/* 高端摄影师风格 CSS */
:root {
    --color-black: #000000;
    --color-white: #ffffff;
    --color-gray-100: #f8f9fa;
    --color-gray-200: #e9ecef;
    --color-gray-300: #dee2e6;
    --color-gray-400: #ced4da;
    --color-gray-500: #adb5bd;
    --color-gray-600: #6c757d;
    --color-gray-700: #495057;
    --color-gray-800: #343a40;
    --color-gray-900: #212529;
    
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Playfair Display', Georgia, serif;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    --border-radius: 4px;
    --border-radius-lg: 8px;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--color-gray-900);
    background-color: var(--color-white);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

a {
    text-decoration: none;
    color: inherit;
}

/* 导航栏 */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-gray-200);
    transition: var(--transition-base);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--color-black);
    letter-spacing: -0.02em;
}

.nav-menu {
    display: flex;
    gap: var(--spacing-xl);
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 400;
    color: var(--color-gray-700);
    transition: var(--transition-fast);
    position: relative;
    padding: var(--spacing-xs) 0;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-black);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background-color: var(--color-black);
}

/* 主要内容区域 */
.main {
    margin-top: 80px;
}

/* 英雄区域 */
.hero {
    padding: var(--spacing-3xl) var(--spacing-lg);
    text-align: center;
    background-color: var(--color-gray-100);
    min-height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-content {
    max-width: 800px;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 400;
    color: var(--color-black);
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.03em;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-gray-600);
    font-weight: 300;
    letter-spacing: 0.01em;
    max-width: 600px;
    margin: 0 auto;
}

/* 过滤器部分 */
.filter-section {
    padding: var(--spacing-2xl) var(--spacing-lg);
    border-bottom: 1px solid var(--color-gray-200);
}

.filter-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.filter-btn {
    font-size: 0.95rem;
    font-weight: 400;
    color: var(--color-gray-600);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    transition: var(--transition-fast);
    position: relative;
    background-color: transparent;
}

.filter-btn:hover {
    color: var(--color-black);
    background-color: var(--color-gray-100);
}

.filter-btn.active {
    color: var(--color-black);
    font-weight: 500;
}

.filter-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 20px;
    height: 2px;
    background-color: var(--color-black);
}

/* 画廊部分 */
.gallery-section {
    padding: var(--spacing-3xl) var(--spacing-lg);
}

.gallery-container {
    max-width: 1400px;
    margin: 0 auto;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xl);
    padding: var(--spacing-lg) 0;
}

.gallery-item {
    position: relative;
    cursor: pointer;
    overflow: hidden;
    border-radius: var(--border-radius-lg);
    background-color: var(--color-gray-100);
    transition: var(--transition-slow);
    aspect-ratio: 4/3;
}

.gallery-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.gallery-item:hover img {
    transform: scale(1.05);
}

.gallery-item-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    padding: var(--spacing-lg);
    transform: translateY(100%);
    transition: var(--transition-base);
    color: var(--color-white);
}

.gallery-item:hover .gallery-item-overlay {
    transform: translateY(0);
}

.gallery-item-title {
    font-size: 1.1rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
}

.gallery-item-category {
    font-size: 0.9rem;
    color: var(--color-gray-300);
    font-weight: 300;
}

/* Lightbox */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.95);
    z-index: 2000;
    display: none;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(10px);
}

.lightbox.active {
    display: flex;
}

.lightbox-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    background-color: var(--color-white);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.lightbox-close {
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 2001;
    color: var(--color-white);
    background-color: rgba(0, 0, 0, 0.5);
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

.lightbox-close:hover {
    background-color: rgba(0, 0, 0, 0.8);
    transform: scale(1.1);
}

.lightbox-image-container {
    position: relative;
    background-color: var(--color-black);
}

.lightbox-image {
    width: 100%;
    height: auto;
    max-height: 70vh;
    object-fit: contain;
}

.lightbox-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-white);
    background-color: rgba(0, 0, 0, 0.5);
    border-radius: 50%;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
    opacity: 0;
}

