/* ========================================
   Sidebar
   ======================================== */
.sidebar-container {
    width: var(--sidebar-width);
    height: 100%;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-primary);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    position: relative;
    transition: margin-left var(--transition-base);
}

.sidebar-container.collapsed {
    margin-left: calc(-1 * var(--sidebar-width));
}

/* Sidebar Top Header - Logo, Brand Name, Close Button */
.sidebar-header-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border-secondary);
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-logo-img {
    width: 32px;
    height: 32px;
    object-fit: contain;
    display: block;
}

.sidebar-logo-fallback {
    display: none;
    width: 32px;
    height: 32px;
    align-items: center;
    justify-content: center;
    color: var(--accent-primary);
}

.sidebar-logo-fallback i {
    width: 28px;
    height: 28px;
}

.sidebar-brand-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

/* Sidebar Close Button */
.sidebar-close-btn {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.sidebar-close-btn:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.sidebar-close-btn i {
    width: 18px;
    height: 18px;
}

.sidebar {
    display: flex;
    flex-direction: column;
    height: 100%;
    padding: 16px;
    padding-top: 12px;
}

/* New Chat Button */
.new-chat-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 16px;
    margin-bottom: 20px;
    background-color: var(--bg-primary);
    border: 1px solid var(--border-primary);
    color: var(--text-primary);
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.new-chat-btn:hover {
    background-color: var(--bg-hover);
    border-color: var(--text-tertiary);
}

.new-chat-btn i {
    width: 16px;
    height: 16px;
}

/* Sidebar Content */
.sidebar-content {
    flex-grow: 1;
    overflow-y: auto;
    overflow-x: hidden;
}

.sidebar-content::-webkit-scrollbar {
    width: 4px;
}

.sidebar-content::-webkit-scrollbar-thumb {
    background-color: var(--border-primary);
    border-radius: 2px;
}

.sidebar-section-title {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0 8px;
    margin-bottom: 8px;
}

.conversations-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.conversation-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-secondary);
    transition: all var(--transition-fast);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conversation-item:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.conversation-item.active {
    background-color: var(--accent-light);
    color: var(--accent-primary);
}

.conversation-item i {
    flex-shrink: 0;
    width: 16px;
    height: 16px;
}

.conversation-item span {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* Sidebar Footer */
.sidebar-footer {
    border-top: 1px solid var(--border-primary);
    padding-top: 12px;
    margin-top: auto;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.footer-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 12px;
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 6px;
    font-size: 0.875rem;
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-fast);
}

.footer-item:hover {
    background-color: var(--bg-hover);
    color: var(--text-primary);
}

.footer-item i {
    width: 18px;
    height: 18px;
}