/* 
 * 全局样式定义 - 纯粹时尚美学
 * 遵循极简主义设计原则
 */

:root {
    /* 核心色调 */
    --color-bg: #F5F5F3; /* 米白/浅灰背景 */
    --color-surface: #FFFFFF;
    --color-text-primary: #2C2C2C; /* 深灰主文字 */
    --color-text-secondary: #666666; /* 次要文字 */
    --color-accent: #C5B358; /* 少量金属色点缀 */
    --color-border: #E0E0E0;
    
    /* 间距系统 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 8rem;

    /* 字体栈 */
    --font-primary: "Helvetica Neue", "PingFang SC", "Source Han Sans CN", "Microsoft YaHei", sans-serif;
    
    /* 动画 */
    --transition-smooth: all 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-hover: transform 0.6s cubic-bezier(0.215, 0.610, 0.355, 1.000), box-shadow 0.6s ease;
}

/* =========================================
   基础重置 (Reset & Base)
   ========================================= */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s ease;
}

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

ul {
    list-style: none;
}

/* =========================================
   排版 (Typography)
   ========================================= */
h1, h2, h3, h4 {
    font-weight: 400;
    line-height: 1.2;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.5rem; }
p { margin-bottom: 1.5rem; color: var(--color-text-secondary); }

/* 工具类：辅助文本样式 */
.text-center { text-align: center; }
.text-uppercase { text-transform: uppercase; letter-spacing: 0.2em; }
.text-light { color: var(--color-surface); }
.font-serif { font-family: "Times New Roman", serif; font-style: italic; }

/* =========================================
   布局容器 (Layout)
   ========================================= */
.container {
    width: 90%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-sm);
}

.section-padding {
    padding: var(--spacing-xl) 0;
}

/* 导航栏 */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: var(--transition-smooth);
}

.site-header.scrolled {
    border-bottom-color: var(--color-border);
    padding: var(--spacing-xs) 0;
}

.nav-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 80px;
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    position: relative;
    padding-bottom: 5px;
}

/* 导航当前状态及悬停线条动画 */
.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 1px;
    background-color: var(--color-text-primary);
    transition: width 0.3s ease, left 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
    left: 0;
}

/* =========================================
   组件：首页全屏轮播 (Hero Slider)
   ========================================= */
.hero-slider {
    position: relative;
    height: 100vh;
    width: 100%;
    overflow: hidden;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 1.5s ease-in-out;
    z-index: 1;
}

.slide.active {
    opacity: 1;
    z-index: 2;
}

.slide-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center 20%; /* 略微调整焦点 */
    animation: zoomEffect 20s infinite alternate;
}

@keyframes zoomEffect {
    0% { transform: scale(1); }
    100% { transform: scale(1.1); }
}

.slide-content {
    position: absolute;
    bottom: 15%;
    left: 10%;
    z-index: 3;
    color: var(--color-surface);
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.slide-title {
    font-size: 4rem;
    font-weight: 300;
    margin-bottom: var(--spacing-xs);
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.8s ease 0.5s; /* 延迟显示 */
}

.slide.active .slide-title {
    opacity: 1;
    transform: translateY(0);
}

/* 轮播指示器 */
.slider-indicators {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 15px;
    z-index: 10;
}

.indicator {
    width: 40px;
    height: 2px;
    background-color: rgba(255,255,255,0.4);
    cursor: pointer;
    transition: background-color 0.3s;
}

.indicator.active {
    background-color: #fff;
}

/* =========================================
   组件：视觉板块 (首页)
   ========================================= */
.visual-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-md);
    margin-top: -100px; /* 上移与Banner重叠一点 */
    position: relative;
    z-index: 10;
    padding-bottom: var(--spacing-xl);
}

.visual-card {
    background: var(--color-surface);
    padding: var(--spacing-sm);
    box-shadow: 0 10px 30px rgba(0,0,0,0.03);
    transition: var(--transition-smooth);
    overflow: hidden;
}

