/* 
 * 全局样式文件 - 极简现代风格
 * 遵循设计令牌：颜色、间距、排版
 */

:root {
    /* 颜色系统 */
    --color-bg: #ffffff;
    --color-text-primary: #1a1a1a;
    --color-text-secondary: #666666;
    --color-accent-gold: #d4af37;
    --color-accent-silver: #c0c0c0;
    
    /* 辅助色 - 低饱和度 */
    --color-clay: #cfa692;
    --color-blue-grey: #7fa3b0;
    --color-oat: #f0e6d2;
    --color-bg-light: #f9f9f9;

    /* 字体系统 */
    --font-primary: 'Helvetica Neue', 'Helvetica', 'Arial', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    --font-heading: 'Helvetica Neue', sans-serif;

    /* 间距系统 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;
    
    /* 布局 */
    --container-width: 1440px;
    --header-height: 80px;
}

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* 核心布局组件 */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    width: 100%;
}

/* 导航栏 */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex;
    align-items: center;
    border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: transform 0.3s ease;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 2px;
    text-decoration: none;
    color: var(--color-text-primary);
    text-transform: uppercase;
}

.main-nav {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    text-decoration: none;
    color: var(--color-text-primary);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    padding: 5px 0;
    transition: color 0.3s ease;
}

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 1px;
    bottom: 0;
    left: 0;
    background-color: var(--color-text-primary);
    transition: width 0.3s ease;
}

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

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--color-text-primary);
}

/* 页脚 */
.site-footer {
    padding: var(--spacing-lg) 0;
    text-align: center;
    border-top: 1px solid rgba(0,0,0,0.05);
    margin-top: var(--spacing-xl);
}

.footer-text {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    letter-spacing: 2px;
}

/* 通用排版 */
h1, h2, h3, h4, h5, h6 {
    font-weight: 400;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.5px;
    position: relative;
    padding-bottom: var(--spacing-sm);
}

.section-title::after {
    content: '';
    display: block;
    width: 40px;
    height: 2px;
    background: var(--color-text-primary);
    margin: var(--spacing-sm) auto 0;
}

.text-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    color: var(--color-text-secondary);
}

/* 视觉组件：全屏轮播/Hero */
.hero-section {
    height: 100vh;
    width: 100%;
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1.5s ease-in-out;
}

.hero-slide.active {
    opacity: 1;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.1); /* 轻微遮罩 */
}

/* 网格布局系统 */
.grid-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
}

.grid-item {
    position: relative;
    overflow: hidden;
    aspect-ratio: 3/4;
    cursor: pointer;
}

.grid-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.grid-item:hover .grid-image {
    transform: scale(1.05);
}

/* 文字与图片组合 */
.split-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
    margin: var(--spacing-xl) 0;
}

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

.split-image-container {
    width: 100%;
    height: 80vh;
    overflow: hidden;
}

.split-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 详情卡片 */
.detail-card {
    background: var(--color-bg-light);
    padding: var(--spacing-md);
    text-align: center;
    transition: transform 0.3s ease;
}

.detail-card h3 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.detail-card p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}

/* 按钮样式 */
.btn-primary {
    display: inline-block;
    padding: 12px 30px;
    background: var(--color-text-primary);
    color: var(--color-bg);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.8rem;
    transition: background 0.3s ease;
    border: 1px solid var(--color-text-primary);
}

.btn-primary:hover {
    background: transparent;
    color: var(--color-text-primary);
}

.btn-outline {
    display: inline-block;
    padding: 12px 30px;
    border: 1px solid var(--color-text-primary);
    color: var(--color-text-primary);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.8rem;
    transition: all 0.3s ease;
}

.btn-outline:hover {
    background: var(--color-text-primary);
    color: var(--color-bg);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 5rem;
    }
    .split-section {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    .split-image-container {
        height: 50vh;
    }
}

@media (max-width: 768px) {
    .site-header {
        height: 60px;
    }
    .mobile-menu-btn {
        display: block;
    }
    .main-nav {
        display: none; /* 后续可用JS控制显示 */
        position: fixed;
        top: 60px;
        left: 0;
        width: 100%;
        height: calc(100vh - 60px);
        background: var(--color-bg);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: var(--spacing-md);
    }
    .main-nav.active {
        display: flex;
    }
    .grid-gallery {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
    .section-title {
        font-size: 1.8rem;
    }
}

/* 实用工具类 */
.mt-lg { margin-top: var(--spacing-lg); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.text-center { text-align: center; }
.uppercase { text-transform: uppercase; }
.bg-light { background-color: var(--color-bg-light); }
.fade-in {
    animation: fadeIn 1s ease-out forwards;
    opacity: 0;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 动态槽位预留 */
.dynamic-slot {
    min-height: 50px;
    display: none; /* 默认隐藏，有内容时由JS激活或自行填充 */
}