.top-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.menu-toggle {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 6px;
    color: var(--text-white);
    font-size: 1rem;
    cursor: pointer;
    padding: 6px 10px;
    transition: var(--transition);
}

.menu-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
}

.app-title {
    color: var(--text-white);
    font-size: 0.95rem;
    font-weight: 600;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-white);
    background: rgba(255, 255, 255, 0.1);
    padding: 5px 14px;
    border-radius: 20px;
    font-size: 0.85rem;
}

.sidebar {
    position: fixed;
    left: 0;
    top: var(--header-height);
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    background-color: var(--sidebar-bg);
    box-shadow: 2px 0 20px rgba(0, 0, 0, 0.15);
    transition: var(--transition);
    z-index: 999;
    display: flex;
    flex-direction: column;
}

.sidebar.collapsed {
    transform: translateX(-100%);
}

.sidebar-header {
    padding: 14px 18px;
    background-color: var(--primary-dark);
    color: var(--text-white);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.8rem;
    font-weight: 600;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    flex-shrink: 0;
    cursor: pointer;
}

.sidebar-header:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.sidebar-menu {
    list-style: none;
    padding: 8px 0;
    flex: 1;
    overflow-y: auto;
}

.menu-item {
    position: relative;
}

.menu-item a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 18px;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition);
    font-size: 0.82rem;
}

.menu-item:hover > a {
    background-color: rgba(255, 255, 255, 0.08);
    color: var(--text-white);
}

.menu-item.active a {
    background-color: rgba(255, 255, 255, 0.12);
    color: var(--text-white);
    border-left: 4px solid var(--accent-color);
}

.menu-item i {
    font-size: 0.85rem;
    width: 20px;
    text-align: center;
    color: var(--accent-light);
}

.main-content {
    margin-left: var(--sidebar-width);
    margin-top: var(--header-height);
    padding: 20px;
    width: calc(100% - var(--sidebar-width));
    min-height: calc(100vh - var(--header-height));
    transition: var(--transition);
}

.main-content.expanded {
    margin-left: 0;
    width: 100%;
}

.content-wrapper {
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
        width: 100%;
        padding: 12px;
    }
}