.visual-card:hover {
    transform: translateY(-10px);
}

.card-image-wrapper {
    overflow: hidden;
    aspect-ratio: 3/4;
    margin-bottom: var(--spacing-sm);
}

.card-image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-hover);
}

.visual-card:hover .card-image-wrapper img {
    transform: scale(1.05);
}

.card-title {
    font-size: 1.1rem;
    letter-spacing: 0.1em;
    text-align: center;
    margin: 0;
    color: var(--color-text-primary);
}

/* =========================================
   页面：设计哲学 (Split Layout)
   ========================================= */
.philosophy-layout {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-xl);
    min-height: 100vh;
}

.sticky-content {
    position: sticky;
    top: 20vh;
    height: fit-content;
    padding-right: var(--spacing-md);
    border-right: 1px solid var(--color-border);
}

.scroll-content {
    padding-bottom: var(--spacing-xl);
}

.philosophy-section {
    margin-bottom: var(--spacing-xl);
    opacity: 0.5;
    transition: opacity 0.5s ease;
}

.philosophy-section.in-view {
    opacity: 1;
}

.philosophy-text {
    margin-bottom: var(--spacing-md);
    max-width: 600px;
}

.philosophy-img {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
    margin-bottom: var(--spacing-sm);
}

/* =========================================
   页面：永恒之作 (Masonry/Grid)
   ========================================= */
.filter-nav {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin: var(--spacing-lg) 0;
    flex-wrap: wrap;
}

.filter-btn {
    background: none;
    border: none;
    font-family: inherit;
    font-size: 1rem;
    cursor: pointer;
    padding-bottom: 5px;
    color: var(--color-text-secondary);
    transition: color 0.3s;
}

.filter-btn:hover, .filter-btn.active {
    color: var(--color-text-primary);
    border-bottom: 1px solid var(--color-text-primary);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 40px; /* 更大的间距展示呼吸感 */
}

.product-item {
    position: relative;
    cursor: pointer;
}

.product-image-container {
    position: relative;
    overflow: hidden;
    aspect-ratio: 4/5;
    background-color: #f0f0f0;
}

.product-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-hover);
}

/* 悬停显示第二张图逻辑可通过JS或CSS opacity实现，这里用放大 */
.product-item:hover .product-img {
    transform: scale(1.08);
}

.product-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: var(--spacing-sm);
    background: linear-gradient(to top, rgba(0,0,0,0.4), transparent);
    opacity: 0;
    transition: opacity 0.3s ease;
    color: #fff;
}

.product-item:hover .product-overlay {
    opacity: 1;
}

/* =========================================
   页脚
   ========================================= */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-md) 0;
    margin-top: var(--spacing-xl);
    text-align: center;
    background-color: var(--color-surface);
}

.copyright {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    letter-spacing: 0.1em;
}

/* =========================================
   响应式适配 (Responsive)
   ========================================= */
@media (max-width: 1024px) {
    .visual-grid {
        grid-template-columns: repeat(2, 1fr);
        margin-top: 0;
    }
    
    h1 { font-size: 2.5rem; }
}

@media (max-width: 768px) {
    /* 导航栏变为汉堡菜单或简化布局（此处简化为垂直堆叠） */
    .nav-wrapper {
        height: auto;
        padding: 1rem 0;
    }
    
    .nav-links {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    /* 首页 */
    .slide-title { font-size: 2rem; }
    
    .visual-grid {
        grid-template-columns: 1fr;
        padding: 0 var(--spacing-sm);
    }
    
    .visual-card { margin-bottom: var(--spacing-sm); }

    /* 设计哲学 */
    .philosophy-layout {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .sticky-content {
        position: static;
        border-right: none;
        border-bottom: 1px solid var(--color-border);
        margin-bottom: var(--spacing-md);
        padding-bottom: var(--spacing-md);
    }

    /* 永恒之作 */
    .gallery-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
}