/* Header Styles */
.app-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 2rem;
    background-color: var(--background-color);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.app-header h1 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-color);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Header Responsive */
@media (max-width: 768px) {
    .app-header {
        padding: 1rem;
    }

    .app-header h1 {
        font-size: 1.25rem;
    }

    .header-actions {
        gap: 0.5rem;
    }
}

/* Header Dark Mode */
.app-header.dark {
    background-color: #1a1a1a;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.app-header.dark h1 {
    color: #fff;
}

/* Header Transparent */
.app-header.transparent {
    background-color: transparent;
    box-shadow: none;
}

/* Header with Background Image */
.app-header.with-bg {
    background-image: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('../images/header-bg.jpg');
    background-size: cover;
    background-position: center;
    color: #fff;
}

.app-header.with-bg h1 {
    color: #fff;
}

/* Header with Border */
.app-header.with-border {
    border-bottom: 1px solid var(--border-color);
}

/* Header with Gradient */
.app-header.with-gradient {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
}

.app-header.with-gradient h1 {
    color: #fff;
}

/* Header with Logo */
.app-header .logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.app-header .logo img {
    height: 40px;
    width: auto;
}

/* Header Navigation */
.app-header .nav {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.app-header .nav-link {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.app-header .nav-link:hover {
    color: var(--primary-color);
}

/* Header Search */
.app-header .search {
    position: relative;
    width: 300px;
}

.app-header .search input {
    width: 100%;
    padding: 0.5rem 1rem;
    padding-right: 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    font-size: 0.875rem;
}

.app-header .search button {
    position: absolute;
    right: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
}

/* Header Notifications */
.app-header .notifications {
    position: relative;
}

.app-header .notifications-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background-color: var(--secondary-color);
    color: #fff;
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 1rem;
}

/* Header User Menu */
.app-header .user-menu {
    position: relative;
}

.app-header .user-menu-button {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: none;
    border: none;
    cursor: pointer;
}

.app-header .user-menu-button img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
}

.app-header .user-menu-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background-color: var(--background-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    min-width: 200px;
    display: none;
}

.app-header .user-menu-dropdown.show {
    display: block;
}

.app-header .user-menu-item {
    display: block;
    padding: 0.75rem 1rem;
    color: var(--text-color);
    text-decoration: none;
    transition: background-color var(--transition-fast);
}

.app-header .user-menu-item:hover {
    background-color: #f8f9fa;
}