/* 基础样式 */
:root {
    --primary-color: #333;
    --secondary-color: #666;
    --accent-color: #4a90e2;
    --background-color: #fff;
    --text-color: #333;
    --light-gray: #f5f5f5;
    --medium-gray: #e0e0e0;
    --dark-gray: #888;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --border-radius: 4px;
    --transition-speed: 0.3s;
    --max-width: 1400px;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-speed) ease;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
    transition: all 0.3s ease;
    border-radius: 12px;
}

img:hover {
    transform: scale(1.02);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* 导航栏样式 */
header {
    padding: var(--spacing-sm) var(--spacing-md);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.98);
    z-index: 100;
    box-shadow: none;
    transition: all 0.3s ease;
    border-bottom: 1px solid #e0e0e0;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: var(--max-width);
    margin: 0 auto;
    height: 48px;
}

.nav-left, .nav-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.nav-link {
    margin-right: var(--spacing-md);
    font-weight: 400;
    position: relative;
    padding: var(--spacing-sm) var(--spacing-xs);
    letter-spacing: 0.2px;
    font-size: 0.95rem;
    color: var(--secondary-color);
    transition: all 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 8px;
    background-color: #53A6FD;
    opacity: 0;
    transform: scaleX(0);
    transform-origin: center;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 0;
    z-index: -1;
}

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

.nav-link:hover::after {
    opacity: 0.3;
    transform: scaleX(1.1);
}

.nav-link.active {
    color: var(--primary-color);
}

.social-link {
    margin-left: calc(var(--spacing-sm) * 1.2);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xs);
    border-radius: 50%;
    transition: all 0.3s ease;
    width: 42px;
    height: 42px;
    border: 1.5px solid #f0f0f0;
}

.social-icon {
    width: 26px;
    height: 26px;
    opacity: 0.9;
    transition: all 0.3s ease;
    stroke: #222;
    fill: none;
    color: #222;
}

.social-icon path,
.social-icon circle,
.social-icon rect,
.social-icon line {
    stroke-width: 3 !important;
    stroke: currentColor;
    vector-effect: non-scaling-stroke;
}

.social-link:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.social-link:hover .social-icon {
    opacity: 1;
    stroke: #fff;
    color: #fff;
    fill: #fff;
    filter: brightness(0) invert(1);
}

.social-link:hover .social-icon path,
.social-link:hover .social-icon circle,
.social-link:hover .social-icon rect,
.social-link:hover .social-icon line {
    stroke-width: 3 !important;
    stroke: currentColor;
    vector-effect: non-scaling-stroke;
}

.social-link:hover .social-icon * {
    stroke: #fff !important;
    fill: #fff !important;
    color: #fff !important;
}

.social-link:hover .social-icon svg {
    stroke: #fff !important;
    fill: #fff !important;
    color: #fff !important;
}

.social-link:hover .social-icon svg * {
    stroke: #fff !important;
    fill: #fff !important;
    color: #fff !important;
}

/* 首页作品集样式 */
main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-md);
    padding-top: 80px;
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
    margin-top: 0;
}

.portfolio-item {
    position: relative;
    overflow: hidden;
    border-radius: 12px;
    box-shadow: none;
}

.portfolio-image {
    aspect-ratio: 16/9;
    object-fit: cover;
    width: 100%;
    transition: all 0.3s ease;
    border-radius: 12px;
}

.portfolio-image:hover {
    transform: scale(1.02);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    border-radius: 12px;
}

/* 作品详情页样式 */
.work-detail {
    margin-top: var(--spacing-lg);
}

/* 作品页的 main 元素特殊样式 */
.work-detail-page main {
    padding: var(--spacing-md) 6rem;
    padding-top: 80px;
}

.work-header {
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.work-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    letter-spacing: -0.5px;
}

.work-meta {
    color: var(--secondary-color);
    font-size: 1.1rem;
}

.work-image-container {
    margin-bottom: var(--spacing-lg);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.work-image {
    width: 100%;
    height: auto;
    transition: all 0.3s ease;
    border-radius: 12px;
}

.work-image:hover {
    transform: scale(1.02);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.work-description {
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
    padding: 0 var(--spacing-md);
}

.work-description h2 {
    margin: var(--spacing-md) 0 var(--spacing-sm);
    font-size: 1.8rem;
    font-weight: 600;
}

.work-description p {
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
    line-height: 1.8;
    color: var(--secondary-color);
}

.work-gallery {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    margin: 0;
}

.gallery-image {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 12px;
    transition: all 0.3s ease;
}

.gallery-image:hover {
    transform: scale(1.02);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

.work-navigation {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-md) 0;
    border-top: 1px solid var(--medium-gray);
    margin-top: var(--spacing-lg);
}

.back-link, .next-link {
    display: flex;
    align-items: center;
    color: var(--secondary-color);
    font-weight: 500;
    transition: color var(--transition-speed) ease;
}

.back-link:hover, .next-link:hover {
    color: var(--accent-color);
}

.back-link i {
    margin-right: var(--spacing-xs);
}

.next-link i {
    margin-left: var(--spacing-xs);
}

/* 响应式设计 */
@media (max-width: 1200px) {
    :root {
        --spacing-lg: 2.5rem;
        --spacing-xl: 4rem;
    }
    
    .portfolio-grid {
        gap: var(--spacing-md);
    }
}

@media (max-width: 992px) {
    .portfolio-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--spacing-md);
    }
}

@media (max-width: 768px) {
    header {
        padding: var(--spacing-xs) var(--spacing-sm);
    }
    
    main {
        padding: var(--spacing-sm);
        padding-top: 60px;
    }
    
    .work-detail-page main {
        padding: var(--spacing-sm);
        padding-top: 60px;
    }
    
    .portfolio-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }
    
    .work-gallery {
        gap: var(--spacing-sm);
    }
    
    .work-title {
        font-size: 2rem;
    }
    
    .nav-link {
        margin-right: var(--spacing-sm);
        font-size: 0.85rem;
    }
    
    .social-link {
        margin-left: var(--spacing-sm);
        padding: calc(var(--spacing-xs) * 0.5);
        width: 36px;
        height: 36px;
    }
    
    .nav-right {
        gap: var(--spacing-sm);
    }
    
    .social-icon {
        width: 22px;
        height: 22px;
    }
    
    .social-icon path,
    .social-icon circle,
    .social-icon rect,
    .social-icon line {
        stroke-width: 3 !important;
    }
    
    .nav-link::after {
        bottom: -2px;
        height: 6px;
        border-radius: 0;
    }
    
    .work-detail {
        padding: 0;
    }
}

@media (max-width: 480px) {
    .nav-link {
        margin-right: var(--spacing-sm);
        font-size: 0.9rem;
    }
    
    .social-link {
        margin-left: calc(var(--spacing-xs) * 1.2);
        padding: calc(var(--spacing-xs) * 0.5);
        width: 36px;
        height: 36px;
    }
    
    .nav-right {
        gap: var(--spacing-sm);
    }
    
    .work-title {
        font-size: 1.5rem;
    }
    
    .work-meta {
        font-size: 0.9rem;
    }
    
    .work-description h2 {
        font-size: 1.4rem;
    }
    
    .work-description p {
        font-size: 1rem;
    }
    
    .social-icon {
        width: 22px;
        height: 22px;
    }
    
    .social-icon path,
    .social-icon circle,
    .social-icon rect,
    .social-icon line {
        stroke-width: 3 !important;
    }
    
    .nav-link::after {
        bottom: -2px;
        height: 6px;
        border-radius: 0;
    }
}