:root {
    --sidebar-width: 250px;
    --brand: #2563eb;
    --brand-dark: #1e3a8a;
    --brand-light: #eff6ff;
    --ink: #1e293b;
    --muted: #64748b;
    --surface: #ffffff;
    --bg: #f4f6fb;
    --radius: 0.65rem;
}

body {
    background-color: var(--bg);
    color: var(--ink);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

h1, h2, h3, .h4, .h5, .h6 {
    font-weight: 600;
    letter-spacing: -0.01em;
}

/* ---------- Guest / login screen ---------- */

.guest-body {
    background: radial-gradient(circle at top, var(--brand-dark), #0f172a 70%);
    min-height: 100vh;
}

.guest-brand-icon {
    width: 64px;
    height: 64px;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    margin: 0 auto 0.75rem;
    backdrop-filter: blur(4px);
}

/* ---------- Top navbar ---------- */

.app-navbar {
    background: var(--brand-dark);
    height: 56px;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1030;
}

.app-navbar .navbar-brand {
    color: #fff;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.app-navbar .navbar-brand i {
    color: #93c5fd;
}

/* ---------- Sidebar ---------- */

.app-sidebar {
    width: var(--sidebar-width);
    min-height: 100vh;
    background: #111827;
    padding-top: 56px;
    z-index: 1020;
    transition: margin-left 0.15s ease;
}

.app-sidebar .nav {
    padding: 1rem 0.75rem;
}

.app-sidebar .nav-link {
    color: #cbd5e1;
    border-radius: 0.5rem;
    padding: 0.55rem 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.65rem;
    font-size: 0.925rem;
    transition: background-color 0.12s ease, color 0.12s ease;
}

.app-sidebar .nav-link i {
    font-size: 1.05rem;
    width: 1.2rem;
    text-align: center;
    opacity: 0.85;
}

.app-sidebar .nav-link:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.06);
}

.app-sidebar .nav-link.active {
    color: #fff;
    background: var(--brand);
}

.app-sidebar .nav-link.active i {
    opacity: 1;
}

.app-sidebar .sidebar-section-label {
    color: #64748b;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    padding: 0.85rem 0.85rem 0.25rem;
}

/* ---------- Main content ---------- */

.app-main {
    margin-left: var(--sidebar-width);
    padding: 1.75rem 2rem 3rem;
    padding-top: calc(56px + 1.75rem);
    min-height: 100vh;
}

@media (max-width: 767.98px) {
    .app-sidebar {
        margin-left: calc(-1 * var(--sidebar-width));
        position: fixed;
    }
    .app-sidebar.show {
        margin-left: 0;
    }
    .app-main {
        margin-left: 0;
        padding: 1.25rem 1rem 2.5rem;
        padding-top: calc(56px + 1.25rem);
    }
}

/* ---------- Cards, tables, forms ---------- */

.card {
    border: 1px solid rgba(15, 23, 42, 0.06);
    border-radius: var(--radius);
    box-shadow: 0 1px 3px rgba(15, 23, 42, 0.05);
}

.shadow-sm {
    box-shadow: 0 1px 3px rgba(15, 23, 42, 0.06) !important;
}

.table-responsive {
    background: var(--surface);
    border-radius: var(--radius);
    box-shadow: 0 1px 3px rgba(15, 23, 42, 0.05);
    overflow: hidden;
}

.table {
    margin-bottom: 0;
}

.table thead th {
    background: #f8fafc;
    color: var(--muted);
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    font-weight: 600;
    border-bottom: 1px solid #e2e8f0;
    padding: 0.85rem 1rem;
}

.table tbody td {
    padding: 0.75rem 1rem;
    vertical-align: middle;
    border-color: #eef1f6;
}

.table-striped > tbody > tr:nth-of-type(odd) > * {
    background-color: #fafbfd;
}

.table tbody tr:hover {
    background-color: var(--brand-light);
}

.btn {
    border-radius: 0.5rem;
    font-weight: 500;
}

.btn-primary {
    background: var(--brand);
    border-color: var(--brand);
}

.btn-primary:hover {
    background: #1d4ed8;
    border-color: #1d4ed8;
}

.form-control, .form-select {
    border-radius: 0.5rem;
    border-color: #d8dee9;
}

.form-control:focus, .form-select:focus {
    border-color: var(--brand);
    box-shadow: 0 0 0 0.2rem rgba(37, 99, 235, 0.15);
}

.form-label {
    font-weight: 500;
    font-size: 0.875rem;
    color: #334155;
}

/* ---------- Stat cards (dashboard) ---------- */

.stat-card {
    border-radius: var(--radius);
    background: var(--surface);
    box-shadow: 0 1px 3px rgba(15, 23, 42, 0.06);
    padding: 1.1rem 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.9rem;
}

.stat-card .stat-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    flex-shrink: 0;
}

.stat-card .stat-value {
    font-size: 1.6rem;
    font-weight: 700;
    line-height: 1.1;
}

.stat-card .stat-label {
    color: var(--muted);
    font-size: 0.8rem;
}

.bg-soft-primary { background: #eff6ff; color: #1d4ed8; }
.bg-soft-success { background: #ecfdf5; color: #047857; }
.bg-soft-warning { background: #fffbeb; color: #b45309; }
.bg-soft-danger  { background: #fef2f2; color: #b91c1c; }
.bg-soft-info    { background: #ecfeff; color: #0e7490; }

/* ---------- Scan (QR) mobile-first flow ---------- */

.scan-card {
    max-width: 480px;
    margin: 0 auto;
}

.scan-report-btn {
    font-size: 1.1rem;
    padding: 0.9rem 1rem;
    border-radius: 0.65rem;
}

/* ---------- Status / F-Gas badges ---------- */

.badge {
    font-weight: 500;
    padding: 0.4em 0.7em;
    border-radius: 0.4rem;
}

.badge-status-active { background-color: #10b981; }
.badge-status-in_repair { background-color: #f59e0b; }
.badge-status-decommissioned { background-color: #64748b; }
.badge-status-stored { background-color: #0ea5e9; }

.badge-fgas-overdue { background-color: #ef4444; }
.badge-fgas-due-soon { background-color: #f59e0b; color: #000; }
.badge-fgas-ok { background-color: #10b981; }