/* 字体导入 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;700&family=Playfair+Display:wght@700&display=swap');

/* 设计令牌 */
:root {
    --color-primary: #000;
    --color-secondary: #fff;
    --color-accent: #BF9780;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Noto Sans SC', sans-serif;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --border-radius-sm: 0.25rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 0.75rem;
    --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);
}

/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-body);
    color: var(--color-gray-900);
    background-color: var(--color-secondary);
    line-height: 1.6;
}

/* 导航栏样式 */
.nav-container {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

.nav-link {
    position: relative;
    color: var(--color-gray-700);
    text-decoration: none;
    font-weight: 400;
    transition: color 0.3s ease;
    padding-bottom: var(--spacing-xs);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: width 0.3s ease;
}

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

.nav-link:hover::after {
    width: 100%;
}

.nav-link.active {
    color: var(--color-primary);
    font-weight: 700;
}

.nav-link.active::after {
    width: 100%;
    background-color: var(--color-primary);
}

/* 移动端菜单按钮 */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
}

.nav-toggle span {
    width: 100%;
    height: 2px;
    background-color: var(--color-gray-700);
    transition: all 0.3s ease;
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* 主内容区域 */
main {
    margin-top: 80px;
    min-height: calc(100vh - 160px);
}

/* 容器样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* 页面标题 */
.page-title {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 700;
    text-align: center;
    margin: var(--spacing-2xl) 0;
    color: var(--color-primary);
}

/* 图片网格 */
.image-grid {
    display: grid;
    gap: var(--spacing-md);
    margin: var(--spacing-2xl) 0;
}

/* 瀑布流布局 */
.masonry-grid {
    column-count: 3;
    column-gap: var(--spacing-md);
}

.masonry-item {
    break-inside: avoid;
    margin-bottom: var(--spacing-md);
}

.masonry-item img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.3s ease, filter 0.3s ease;
}

.masonry-item img:hover {
    transform: scale(1.02);
    filter: brightness(0.95);
}

/* 系列页面特写图 */
.collection-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.collection-item {
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.collection-item:hover {
    box-shadow: var(--shadow-lg);
}

.collection-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

/* 故事页面样式 */
.story-section {
    display: flex;
    align-items: center;
    min-height: 80vh;
    gap: var(--spacing-2xl);
}

.story-content {
    flex: 1;
    padding: var(--spacing-2xl);
}

.story-image {
    flex: 1;
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius-lg);
}

.story-image img {
    width: 100%;
    height: auto;
    display: block;
}

/* 视觉页面样式 */
.visual-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--spacing-xl);
}

.visual-item {
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius-lg);
    aspect-ratio: 16/9;
}

.visual-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.visual-item:hover img {
    transform: scale(1.1);
}

/* 灯箱样式 */
.lightbox {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    z-index: 2000;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lightbox.active {
    display: flex;
    opacity: 1;
}

.lightbox-content {
    max-width: 90%;
    max-height: 90%;
    position: relative;
}

.lightbox img {
    width: 100%;
    height: auto;
    display: block;
}

.lightbox-close {
    position: absolute;
    top: -40px;
    right: 0;
    color: var(--color-secondary);
    font-size: 2rem;
    cursor: pointer;
    background: transparent;
    border: none;
    padding: 0;
    line-height: 1;
}

/* 页脚样式 */
footer {
    background-color: var(--color-gray-100);
    padding: var(--spacing-lg) 0;
    text-align: center;
    margin-top: var(--spacing-2xl);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: var(--color-secondary);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding-top: var(--spacing-2xl);
        transition: left 0.3s ease;
        box-shadow: var(--shadow-lg);
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .masonry-grid {
        column-count: 2;
    }

    .collection-grid {
        grid-template-columns: 1fr;
    }

    .visual-grid {
        grid-template-columns: 1fr;
    }

    .story-section {
        flex-direction: column;
    }

    .page-title {
        font-size: 2rem;
    }

    .nav-content {
        padding: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .masonry-grid {
        column-count: 1;
    }

    .container {
        padding: 0 var(--spacing-sm);
    }
}

/* 动画类 */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--color-gray-400);
    border-radius: var(--border-radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-gray-500);
}