:root {
    --primary-color: #3f4650;
    --primary-hover: #2f343b;
    --primary-soft: #eef0f3;
    --surface-color: #ffffff;
    --surface-muted: #f6f7f9;
    --surface-subtle: #eef0f3;
    --border-color: #d8dde3;
    --text-strong: #1f2328;
    --text-muted: #6c737d;
    --navbar-start: #f8f9fb;
    --navbar-mid: #e8ebef;
    --navbar-end: #d9dde3;
    --navbar-height: 56px;
    --footer-height: 26px;
    --sidebar-width: 260px;
    --sidebar-nav-bg: #ffffff;
    --sidebar-bottom-mid: #f6f7f9;
    --sidebar-bottom-end: #eef0f3;
    --sidebar-active-bg: #eef0f3;
    --sidebar-active-text: #1f2328;
    --sidebar-text: #3f4650;
    --bg-secondary: #f4f5f7;
    --card-shadow: 0 0.5rem 1.5rem rgba(31, 35, 40, 0.08);
}

body {
    font-size: 0.875rem;
    padding-top: var(--navbar-height);
    padding-bottom: var(--footer-height);
    background-color: var(--bg-secondary);
    color: var(--text-strong);
    overflow-x: hidden;
}

.navbar {
    min-height: var(--navbar-height);
    height: var(--navbar-height);
    overflow: visible;
    background: linear-gradient(90deg, var(--navbar-start) 0%, var(--navbar-mid) 55%, var(--navbar-end) 100%) !important;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 0.25rem 1rem rgba(31, 35, 40, 0.06);
    z-index: 1040;
}

.navbar .container-fluid {
    min-height: var(--navbar-height);
    height: var(--navbar-height);
    align-items: center;
}

.navbar-dark .navbar-brand {
    color: var(--text-strong);
}

.navbar-dark .navbar-brand:hover,
.navbar-dark .navbar-brand:focus {
    color: var(--primary-hover);
}

.navbar .navbar-brand {
    min-width: var(--sidebar-width);
    height: var(--navbar-height);
    position: relative;
    padding: 0;
}

.brand-logo-swap {
    position: relative;
    display: inline-block;
    width: var(--logo-width, 112px);
    height: var(--logo-height, 34px);
    flex: 0 0 auto;
}

.navbar .brand-logo-swap {
    position: absolute;
    left: 0.75rem;
    top: 0.5rem;
    width: 196px;
    height: 90px;
    padding: 0.85rem 1rem;
    background: #ffffff;
    border: 1px solid var(--border-color);
    border-radius: 0.9rem;
    box-shadow: 0 0.75rem 1.6rem rgba(31, 35, 40, 0.16);
}

.brand-logo-swap img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    opacity: 0;
    animation: logo-swap 6s ease-in-out infinite;
}

.navbar .brand-logo-swap img {
    inset: 0.8rem 1rem;
    width: calc(100% - 2rem);
    height: calc(100% - 1.6rem);
}

.brand-logo-swap img:first-child {
    opacity: 1;
}

.brand-logo-swap img:nth-child(2) {
    animation-delay: 3s;
}

@keyframes logo-swap {
    0%,
    42% {
        opacity: 1;
    }

    50%,
    92% {
        opacity: 0;
    }

    100% {
        opacity: 1;
    }
}

.sidebar {
    position: fixed;
    top: var(--navbar-height);
    bottom: var(--footer-height);
    left: 0;
    width: var(--sidebar-width);
    overflow-y: auto;
    padding: 0.9rem 0.75rem 1.25rem;
    background: linear-gradient(180deg, var(--sidebar-nav-bg) 0%, var(--sidebar-bottom-mid) 100%);
    z-index: 1030;
    border-right: 1px solid var(--border-color);
    box-shadow: 0.35rem 0 1.5rem rgba(31, 35, 40, 0.04);
    padding-top: 3.4rem;
}

.sidebar .nav-link {
    color: var(--sidebar-text);
    padding: 0.72rem 0.85rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.18rem;
    border: 1px solid transparent;
    border-radius: 0.7rem;
    font-weight: 500;
    transition: background-color .18s ease, border-color .18s ease, color .18s ease, box-shadow .18s ease;
}

.sidebar .nav-link i {
    color: #6c737d;
}

.sidebar .nav-link:hover,
.sidebar .nav-link:focus {
    background-color: var(--surface-muted);
    border-color: var(--border-color);
    color: var(--text-strong);
}

.sidebar .nav-link.active {
    background-color: var(--sidebar-active-bg);
    color: var(--sidebar-active-text);
    border-color: var(--border-color);
    box-shadow: inset 3px 0 0 var(--primary-color);
}

.sidebar .nav-link.active i,
.sidebar .nav-link:hover i,
.sidebar .nav-link:focus i {
    color: var(--primary-color);
}

