frontend/src/components/Layout/Sidebar.css

/* ============================================================
   SIDEBAR — Dark-themed navigation shell
   ============================================================ */

/* ── Mobile overlay ── */
.sb-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(4px);
    z-index: 90;
    opacity: 0;
    transition: opacity 0.3s;
}

.sb-overlay-visible {
    opacity: 1;
}

/* ── Sidebar container ── */
.sb-sidebar {
    width: 260px;
    height: 100%;
    display: flex;
    flex-direction: column;
    background: var(--surface-color);
    border-right: 1px solid var(--border-color);
    flex-shrink: 0;
    z-index: 100;
    overflow: hidden;
}

/* ── Header with logo ── */
.sb-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.25rem 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.sb-logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
    transition: opacity 0.2s;
}

.sb-logo:hover {
    opacity: 0.85;
}

.sb-logo-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.3);
    flex-shrink: 0;
}

.sb-logo-text {
    font-size: 0.95rem;
    font-weight: 800;
    letter-spacing: -0.3px;
    color: var(--text-primary);
}

.sb-logo-text span {
    background: linear-gradient(90deg, var(--accent-1), var(--accent-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Close button — hidden on desktop */
.sb-close-btn {
    display: none;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: 8px;
    color: var(--text-muted);
    transition: color 0.2s, background 0.2s;
}

.sb-close-btn:hover {
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.06);
}

/* ── Navigation links ── */
.sb-nav {
    flex: 1;
    padding: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    overflow-y: auto;
}

.sb-nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.7rem 0.85rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-md, 10px);
    font-size: 0.88rem;
    font-weight: 500;
    border: none;
    background: none;
    width: 100%;
    cursor: pointer;
    transition: color 0.2s, background 0.2s;
    white-space: nowrap;
}

.sb-nav-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.sb-nav-item.sb-active {
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-1);
}

.sb-nav-item.sb-active svg {
    color: var(--accent-1);
}

.sb-nav-item:focus-visible {
    outline: 2px solid var(--accent-1, #6366f1);
    outline-offset: -2px;
}

/* ── Footer — profile + logout ── */
.sb-footer {
    padding: 0.75rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.sb-profile-item {
    gap: 0.65rem;
    padding: 0.6rem 0.85rem;
}

.sb-avatar {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 0.8rem;
    font-weight: 700;
    flex-shrink: 0;
}

.sb-profile-info {
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.sb-profile-name {
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sb-profile-email {
    font-size: 0.72rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* ── Logout button ── */
.sb-logout-btn {
    color: var(--text-muted);
    font-size: 0.84rem;
}

.sb-logout-btn:hover {
    color: #f87171;
    background: rgba(248, 113, 113, 0.08);
}

/* ── Responsive ── */

@media (max-width: 768px) {
    .sb-overlay {
        display: block;
        pointer-events: none;
    }

    .sb-overlay-visible {
        pointer-events: auto;
    }

    .sb-sidebar {
        position: fixed;
        top: 0;
        left: 0;
        height: 100vh;
        transform: translateX(-100%);
        transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: var(--shadow-lg);
    }

    .sb-sidebar.sb-open {
        transform: translateX(0);
    }

    .sb-close-btn {
        display: flex;
    }
}