/* 纯静态网站款式：淡黑金风格 (Pale Black Gold) */
:root {
    --primary-gold: #d4af37;
    --pale-gold: #f1d592;
    --accent-gold: #c5a028;
    --dark-bg: #121212;
    --darker-bg: #0a0a0a;
    --card-bg: #1e1e1e;
    --text-main: #f5f5f5;
    --text-dim: #b0b0b0;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "PingFang SC", "Microsoft YaHei", sans-serif;
}

body {
    background-color: var(--dark-bg);
    color: var(--text-main);
    overflow-x: hidden;
    line-height: 1.6;
}

/* 滚动条 */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--darker-bg);
}
::-webkit-scrollbar-thumb {
    background: var(--primary-gold);
    border-radius: 4px;
}

/* 导航栏 */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.95);
    border-bottom: 1px solid rgba(212, 175, 55, 0.2);
    backdrop-filter: blur(10px);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-gold);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-main);
    font-weight: 500;
    transition: var(--transition);
    font-size: 0.95rem;
}

.nav-links a:hover {
    color: var(--primary-gold);
}

/* 英雄区 */
.hero {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), 
                url('https://tse-mm.bing.com/th?q=企业总部大楼') no-repeat center center/cover;
    text-align: center;
    padding: 0 5%;
}

.hero h1 {
    font-size: 3.5rem;
    color: var(--pale-gold);
    margin-bottom: 1rem;
    text-shadow: 0 4px 10px rgba(0,0,0,0.5);
    animation: fadeInUp 1s ease;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-dim);
    max-width: 800px;
    animation: fadeInUp 1.2s ease;
}

/* 通用容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 5rem 5%;
}

.section-title {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title h2 {
    font-size: 2.5rem;
    color: var(--primary-gold);
    position: relative;
    display: inline-block;
    padding-bottom: 10px;
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: var(--accent-gold);
}

/* 网格布局 */
.grid {
    display: grid;
    gap: 2rem;
}

.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* 卡片 */
.card {
    background: var(--card-bg);
    border: 1px solid rgba(212, 175, 55, 0.1);
    border-radius: 8px;
    padding: 2rem;
    transition: var(--transition);
    overflow: hidden;
}

.card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-gold);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 4px;
    margin-bottom: 1.5rem;
    cursor: pointer;
}

/* 列表样式 */
.list-item {
    padding: 1rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

.list-item:last-child { border: none; }

/* 按钮 */
.btn {
    display: inline-block;
    padding: 10px 25px;
    background: transparent;
    border: 1px solid var(--primary-gold);
    color: var(--primary-gold);
    text-decoration: none;
    border-radius: 4px;
    transition: var(--transition);
    cursor: pointer;
}

.btn:hover {
    background: var(--primary-gold);
    color: #000;
}

.btn-filled {
    background: var(--primary-gold);
    color: #000;
}

.btn-filled:hover {
    background: var(--pale-gold);
}

/* 页脚 */
footer {
    background: var(--darker-bg);
    padding: 4rem 5% 2rem;
    border-top: 1px solid rgba(212, 175, 55, 0.1);
}

/* 响应式 */
@media (max-width: 992px) {
    .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .hero h1 { font-size: 2.5rem; }
}

@media (max-width: 600px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .nav-links { display: none; }
}

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

/* 过滤与排序区域 */
.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-bottom: 3rem;
    background: rgba(255,255,255,0.02);
    padding: 1.5rem;
    border-radius: 8px;
}

.filter-group select, .filter-group input {
    background: #2a2a2a;
    border: 1px solid rgba(212, 175, 55, 0.3);
    color: #fff;
    padding: 8px 15px;
    border-radius: 4px;
    outline: none;
}

.filter-group select:focus { border-color: var(--primary-gold); }

/* 在线客服按钮 */
.online-service {
    position: fixed;
    right: 30px;
    bottom: 30px;
    z-index: 999;
}

.service-float {
    width: 60px;
    height: 60px;
    background: var(--primary-gold);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
    cursor: pointer;
    transition: var(--transition);
}

.service-float:hover { transform: scale(1.1); }