/* 
   KY开元集团 - 全局样式表
   风格：淡黑金 (Pale Black & Gold)
*/
:root {
    --gold: #d4af37;
    --gold-light: #f1e5ac;
    --bg-dark: #121212;
    --bg-card: #1e1e1e;
    --text-main: #e0e0e0;
    --text-muted: #a0a0a0;
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

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

/* Header & Nav */
header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(18, 18, 18, 0.95);
    border-bottom: 1px solid var(--gold);
    z-index: 1000;
    backdrop-filter: blur(10px);
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--gold);
    text-decoration: none;
    letter-spacing: 2px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-main);
    text-decoration: none;
    font-size: 0.95rem;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 1px;
}

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

/* Hero Section */
.hero {
    height: 80vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), url('https://tse-mm.bing.com/th?q=Corporate+Background+Black+Gold');
    background-size: cover;
    background-position: center;
    padding: 0 1rem;
}

.hero h1 {
    font-size: 3.5rem;
    color: var(--gold);
    margin-bottom: 1rem;
    text-shadow: 0 0 20px rgba(212, 175, 55, 0.3);
}

.hero p {
    font-size: 1.2rem;
    max-width: 800px;
}

/* Sections */
section {
    padding: 5rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    color: var(--gold);
    margin-bottom: 3rem;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 60px;
    height: 3px;
    background: var(--gold);
    margin: 1rem auto;
}

/* Grid Layouts */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.card {
    background: var(--bg-card);
    border: 1px solid #333;
    padding: 2rem;
    border-radius: 8px;
    transition: var(--transition);
}

.card:hover {
    transform: translateY(-10px);
    border-color: var(--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;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    background: transparent;
    color: var(--gold);
    border: 1px solid var(--gold);
    text-decoration: none;
    border-radius: 4px;
    transition: var(--transition);
    cursor: pointer;
}

.btn:hover {
    background: var(--gold);
    color: var(--bg-dark);
}

/* News List */
.news-list {
    list-style: none;
}

.news-item {
    padding: 1.5rem;
    border-bottom: 1px solid #333;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.news-item h3 {
    font-size: 1.1rem;
    color: var(--text-main);
}

.news-date {
    color: var(--gold);
    font-size: 0.9rem;
}

/* Footer */
footer {
    background: #0a0a0a;
    padding: 4rem 2rem;
    border-top: 1px solid #333;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
}

.footer-info h4 {
    color: var(--gold);
    margin-bottom: 1.5rem;
}

.footer-info p, .footer-info a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    display: block;
}

/* Floating Elements */
.online-service {
    position: fixed;
    right: 20px;
    bottom: 40px;
    background: var(--gold);
    color: var(--bg-dark);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 0 4px 15px rgba(212, 175, 55, 0.4);
    cursor: pointer;
    z-index: 999;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .hero h1 { font-size: 2.2rem; }
}