}
.sidebar-user .avatar {
    width: 38px; height: 38px;
    border-radius: 50%;
    background: linear-gradient(135deg, #14b8a6, #0d9488);
    color: #fff;
    display: grid; place-items: center;
    font-weight: 700;
    flex-shrink: 0;
}
.sidebar-user .uname { color: #fff; font-weight: 600; font-size: .9rem; line-height: 1.1; }
.sidebar-user .urole { color: #94a3b8; font-size: .75rem; }
.sidebar-user a.logout {
    color: #f87171; margin-left: auto;
    text-decoration: none;
}
.sidebar-user a.logout:hover { color: #fca5a5; }

/* ----- Main ----- */
.app-main {
    margin-left: var(--sidebar-w);
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.app-topbar {
    background: var(--vb-surface);
    padding: .75rem 1.25rem;
    border-bottom: 1px solid var(--vb-border);
    display: flex; align-items: center; gap: .75rem;
    position: sticky; top: 0; z-index: 1020;
    box-shadow: 0 1px 3px rgba(0,0,0,.03);
}
.app-topbar .page-title {
    font-size: 1.1rem; font-weight: 700;
    color: var(--vb-text);
    margin: 0;
}
.app-topbar .page-sub { color: var(--vb-muted); font-size: .85rem; }

.menu-toggle {
    display: none;
    background: transparent;
    border: 0;
    font-size: 1.4rem;
    color: var(--vb-text);
}

.app-content {
    padding: 1.25rem;
    flex: 1;
    min-width: 0;
}

.app-footer {
    padding: 1rem 1.25rem;
    text-align: center;
    color: var(--vb-muted);
    font-size: .85rem;
    border-top: 1px solid var(--vb-border);
    background: #fff;
}

/* ----- KPI Cards ----- */
.kpi-card {
    background: #fff;
    border-radius: 16px;
    padding: 1.1rem 1.25rem;
    box-shadow: 0 1px 3px rgba(15,23,42,.04), 0 4px 16px rgba(15,23,42,.04);
    border: 1px solid var(--vb-border);
    height: 100%;
    position: relative;
    overflow: hidden;
}
.kpi-card::before {
    content: '';
    position: absolute; right: -20px; top: -20px;
    width: 100px; height: 100px; border-radius: 50%;
    opacity: .08;
    background: var(--accent, var(--vb-primary));
}
.kpi-card .kpi-icon {
    width: 46px; height: 46px;
    border-radius: 12px;
    display: grid; place-items: center;
    font-size: 1.35rem;
    color: #fff;
    background: var(--accent, var(--vb-primary));
    box-shadow: 0 8px 18px rgba(13,148,136,.25);
}
.kpi-card .kpi-label {
    color: var(--vb-muted);
    font-size: .82rem;
    font-weight: 500;
    margin-top: .85rem;
    text-transform: uppercase;
    letter-spacing: .04em;
}
.kpi-card .kpi-value {
    font-size: 1.65rem;
    font-weight: 700;
    color: var(--vb-text);
    line-height: 1.15;
    margin-top: .15rem;
    overflow-wrap: anywhere;
}
.kpi-card .kpi-foot {
    margin-top: .65rem;
    font-size: .8rem;
    color: var(--vb-muted);
}
.kpi-card .kpi-foot .delta-up   { color: var(--vb-success); font-weight: 600; }
.kpi-card .kpi-foot .delta-down { color: var(--vb-danger);  font-weight: 600; }

.kpi-card.kpi-link {
    cursor: pointer;
    transition: transform .12s ease, box-shadow .12s ease, border-color .12s ease;
}
.kpi-card.kpi-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(15,23,42,.08), 0 12px 28px rgba(15,23,42,.06);
    border-color: #cbd5e1;
}
.kpi-card.kpi-link::after {
    content: '\F285'; /* bi-arrow-right-circle */
    font-family: 'bootstrap-icons';
    position: absolute;
    bottom: 12px; right: 14px;
    color: var(--vb-muted);
    opacity: 0;
    transition: opacity .15s ease, transform .15s ease;
    font-size: .9rem;
}
.kpi-card.kpi-link:hover::after { opacity: .9; transform: translateX(2px); }
.kpi-card .kpi-link-overlay {
    position: absolute;
    inset: 0;
    z-index: 1;
}

.kpi-emerald { --accent: #10b981; }
.kpi-blue    { --accent: #3b82f6; }
.kpi-amber   { --accent: #f59e0b; }
.kpi-rose    { --accent: #ef4444; }
.kpi-violet  { --accent: #8b5cf6; }
.kpi-cyan    { --accent: #06b6d4; }

/* ----- Cards generic ----- */
.surface-card {
    background: #fff;
    border-radius: 16px;
    border: 1px solid var(--vb-border);
    box-shadow: 0 1px 3px rgba(15,23,42,.04);
}
.surface-card .card-head {
    padding: 1rem 1.25rem;
    border-bottom: 1px solid var(--vb-border);
    display: flex; align-items: center; gap: .75rem;
    flex-wrap: wrap;
}
.surface-card .card-head h2,
.surface-card .card-head h3 {
    margin: 0;
    font-size: 1rem;
    font-weight: 700;
    color: var(--vb-text);
}
.surface-card .card-head .head-actions {
    margin-left: auto;
    display: flex; gap: .5rem; flex-wrap: wrap;
}
.surface-card .card-body { padding: 1.25rem; }