.sidebar .nav-link[aria-expanded="true"]:not(.active) {
    background-color: var(--surface-muted);
    border-color: var(--border-color);
}

.sidebar .collapse .nav-link {
    padding: 0.48rem 0.75rem;
    margin-left: 0.1rem;
    font-size: 0.82rem;
    color: var(--text-muted);
}

.content-area {
    position: relative;
    margin-left: var(--sidebar-width);
    width: calc(100% - var(--sidebar-width));
    padding-top: 1.25rem;
    padding-bottom: calc(2rem + var(--footer-height));
}

.app-footer {
    position: fixed;
    right: 0;
    bottom: 0;
    left: 0;
    z-index: 1050;
    height: var(--footer-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0 0.75rem;
    color: #d8dde3;
    background: #343434;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    font-size: 0.72rem;
    line-height: 1;
}

.app-footer-title,
.app-footer-meta {
    display: flex;
    align-items: center;
    gap: 0.9rem;
    min-width: 0;
}

.app-footer-title {
    color: #f4f5f7;
    font-weight: 500;
}

.app-footer-meta span,
.app-footer-title span {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    white-space: nowrap;
}

.app-footer i {
    color: #b8bec6;
    font-size: 0.75rem;
}

.card {
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
}

.card-header {
    background-color: var(--surface-muted);
    border-bottom-color: var(--border-color);
    color: var(--text-strong);
    font-weight: 600;
}

.bg-light,
.table-light {
    background-color: var(--surface-muted) !important;
}

.text-muted {
    color: var(--text-muted) !important;
}

.text-primary,
.text-success,
.text-info,
.text-warning,
.text-danger {
    color: var(--primary-color) !important;
}

.border-primary,
.border-success,
.border-info,
.border-warning,
.border-danger {
    border-color: var(--border-color) !important;
}

.btn-primary,
.btn-success,
.btn-info,
.btn-warning,
.btn-danger {
    --bs-btn-color: #ffffff;
    --bs-btn-bg: var(--primary-color);
    --bs-btn-border-color: var(--primary-color);
    --bs-btn-hover-color: #ffffff;
    --bs-btn-hover-bg: var(--primary-hover);
    --bs-btn-hover-border-color: var(--primary-hover);
    --bs-btn-focus-shadow-rgb: 63, 70, 80;
    --bs-btn-active-color: #ffffff;
    --bs-btn-active-bg: var(--primary-hover);
    --bs-btn-active-border-color: var(--primary-hover);
    --bs-btn-disabled-bg: #9aa1aa;
    --bs-btn-disabled-border-color: #9aa1aa;
}

.btn-outline-primary,
.btn-outline-success,
.btn-outline-info,
.btn-outline-warning,
.btn-outline-danger {
    --bs-btn-color: var(--primary-color);
    --bs-btn-border-color: #aeb5bd;
    --bs-btn-hover-color: #ffffff;
    --bs-btn-hover-bg: var(--primary-color);
    --bs-btn-hover-border-color: var(--primary-color);
    --bs-btn-focus-shadow-rgb: 63, 70, 80;
    --bs-btn-active-color: #ffffff;
    --bs-btn-active-bg: var(--primary-hover);
    --bs-btn-active-border-color: var(--primary-hover);
}

.btn-secondary,
.btn-outline-secondary {
    --bs-btn-focus-shadow-rgb: 108, 115, 125;
}

.badge.text-bg-primary,
.badge.text-bg-success,
.badge.text-bg-info,
.badge.text-bg-warning,
.badge.text-bg-danger,
.badge.text-bg-secondary,
.toast.text-bg-success,
.toast.text-bg-info,
.toast.text-bg-warning,
.toast.text-bg-danger {
    color: var(--text-strong) !important;
    background-color: var(--surface-subtle) !important;
    border: 1px solid var(--border-color) !important;
}

.badge.text-bg-light {
    color: var(--text-strong) !important;
    background-color: #ffffff !important;
}

.toast .btn-close-white {
    filter: none;
}

.alert-warning,
.alert-info,
.alert-success,
.alert-danger {
    --bs-alert-color: var(--text-strong);
    --bs-alert-bg: var(--surface-muted);
    --bs-alert-border-color: var(--border-color);
}

.progress {
    background-color: var(--surface-subtle);
}

.progress-bar,
.progress-bar.bg-success,
.progress-bar.bg-warning,
.progress-bar.bg-danger,
.progress-bar.bg-info {
    background-color: var(--primary-color) !important;
}

.form-control:focus,
.form-select:focus {
    border-color: #9aa1aa;
    box-shadow: 0 0 0 0.2rem rgba(63, 70, 80, 0.16);
}

a {
    color: var(--primary-color);
}

a:hover {
    color: var(--primary-hover);
}

@media (max-width: 767.98px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.show {
        transform: translateX(0);
    }

    .content-area {
        margin-left: 0;
        width: 100%;
    }
}