/* --- 基础设置 (Reset & Base) --- */
:root {
    --text-main: #333333;
    --text-light: #888888;
    --bg-color: #fafafa; /* 极浅的灰白，比纯白更柔和 */
    --accent-gold: #C5A059;
    --font-jp-serif: 'Shippori Mincho', serif; /* 日文宋体 */
    --font-en-serif: 'Cormorant Garamond', serif; /* 英文衬线 */
    --font-sans: 'Zen Kaku Gothic New', sans-serif; /* 日文黑体 */
}

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

html { scroll-behavior: smooth; }

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: var(--font-sans);
    line-height: 1.8;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

a { text-decoration: none; color: inherit; transition: opacity 0.3s; }
a:hover { opacity: 0.6; }

ul { list-style: none; }

/* --- 动画工具 --- */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeInUp 1.2s ease-out forwards;
}

/* --- 导航栏 (Header) --- */
header {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 2rem 4rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    mix-blend-mode: difference; /* 让文字在深色背景上也可见 */
    color: #fff;
}

.logo {
    font-family: var(--font-en-serif);
    font-size: 1.8rem;
    letter-spacing: 0.1em;
    font-weight: 500;
}

nav ul {
    display: flex;
    gap: 3rem;
}

nav li a {
    font-family: var(--font-en-serif);
    font-size: 1.1rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* --- 首屏 (Hero Section) --- */
.hero {
    height: 100vh;
    width: 100%;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    /* 【已更新】Hero背景图：抽象的艺术流体，体现融合感 */
    background: url('../images/hero/hero-bg.jpg') no-repeat center center/cover;
    filter: brightness(0.8) contrast(1.1);
    z-index: -1;
}

.hero-content {
    text-align: center;
    color: #fff;
    padding: 0 20px;
    /* 增加文字阴影以确保在复杂背景上的可读性 */
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.hero-title {
    font-family: var(--font-en-serif);
    font-size: 5vw; /* 响应式字体大小 */
    font-weight: 300;
    margin-bottom: 1rem;
    line-height: 1.1;
}

.hero-subtitle {
    font-family: var(--font-jp-serif);
    font-size: 1.2rem;
    letter-spacing: 0.2em;
    margin-top: 1rem;
    font-weight: 400;
}

/* --- 通用版块设置 --- */
section {
    padding: 8rem 10%; /* 大留白 */
}

.section-title {
    font-family: var(--font-en-serif);
    font-size: 3rem;
    text-align: center;
    margin-bottom: 6rem;
    color: var(--text-main);
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 1px;
    height: 60px;
    background: #ccc;
    margin: 20px auto 0;
}

/* --- 业务介绍 (Business - Magazine Layout) --- */
.business-item {
    display: flex;
    align-items: center;
    margin-bottom: 12rem; /* 增加间距 */
    position: relative;
}

.business-item:nth-child(even) {
    flex-direction: row-reverse; /* 偶数行图片在右，文字在左 */
}

.biz-img {
    flex: 1.3;
    height: 550px;
    overflow: hidden;
    box-shadow: 20px 20px 60px rgba(0,0,0,0.08); /* 轻柔阴影 */
}

.biz-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 1.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.biz-img:hover img {
    transform: scale(1.05); /* 悬停缓慢放大 */
}

.biz-text {
    flex: 1;
    padding: 4rem 5rem;
    background: #fff; /* 纯白背景强调 */
    z-index: 10;
    /* 制造错位叠加效果 */
    margin-left: -80px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.05);
}

.business-item:nth-child(even) .biz-text {
    margin-left: 0;
    margin-right: -80px;
}

.biz-cat {
    font-family: var(--font-en-serif);
    color: var(--accent-gold);
    font-size: 1rem;
    letter-spacing: 0.2em;
    margin-bottom: 1.5rem;
    display: block;
    font-weight: 500;
}

.biz-name {
    font-family: var(--font-jp-serif);
    font-size: 2.2rem;
    margin-bottom: 2rem;
    font-weight: 500;
    line-height: 1.4;
}

.biz-desc {
    color: var(--text-light);
    font-size: 1rem;
    line-height: 2.2;
}

/* --- 公司概况 (Company Info) --- */
.company-wrapper {
    max-width: 800px;
    margin: 0 auto;
    border-top: 1px solid #eee;
}

.info-row {
    display: flex;
    padding: 2rem 0;
    border-bottom: 1px solid #eee;
    align-items: baseline;
}

.info-label {
    width: 30%;
    font-family: var(--font-jp-serif);
    font-weight: 600;
    color: var(--text-main);
}

.info-value {
    width: 70%;
    color: var(--text-light);
    font-family: var(--font-sans);
}

/* --- 页脚 (Footer) --- */
footer {
    text-align: center;
    padding: 4rem 0;
    background: #f5f5f5;
    font-family: var(--font-en-serif);
    font-size: 0.9rem;
    color: var(--text-light);
    letter-spacing: 0.05em;
}

/* --- 移动端适配 (Responsive) --- */
@media (max-width: 768px) {
    header { padding: 1.5rem; justify-content: center; }
    .desktop-only { display: none; } /* 移动端暂藏导航 */

    .hero-title { font-size: 3.5rem; }
    section { padding: 6rem 5%; }

    .business-item, .business-item:nth-child(even) {
        flex-direction: column;
        margin-bottom: 8rem;
    }
    .biz-img { width: 100%; height: 350px; }
    .biz-text, .business-item:nth-child(even) .biz-text {
        margin: -60px 20px 0 20px; /* 移动端上移叠加 */
        padding: 3rem 2rem;
        width: auto;
    }
    .info-row { flex-direction: column; gap: 0.8rem; }
    .info-label { width: 100%; font-size: 1.1rem; }
}