.app-shell {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    position: sticky;
    top: 0;
    height: 100vh;
    background: linear-gradient(180deg, var(--color-black-900) 0%, var(--color-black-950) 60%);
    border-right: 1px solid var(--color-line);
    display: flex;
    flex-direction: column;
    padding: 24px 18px;
    overflow: hidden;
}

.sidebar::before {
    content: '';
    position: absolute;
    top: -120px;
    left: -60px;
    width: 280px;
    height: 280px;
    background: radial-gradient(circle, var(--color-red-glow) 0%, transparent 70%);
    pointer-events: none;
}

.brand {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 6px 8px 28px;
    position: relative;
}

.brand-logo {
    width: 100%;
    max-width: 140px;
    height: auto;
    border-radius: var(--radius-sm);
}

.brand-name {
    font-weight: 700;
    font-size: 0.85rem;
    letter-spacing: 0.02em;
    color: var(--color-white);
    text-align: center;
}

.nav-section-title {
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--color-text-faint);
    padding: 18px 12px 8px;
}

.nav-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    color: var(--color-text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    position: relative;
    transition: background-color 0.15s ease, color 0.15s ease;
}

.nav-link svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
    opacity: 0.85;
}

.nav-link:hover {
    background: var(--color-black-700);
    color: var(--color-white);
}

.nav-link.is-active {
    background: linear-gradient(90deg, rgba(216, 27, 44, 0.16), transparent);
    color: var(--color-white);
}

.nav-link.is-active::before {
    content: '';
    position: absolute;
    left: -18px;
    top: 6px;
    bottom: 6px;
    width: 3px;
    border-radius: var(--radius-pill);
    background: var(--color-red-500);
}

.nav-link.is-disabled {
    color: var(--color-text-faint);
    cursor: default;
    opacity: 0.55;
}

.nav-link.is-disabled:hover {
    background: transparent;
    color: var(--color-text-faint);
}

.nav-soon {
    margin-left: auto;
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    background: var(--color-black-700);
    color: var(--color-text-faint);
    padding: 2px 7px;
    border-radius: var(--radius-pill);
}

.sidebar-footer {
    margin-top: auto;
    padding: 14px 12px;
    border-top: 1px solid var(--color-line);
    font-size: 0.72rem;
    color: var(--color-text-faint);
}

/* Main column */
.app-main {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.topbar {
    height: var(--topbar-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    border-bottom: 1px solid var(--color-line);
    background: var(--color-black-950);
    position: sticky;
    top: 0;
    z-index: 20;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    color: var(--color-text-faint);
}

.breadcrumb a {
    transition: color 0.15s ease;
}

.breadcrumb a:hover {
    color: var(--color-white);
}

.breadcrumb strong {
    color: var(--color-white);
    font-weight: 600;
}

.topbar-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    background: var(--color-red-500);
    color: var(--color-white);
    padding: 6px 12px;
    border-radius: var(--radius-pill);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.topbar-badge:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 20px -8px var(--color-red-glow);
}

.topbar-badge .dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--color-white);
}

.content {
    flex: 1;
    width: 100%;
    padding: 32px 48px 64px;
}

.content-inner {
    max-width: 1440px;
    margin-inline: auto;
}

.page-header {
    margin-bottom: 24px;
}

@media (max-width: 960px) {
    .app-shell {
        grid-template-columns: 1fr;
    }

    .sidebar {
        display: none;
    }
}