/* --- Styles for Product Listing Page --- */

/* Tiêu đề trang */
.page-header {
    position: relative;
    background-size: cover;
    background-position: center;
    padding: 150px 0;
    margin-top: 80px; /* Bù cho header fixed */
    text-align: center;
}

.page-header-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
}

.page-header h1 {
    position: relative;
    z-index: 2;
    font-size: 4rem;
    letter-spacing: 3px;
}

/* Mô tả công việc */
.work-description {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 60px auto;
    font-size: 1.1rem;
    color: var(--light-text-color);
}

/* Menu lọc */
.filter-menu {
    text-align: center;
    margin-bottom: 50px;
}

.filter-btn {
    background: none;
    border: none;
    color: var(--light-text-color);
    font-family: 'Montserrat', sans-serif;
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    margin: 5px 15px; /* Thêm margin top/bottom cho mobile */
    padding: 10px 0;
    cursor: pointer;
    position: relative;
    transition: color 0.3s ease;
}

.filter-btn::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

.filter-btn:hover,
.filter-btn.active {
    color: var(--primary-color);
}

.filter-btn.active::after {
    width: 100%;
}

/* --- Portfolio Grid & Items --- */

.portfolio-item-link {
    text-decoration: none;
    display: block; 
}

.portfolio-item {
    position: relative;
    overflow: hidden;
    transition: transform 0.4s ease, opacity 0.4s ease;
    border-radius: 8px; /* Thêm bo góc */
}

/* Animation cho portfolio item khi lọc */
.portfolio-item.hide {
    transform: scale(0.8);
    opacity: 0;
    display: none;
}

/* Lớp phủ màu đen mờ khi hover */
.portfolio-item::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.6);
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: 1;
}

.portfolio-item-link:hover .portfolio-item::after {
    opacity: 1;
}

/* Style cho tên dự án */
.portfolio-title {
    position: absolute;
    bottom: 20px;
    left: 20px;
    right: 20px;
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: 700;
    text-transform: uppercase;
    text-align: left;
    
    /* Hiệu ứng ẩn/hiện */
    opacity: 0;
    transform: translateY(10px);
    transition: opacity 0.4s ease, transform 0.4s ease;
    z-index: 2;
}

/* Hiện tên dự án khi hover */
.portfolio-item-link:hover .portfolio-title {
    opacity: 1;
    transform: translateY(0);
}

/* Thêm hiệu ứng zoom nhẹ cho ảnh khi hover */
.portfolio-item-link:hover .portfolio-item img {
    transform: scale(1.05);
}