/* defines the sidebar, topbar, page structure, grids, and responsive layouts */

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

.sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 20;

    width: var(--sidebar-width);
    padding: 20px;

    background: rgb(23 27 36 / 94%);
    border-right: 1px solid var(--color-border);
    backdrop-filter: blur(18px);
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: 42px;
    margin-bottom: 24px;

    font-size: 1.25rem;
    font-weight: 850;
    letter-spacing: -0.04em;
}

.sidebar-logo-mark {
    display: grid;
    width: 38px;
    height: 38px;
    place-items: center;

    background: var(--color-primary);
    color: var(--color-text-dark);
    border-radius: 12px;
}

.sidebar-nav {
    display: grid;
    gap: 7px;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 11px;
    min-height: 44px;
    padding: 0 13px;

    color: var(--color-text-muted);
    border-radius: var(--radius-medium);

    transition:
        background var(--transition-fast),
        color var(--transition-fast),
        transform var(--transition-fast);
}

.sidebar-link:hover {
    background: var(--color-surface-light);
    color: var(--color-text);
    transform: translateX(2px);
}

.sidebar-link.is-active {
    background: rgb(75 185 233 / 14%);
    color: var(--color-primary);
}

.app-main {
    min-width: 0;
    min-height: 100vh;
    margin-left: var(--sidebar-width);
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 10;

    display: flex;
    min-height: var(--topbar-height);
    align-items: center;
    justify-content: flex-end;
    gap: 16px;
    padding: 0 28px;

    background: rgb(15 18 24 / 82%);
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(16px);
}

.topbar-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.page-content {
    width: min(1500px, 100%);
    margin: 0 auto;
    padding: 30px 28px 64px;
}

.content-grid {
    display: grid;
    gap: 18px;
}

.content-grid.two-columns {
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

.content-grid.three-columns {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.content-grid.four-columns {
    grid-template-columns: repeat(4, minmax(0, 1fr));
}

@media (max-width: 980px) {
    .sidebar {
        position: sticky;
        top: 0;

        width: 100%;
        height: auto;
        padding: 12px 16px;

        border-right: 0;
        border-bottom: 1px solid var(--color-border);
    }

    .sidebar-logo {
        margin-bottom: 10px;
    }

    .sidebar-nav {
        display: flex;
        overflow-x: auto;
        padding-bottom: 3px;
    }

    .sidebar-link {
        flex: 0 0 auto;
    }

    .app-main {
        margin-left: 0;
    }

    .content-grid.three-columns,
    .content-grid.four-columns {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .topbar {
        min-height: 64px;
        padding: 0 16px;
    }

    .page-content {
        padding: 22px 16px 48px;
    }

    .content-grid.two-columns,
    .content-grid.three-columns,
    .content-grid.four-columns {
        grid-template-columns: 1fr;
    }
}