.app-shell {
    display: grid;
    grid-template-columns: 260px minmax(0, 1fr);
    min-height: 100vh;
    gap: 18px;
    padding: 18px;
}

.sidebar {
    position: sticky;
    top: 18px;
    height: calc(100vh - 36px);
    display: flex;
    flex-direction: column;
    padding: 20px;
    background:
        linear-gradient(180deg, rgba(15, 39, 72, 0.96), rgba(7, 18, 35, 0.96)),
        var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 28px;
}

.brand-mark {
    width: 46px;
    height: 46px;
    display: grid;
    place-items: center;
    flex: 0 0 46px;
    color: var(--color-text-strong);
    background: linear-gradient(135deg, var(--color-primary), var(--color-cyan));
    border-radius: var(--radius-md);
    font-weight: 900;
    box-shadow: 0 12px 28px rgba(33, 212, 253, 0.24);
}

.brand h1 {
    color: var(--color-text-strong);
    font-size: 1.28rem;
    line-height: 1.1;
}

.brand p {
    margin-top: 4px;
    color: var(--color-muted);
    font-size: 0.82rem;
}

.sidebar-nav {
    display: grid;
    gap: 8px;
}

.nav-item {
    min-height: 46px;
    display: flex;
    align-items: center;
    gap: 11px;
    padding: 11px 12px;
    color: var(--color-muted-strong);
    background: transparent;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    font-weight: 800;
    text-align: left;
    transition: var(--transition-fast);
}

.nav-icon {
    width: 26px;
    height: 26px;
    display: grid;
    place-items: center;
    color: var(--color-cyan);
    background: rgba(33, 212, 253, 0.10);
    border-radius: var(--radius-sm);
}

.nav-item:hover,
.nav-item.active {
    color: var(--color-text-strong);
    background: linear-gradient(135deg, rgba(47, 107, 255, 0.28), rgba(33, 212, 253, 0.10));
    border-color: var(--color-border-strong);
}

.sidebar-footer {
    margin-top: auto;
    padding-top: 18px;
    border-top: 1px solid var(--color-border);
    display: grid;
    gap: 4px;
}

.sidebar-footer span {
    color: var(--color-muted);
    font-size: 0.78rem;
    text-transform: uppercase;
    font-weight: 900;
}

.sidebar-footer strong {
    color: var(--color-text-strong);
    font-size: 0.94rem;
}

.main-content {
    display: flex;
    min-width: 0;
    flex-direction: column;
    gap: 16px;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 18px;
    padding: 20px 22px;
    background: rgba(12, 28, 52, 0.78);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-soft);
    backdrop-filter: blur(18px);
}

.page-heading {
    min-width: 0;
}

.eyebrow,
.panel-kicker {
    display: block;
    color: var(--color-cyan);
    font-size: 0.75rem;
    font-weight: 900;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.topbar h2 {
    margin-top: 5px;
    color: var(--color-text-strong);
    font-size: 1.8rem;
    line-height: 1.08;
}

.topbar p {
    margin-top: 5px;
    color: var(--color-muted);
}

.topbar-actions {
    width: min(520px, 45%);
}

.page-section {
    display: none;
}

.page-section.active {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.hero-panel {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 22px;
    padding: 24px;
    background:
        linear-gradient(135deg, rgba(47, 107, 255, 0.22), rgba(33, 212, 253, 0.08)),
        rgba(12, 28, 52, 0.92);
    border: 1px solid var(--color-border-strong);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-glow), var(--shadow-soft);
}

.hero-panel h3 {
    max-width: 760px;
    margin-top: 8px;
    color: var(--color-text-strong);
    font-size: clamp(1.35rem, 2.8vw, 2.2rem);
    line-height: 1.08;
}

.hero-panel p {
    max-width: 680px;
    margin-top: 10px;
    color: var(--color-muted-strong);
}

.hero-stats {
    min-width: 170px;
    padding: 18px;
    text-align: right;
    background: rgba(3, 11, 24, 0.38);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
}

.hero-stats span {
    display: block;
    color: var(--color-text-strong);
    font-size: 1.35rem;
    font-weight: 900;
}

.hero-stats small {
    color: var(--color-cyan);
    font-weight: 800;
}

.metric-grid {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 12px;
}

.dashboard-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.45fr) minmax(320px, 0.8fr);
    gap: 16px;
    align-items: start;
}

.dashboard-grid .panel-feature {
    min-height: 420px;
}

.dashboard-grid .panel:nth-child(4) {
    grid-column: 1 / -1;
}

.section-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(330px, 0.75fr);
    gap: 16px;
    align-items: start;
}

.analytics-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.dashboard-grid > *,
.section-grid > *,
.analytics-grid > * {
    min-width: 0;
}