/* Buttons */
.btn-primary {
    --bs-btn-bg: var(--vb-primary);
    --bs-btn-border-color: var(--vb-primary);
    --bs-btn-hover-bg: var(--vb-primary-dark);
    --bs-btn-hover-border-color: var(--vb-primary-dark);
    --bs-btn-active-bg: var(--vb-primary-dark);
    --bs-btn-active-border-color: var(--vb-primary-dark);
    --bs-btn-disabled-bg: var(--vb-primary);
    --bs-btn-disabled-border-color: var(--vb-primary);
}
.btn-outline-primary {
    --bs-btn-color: var(--vb-primary);
    --bs-btn-border-color: var(--vb-primary);
    --bs-btn-hover-bg: var(--vb-primary);
    --bs-btn-hover-border-color: var(--vb-primary);
    --bs-btn-active-bg: var(--vb-primary);
    --bs-btn-active-border-color: var(--vb-primary);
}

/* Tables */
.table-responsive { border-radius: 12px; }
.table thead th {
    background: #f8fafc;
    color: var(--vb-text);
    font-weight: 600;
    font-size: .85rem;
    border-bottom: 1px solid var(--vb-border);
    white-space: nowrap;
}
.table tbody td {
    vertical-align: middle;
    font-size: .9rem;
}
.table-hover tbody tr:hover {
    background-color: #f8fafc;
}

/* DataTables overrides */
.dataTables_wrapper .dt-buttons .btn { margin-right: 4px; }
.dataTables_wrapper .dataTables_filter input,
.dataTables_wrapper .dataTables_length select {
    border: 1px solid var(--vb-border);
    border-radius: 8px;
    padding: .35rem .6rem;
}
table.dataTable thead .sorting,
table.dataTable thead .sorting_asc,
table.dataTable thead .sorting_desc { cursor: pointer; }

/* Status pulse */
.live-dot {
    display: inline-block;
    width: 8px; height: 8px;
    background: #16a34a;
    border-radius: 50%;
    box-shadow: 0 0 0 0 rgba(22,163,74,.6);
    animation: livePulse 1.4s infinite;
    margin-right: 6px;
}
@keyframes livePulse {
    0%   { box-shadow: 0 0 0 0 rgba(22,163,74,.5); }
    70%  { box-shadow: 0 0 0 10px rgba(22,163,74,0); }
    100% { box-shadow: 0 0 0 0 rgba(22,163,74,0); }
}

/* Charts wrapper */
.chart-wrap {
    position: relative;
    width: 100%;
    min-height: 240px;
}
.chart-wrap.h-260 { height: 260px; }
.chart-wrap.h-320 { height: 320px; }
.chart-wrap.h-380 { height: 380px; }
@media (max-width: 575.98px) {
    .chart-wrap.h-260 { height: 220px; }
    .chart-wrap.h-320 { height: 260px; }
    .chart-wrap.h-380 { height: 300px; }
}

/* Filter bar */
.filter-bar {
    background: #fff;
    border: 1px solid var(--vb-border);
    border-radius: 14px;
    padding: 1rem;
    margin-bottom: 1rem;
    box-shadow: 0 1px 3px rgba(15,23,42,.03);
}
.filter-bar label { font-weight: 600; font-size: .82rem; color: var(--vb-muted); }
.filter-bar .form-control,
.filter-bar .form-select { border-radius: 10px; }
.range-quick .btn {
    border-radius: 999px;
    padding: .25rem .8rem;
    font-size: .8rem;
}

/* Mobile / Sidebar collapse */
.sidebar-backdrop {
    position: fixed; inset: 0;
    background: rgba(15,23,42,.45);
    backdrop-filter: blur(2px);
    z-index: 1035;
    display: none;
}
.sidebar-open .sidebar-backdrop { display: block; }
.sidebar-open .app-sidebar { transform: translateX(0); }

@media (max-width: 991.98px) {
    :root { --sidebar-w: 280px; }
    .app-sidebar { transform: translateX(-105%); box-shadow: 0 10px 35px rgba(0,0,0,.3); }
    .app-main { margin-left: 0; }
    .menu-toggle { display: inline-flex; align-items: center; }
}

@media (max-width: 575.98px) {
    .app-content { padding: .9rem; }
    .kpi-card .kpi-value { font-size: 1.35rem; }
    .filter-bar { padding: .75rem; }
}

/* Print */
@media print {
    .app-sidebar, .app-topbar, .app-footer, .head-actions, .filter-bar, .no-print { display: none !important; }
    .app-main { margin-left: 0 !important; }
    body { background: #fff; }
    .surface-card { border: 0; box-shadow: none; }
}