/* ============================================================
   2-layout / sidebar.css
   桌面侧边栏导航
   来源：website-complete / styles.css L78–297
   ============================================================ */

/* ===== Sidebar ===== */
.sidebar {
    position: fixed;
    left: 0; top: 0; bottom: 0;
    width: var(--sidebar-width);
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border-light);
    display: flex;
    flex-direction: column;
    z-index: 100;
}

.sidebar-logo {
    height: var(--topbar-height);
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-icon {
    width: 40px; height: 40px;
    background: var(--color-primary);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 11px;
    font-weight: 700;
}

.sidebar-menu {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 8px;
    gap: 4px;
}

.sidebar-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 12px 8px;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 11px;
    transition: var(--transition);
    position: relative;
}

.sidebar-item:hover { background: var(--bg-hover); color: var(--text-primary); }
.sidebar-item.active { color: var(--text-primary); }
.sidebar-item svg { width: 20px; height: 20px; }

/* Submenu Popup */
.sidebar-submenu {
    position: absolute;
    left: calc(100% + 8px);
    top: -20px;
    min-width: 340px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    display: flex;
    opacity: 0;
    visibility: hidden;
    transform: translateX(-8px);
    transition: var(--transition);
    z-index: 200;
}

.sidebar-item:hover .sidebar-submenu {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

.submenu-col { padding: 16px; min-width: 160px; }
.submenu-col + .submenu-col { border-left: 1px solid var(--border-light); }

.submenu-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: var(--text-secondary);
    transition: var(--transition);
}

.submenu-link:hover { background: var(--bg-hover); color: var(--text-primary); }
.submenu-link svg { width: 16px; height: 16px; opacity: 0.6; }

.submenu-link.has-arrow { justify-content: space-between; }
.submenu-link.has-arrow::after {
    content: '';
    width: 5px; height: 5px;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: rotate(-45deg);
    opacity: 0.4;
}

.sidebar-bottom {
    padding: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.sidebar-btn {
    width: 36px; height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: var(--transition);
}

.sidebar-btn:hover { background: var(--bg-hover); color: var(--text-primary); }
.sidebar-btn svg { width: 18px; height: 18px; }

/* Theme Toggle Button */
.theme-toggle-btn .moon-icon { display: none; }
.theme-toggle-btn .sun-icon { display: block; }
[data-theme="dark"] .theme-toggle-btn .moon-icon { display: block; }
[data-theme="dark"] .theme-toggle-btn .sun-icon { display: none; }

.mobile-theme-btn .moon-icon { display: none; }
.mobile-theme-btn .sun-icon { display: block; }
[data-theme="dark"] .mobile-theme-btn .moon-icon { display: block; }
[data-theme="dark"] .mobile-theme-btn .sun-icon { display: none; }

.sidebar-login {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 8px;
    color: var(--text-secondary);
    font-size: 11px;
}

.sidebar-login:hover { color: var(--text-primary); }
.sidebar-login svg { width: 18px; height: 18px; }

/* Sidebar More Menu */
.sidebar-more { position: relative; }

.sidebar-more-menu {
    position: absolute;
    bottom: 0;
    left: calc(100% + 8px);
    display: flex;
    gap: 8px;
    opacity: 0;
    visibility: hidden;
    transform: translateX(-8px);
    transition: var(--transition);
    z-index: 300;
}

.sidebar-more:hover .sidebar-more-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

.sidebar-more-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 8px;
    min-width: 180px;
}

.sidebar-more-sub {
    opacity: 0;
    visibility: hidden;
    transform: translateX(-8px);
    transition: var(--transition);
}

.sidebar-more-item.has-sub:hover ~ .sidebar-more-sub,
.sidebar-more-sub:hover {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

.sidebar-more-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: var(--text-secondary);
    transition: var(--transition);
    white-space: nowrap;
}

.sidebar-more-item:hover { background: var(--bg-hover); color: var(--text-primary); }
.sidebar-more-item svg { width: 16px; height: 16px; opacity: 0.7; }
.sidebar-more-item.has-sub::after {
    content: '';
    margin-left: auto;
    width: 5px; height: 5px;
    border-right: 1.5px solid currentColor;
    border-bottom: 1.5px solid currentColor;
    transform: rotate(-45deg);
    opacity: 0.4;
}


/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .sidebar { display: none; }
}