:root {
    --sidebar-width: 260px;
    --sidebar-dark: #001a35;
    --sidebar-light: #003866;
    --active: rgba(16, 83, 145, .64);
    --accent: #ff161f;
}

* {
    box-sizing: border-box;
}

html,
body {
    min-width: 320px;
    min-height: 100%;
    margin: 0;
}

body {
    color: #fff;
    background: #fff;
    font-family: "Segoe UI", Arial, sans-serif;
}

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

.sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 1;
    width: var(--sidebar-width);
    min-height: 100vh;
    overflow-y: auto;
    background:
        radial-gradient(circle at 92% 48%, rgba(0, 76, 130, .52), transparent 40%),
        linear-gradient(145deg, var(--sidebar-dark), #00284d 55%, var(--sidebar-light));
    box-shadow: 2px 0 8px rgba(0, 25, 52, .16);
    scrollbar-color: rgba(219, 227, 238, .62) transparent;
    scrollbar-width: thin;
}

.sidebar::-webkit-scrollbar {
    width: 11px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    border: 2px solid transparent;
    border-radius: 8px;
    background: rgba(219, 227, 238, .62);
    background-clip: padding-box;
}

.brand {
    display: flex;
    min-height: 72px;
    padding: 12px 14px;
    align-items: center;
    gap: 10px;
    letter-spacing: .3px;
}

.brand-copy {
    display: flex;
    min-width: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    white-space: nowrap;
}

.brand-copy strong {
    font-size: 18px;
    line-height: 1.05;
    font-weight: 800;
    letter-spacing: .5px;
}

.brand-copy span {
    margin: 0;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: .35px;
}

.main-nav {
    padding: 0 9px 112px;
}

.nav-item {
    position: relative;
    display: grid;
    min-height: 54px;
    padding: 0 10px 0 16px;
    grid-template-columns: 35px minmax(0, 1fr);
    align-items: center;
    border-radius: 6px;
    color: #fff;
    font-size: 14px;
    line-height: 1.28;
    text-decoration: none;
    transition: background-color .15s ease;
}

.nav-item:hover,
.nav-item:focus-visible {
    background: rgba(19, 91, 153, .42);
    outline: none;
}

.nav-item.active {
    background: var(--active);
}

.nav-item.active::before {
    position: absolute;
    inset: 0 auto 0 -9px;
    width: 4px;
    background: var(--accent);
    content: "";
}

.icon {
    display: inline-flex;
    width: 22px;
    height: 22px;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-family: "Segoe UI Symbol", "Arial Unicode MS", sans-serif;
    font-size: 22px;
    font-weight: 700;
    line-height: 1;
}

.icon-box {
    font-size: 24px;
}

.workspace {
    min-width: 0;
    min-height: 100vh;
    margin-left: var(--sidebar-width);
    flex: 1;
    background: #fff;
}

.catalog-frame { display: block; width: 100%; height: 100vh; border: 0; background: #f4f6f9; }
.catalog-frame[hidden] { display: none; }
.catalog-frame.is-loading { visibility: hidden; }

@media (max-width: 700px) {
    :root {
        --sidebar-width: 232px;
    }

    .brand {
        padding-left: 20px;
    }

    .nav-item {
        font-size: 13px;
    }
}

.catalog-menu > summary {
    cursor: pointer;
    list-style: none;
    grid-template-columns: 35px minmax(0, 1fr) 18px;
}
.catalog-menu > summary::-webkit-details-marker { display: none; }
.catalog-arrow { font-size: 24px; text-align: center; transition: transform .15s ease; }
.catalog-menu[open] > summary .catalog-arrow { transform: rotate(90deg); }
.catalog-menu[open] > summary { background: rgba(19, 91, 153, .25); }
.catalog-links { margin-left: 16px; border-left: 1px solid rgba(255, 255, 255, .2); }
.catalog-links .nav-item { min-height: 44px; padding-left: 12px; grid-template-columns: 25px minmax(0, 1fr); }
.catalog-links .icon { font-size: 16px; }
.catalog-icon { display: block; width: 22px; height: 22px; flex-shrink: 0; }
.catalog-links .catalog-icon { width: 20px; height: 20px; }
.sidebar-collapsed .catalog-links .catalog-icon { width: 22px; height: 22px; }

.brand { position: relative; }
.sidebar-toggle {
    position: static;
    flex: 0 0 36px;
    width: 36px;
    height: 36px;
    padding: 0;
    border: 1px solid rgba(255, 255, 255, .3);
    border-radius: 6px;
    color: #fff;
    background: transparent;
    cursor: pointer;
}
.sidebar-toggle span { margin: 0; font-size: 22px; }
.sidebar-toggle:hover { background: var(--active); }
.sidebar-toggle:focus-visible { outline: 2px solid #fff; outline-offset: 2px; }
.sidebar-collapsed { --sidebar-width: 68px; }
.sidebar-collapsed .brand { min-height: 66px; padding: 0 16px; }
.sidebar-collapsed .brand-copy,
.sidebar-collapsed .nav-item > span:not(.icon) { display: none; }
.sidebar-collapsed .main-nav { padding-left: 7px; padding-right: 7px; }
.sidebar-collapsed .nav-item {
    grid-template-columns: 1fr;
    justify-items: center;
    padding: 0;
}
.sidebar-collapsed .catalog-links { margin-left: 0; border-left: 0; background: rgba(0, 0, 0, .15); }
.sidebar-collapsed .catalog-links .nav-item { min-height: 40px; }