.sidebar {
    grid-row: 1 / 3;
    display: flex;
    flex-direction: column;
    background: var(--glass-sidebar-bg);
    backdrop-filter: blur(var(--glass-sidebar-blur)) saturate(180%);
    -webkit-backdrop-filter: blur(var(--glass-sidebar-blur)) saturate(180%);
    border-right: 1px solid var(--border-light);
    overflow: hidden;
    z-index: 10;
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-lg);
    padding-bottom: var(--space-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    cursor: pointer;
    transition: opacity var(--duration-fast) var(--ease-out);
}

.logo:hover {
    opacity: 0.8;
}

.logo-icon-default {
    width: 32px;
    height: 32px;
    color: var(--text-tertiary);
}

.logo-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    object-fit: cover;
}

.logo-text {
    font-size: var(--text-xl);
    font-weight: 700;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.search-box {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin: 0 var(--space-md);
    padding: var(--space-sm) var(--space-md);
    background: rgba(255, 255, 255, 0.06);
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    transition: all var(--duration-fast) var(--ease-out);
}

.search-box:focus-within {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--border-light);
}

.search-icon {
    width: 16px;
    height: 16px;
    color: var(--text-tertiary);
    flex-shrink: 0;
}

.search-input {
    flex: 1;
    font-size: var(--text-sm);
    color: var(--text-primary);
}

.search-input::placeholder {
    color: var(--text-tertiary);
}

.nav-menu {
    display: flex;
    flex-direction: column;
    padding: var(--space-md);
    gap: var(--space-xs);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: var(--text-sm);
    font-weight: 500;
    transition: all var(--duration-fast) var(--ease-out);
    position: relative;
}

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

.nav-item.active {
    color: var(--text-primary);
    background: var(--accent-primary-muted);
}

.nav-item.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 3px;
    height: 20px;
    background: var(--accent-primary);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.nav-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* 返回导航项 */
.nav-item.back-nav {
    display: none;
    margin-top: var(--space-sm);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding-top: var(--space-md);
    color: var(--accent-primary);
}

.nav-item.back-nav:hover {
    background: rgba(var(--accent-rgb), 0.1);
}

.nav-item.back-nav .nav-icon {
    transition: transform 0.2s ease;
}

.nav-item.back-nav:hover .nav-icon {
    transform: translateX(-3px);
}