.lightbox-image-container:hover .lightbox-nav {
    opacity: 1;
}

.lightbox-nav:hover {
    background-color: rgba(0, 0, 0, 0.8);
    transform: translateY(-50%) scale(1.1);
}

.lightbox-prev {
    left: var(--spacing-lg);
}

.lightbox-next {
    right: var(--spacing-lg);
}

.lightbox-info {
    padding: var(--spacing-xl);
    background-color: var(--color-white);
}

.lightbox-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--color-black);
    margin-bottom: var(--spacing-sm);
}

.lightbox-description {
    font-size: 1rem;
    color: var(--color-gray-600);
    line-height: 1.7;
}

/* 加载器 */
.loader {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-white);
    z-index: 3000;
    display: none;
    align-items: center;
    justify-content: center;
}

.loader.active {
    display: flex;
}

.loader-content {
    text-align: center;
}

.loader-spinner {
    width: 40px;
    height: 40px;
    border: 2px solid var(--color-gray-300);
    border-top: 2px solid var(--color-black);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto var(--spacing-lg);
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-container {
        padding: 0 var(--spacing-md);
        height: 70px;
    }
    
    .nav-menu {
        gap: var(--spacing-lg);
    }
    
    .main {
        margin-top: 70px;
    }
    
    .hero {
        padding: var(--spacing-2xl) var(--spacing-md);
        min-height: 50vh;
    }
    
    .hero-title {
        font-size: clamp(2.5rem, 10vw, 4rem);
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .filter-section {
        padding: var(--spacing-xl) var(--spacing-md);
    }
    
    .filter-container {
        gap: var(--spacing-md);
    }
    
    .gallery-section {
        padding: var(--spacing-2xl) var(--spacing-md);
    }
    
    .gallery-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .lightbox-content {
        max-width: 95vw;
        max-height: 95vh;
    }
    
    .lightbox-close {
        top: var(--spacing-md);
        right: var(--spacing-md);
        width: 40px;
        height: 40px;
    }
    
    .lightbox-nav {
        width: 48px;
        height: 48px;
    }
    
    .lightbox-info {
        padding: var(--spacing-lg);
    }
    
    .lightbox-title {
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 0 var(--spacing-sm);
        height: 60px;
    }
    
    .nav-menu {
        gap: var(--spacing-sm);
    }
    
    .nav-link {
        font-size: 0.9rem;
    }
    
    .main {
        margin-top: 60px;
    }
    
    .hero {
        padding: var(--spacing-xl) var(--spacing-sm);
    }
    
    .filter-section {
        padding: var(--spacing-lg) var(--spacing-sm);
    }
    
    .gallery-section {
        padding: var(--spacing-xl) var(--spacing-sm);
    }
    
    .gallery-grid {
        gap: var(--spacing-md);
    }
    
    .gallery-item {
        aspect-ratio: 1/1;
    }
}

/* 性能优化和动画 */
.gallery-item {
    will-change: transform;
}

.gallery-item img {
    will-change: transform;
}

/* 特殊效果：视差滚动 */
@media (min-width: 1024px) {
    .hero {
        background-attachment: fixed;
        background-size: cover;
        background-position: center;
    }
}

/* 可访问性增强 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 高对比度支持 */
@media (prefers-contrast: high) {
    .nav {
        border-bottom: 2px solid var(--color-black);
    }
    
    .filter-btn.active::after {
        height: 3px;
    }
}

/* 暗色模式支持 */
@media (prefers-color-scheme: dark) {
    :root {
        --color-white: #000000;
        --color-black: #ffffff;
        --color-gray-100: #212529;
        --color-gray-200: #343a40;
        --color-gray-300: #495057;
        --color-gray-400: #6c757d;
        --color-gray-500: #adb5bd;
        --color-gray-600: #ced4da;
        --color-gray-700: #dee2e6;
        --color-gray-800: #e9ecef;
        --color-gray-900: #f8f9fa;
    }
    
    .nav {
        background-color: rgba(0, 0, 0, 0.95);
        border-bottom-color: var(--color-gray-800);
    }
    
    .loader {
        background-color: var(--color-black);
    }
}