.staff-nav-shell {
    position: fixed;
    inset: 0;
    z-index: 1200;
    pointer-events: none;
}

.staff-nav-trigger {
    position: fixed;
    top: 18px;
    left: 18px;
    width: 42px;
    height: 42px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    background: var(--surface-card);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    z-index: 1201;
}

.staff-nav-trigger.is-header-bound {
    position: absolute;
    top: 50%;
    left: 0;
    transform: translateY(-50%);
}

.staff-nav-trigger.is-hidden {
    opacity: 0;
    pointer-events: none;
}

.staff-nav-icon,
.staff-nav-link-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.staff-nav-icon svg,
.staff-nav-link-icon svg {
    width: 20px;
    height: 20px;
    stroke: currentColor;
    stroke-width: 1.9;
    fill: none;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.staff-nav-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(15, 23, 42, 0.36);
    opacity: 0;
    transition: opacity 0.2s ease;
}

.staff-nav-shell.is-open .staff-nav-backdrop {
    opacity: 1;
    pointer-events: auto;
}

.staff-nav-rail {
    position: absolute;
    top: 18px;
    left: 18px;
    width: min(320px, calc(100vw - 32px));
    height: calc(100% - 36px);
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(248, 250, 252, 0.98)),
        var(--surface-card);
    border: 1px solid rgba(148, 163, 184, 0.22);
    border-right: 1px solid rgba(148, 163, 184, 0.22);
    border-radius: 24px;
    box-shadow: var(--shadow-lg);
    display: grid;
    grid-template-rows: auto auto 1fr auto;
    pointer-events: auto;
    overflow: hidden;
    backdrop-filter: blur(16px);
    transform: translateX(-110%);
    transition: transform 0.22s ease;
}

:root[data-theme="dark"] .staff-nav-rail {
    background:
        linear-gradient(180deg, rgba(15, 23, 42, 0.94), rgba(17, 24, 39, 0.96)),
        var(--surface-card);
}

.staff-nav-shell.is-open .staff-nav-rail {
    transform: translateX(0);
}

.staff-nav-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 18px 18px 16px;
    border-bottom: 1px solid var(--border-subtle);
}

.staff-nav-title {
    display: grid;
    gap: 4px;
}

.staff-nav-brand {
    display: block;
    height: 22px;
    width: auto;
}

.staff-nav-title span {
    color: var(--text-secondary);
    font-size: 0.84rem;
}

.staff-nav-close {
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-subtle);
    border-radius: 10px;
    background: var(--surface-card-muted);
    color: var(--text-primary);
    cursor: pointer;
    flex: 0 0 auto;
}

.staff-nav-trigger:hover,
.staff-nav-trigger:focus-visible,
.staff-nav-close:hover,
.staff-nav-close:focus-visible {
    background: var(--surface-hover);
    border-color: var(--border-strong);
    outline: none;
}

.staff-nav-session {
    display: grid;
    gap: 2px;
    padding: 16px 18px;
    border-bottom: 1px solid var(--border-subtle);
}

.staff-nav-session strong {
    overflow-wrap: anywhere;
}

.staff-nav-session span {
    color: var(--text-secondary);
    font-size: 0.86rem;
}

.staff-nav-section {
    padding: 16px 12px;
}

.staff-nav-section-label {
    color: var(--text-muted);
    font-size: 0.74rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    padding: 0 10px 8px;
}

.staff-nav-links {
    display: grid;
    gap: 4px;
}

.staff-nav-link {
    display: grid;
    grid-template-columns: 36px minmax(0, 1fr);
    align-items: start;
    gap: 10px;
    padding: 12px 12px;
    border-radius: 12px;
    color: var(--text-primary);
    text-decoration: none;
    transition: background-color 0.2s ease, color 0.2s ease;
}

.staff-nav-link:hover,
.staff-nav-link:focus-visible {
    background: var(--surface-hover);
    outline: none;
}

.staff-nav-link.is-active {
    background: rgba(37, 99, 235, 0.1);
}

.staff-nav-link.is-active .staff-nav-link-icon {
    background: rgba(37, 99, 235, 0.16);
    color: var(--primary-color);
}

.staff-nav-link strong {
    font-size: 0.96rem;
}

.staff-nav-link-copy {
    display: grid;
    gap: 2px;
}

.staff-nav-link-copy span {
    color: var(--text-secondary);
    font-size: 0.82rem;
}

.staff-nav-link-icon {
    width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    background: var(--surface-card-muted);
    color: var(--text-primary);
}

.staff-nav-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
    padding: 16px 18px 20px;
    border-top: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    font-size: 0.84rem;
}

.staff-nav-footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 700;
}

@media (max-width: 900px) {
    .staff-nav-trigger.is-header-bound {
        position: fixed;
        top: 18px;
        left: 18px;
        transform: none;
    }
}