/* 
    KY开元(集团)有限公司 - 全局样式表
    风格：淡黑金 (Muted Black Gold)
*/

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600&family=Playfair+Display:ital,wght@0,700;1,700&display=swap');

:root {
    --bg-dark: #0a0a0a;
    --bg-secondary: #121212;
    --gold: #c5a029;
    --gold-muted: #8b732e;
    --text-main: #e0e0e0;
    --text-muted: #999999;
    --border: rgba(139, 115, 46, 0.2);
    --transition: all 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
    scroll-behavior: smooth;
    background-color: var(--bg-dark);
}

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
    background-color: var(--bg-dark);
}

h1, h2, h3, .serif {
    font-family: 'Playfair Display', serif;
}

/* 布局组件 */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
}

section {
    padding: 100px 0;
    position: relative;
}

/* 导航栏 */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 30px 0;
    background: linear-gradient(to bottom, rgba(10,10,10,0.95), transparent);
    transition: var(--transition);
}

nav.scrolled {
    padding: 15px 0;
    background: rgba(10, 10, 10, 0.98);
    border-bottom: 1px solid var(--border);
}

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

.logo {
    font-family: 'Playfair Display', serif;
    font-weight: 700;
    font-size: 24px;
    color: var(--gold);
    text-decoration: none;
    letter-spacing: 2px;
}

.nav-links {
    display: flex;
    gap: 40px;
}

.nav-links a {
    color: var(--text-main);
    text-decoration: none;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 500;
    transition: var(--transition);
}

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

/* 按钮 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border: 1px solid var(--gold);
    color: var(--gold);
    text-decoration: none;
    text-transform: uppercase;
    font-size: 12px;
    letter-spacing: 2px;
    transition: var(--transition);
    background: transparent;
    cursor: pointer;
}

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

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

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

/* 页头 */
.hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: linear-gradient(rgba(10,10,10,0.7), rgba(10,10,10,0.7)), url('https://tse-mm.bing.com/th?q=奢侈品质感建筑') center/cover no-repeat;
    background-attachment: fixed;
}

.hero-content h1 {
    font-size: 80px;
    margin-bottom: 20px;
    line-height: 1.1;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s forwards 0.5s;
}

.hero-content p {
    font-size: 18px;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 40px;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 1s forwards 0.8s;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 滚动提示 */
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {transform: translateY(0) translateX(-50%);}
    40% {transform: translateY(-10px) translateX(-50%);}
    60% {transform: translateY(-5px) translateX(-50%);}
}

/* 模块标题 */
.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-header span {
    display: block;
    color: var(--gold);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 4px;
    margin-bottom: 15px;
}

.section-header h2 {
    font-size: 48px;
    color: var(--text-main);
}

/* 卡片 */
.card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    transition: var(--transition);
    overflow: hidden;
}

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

/* 页脚 */
footer {
    background: #050505;
    padding: 80px 0 40px;
    border-top: 1px solid var(--border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-logo {
    font-size: 24px;
    color: var(--gold);
    margin-bottom: 20px;
}

.footer-col h4 {
    color: var(--gold);
    margin-bottom: 25px;
    font-size: 16px;
    text-transform: uppercase;
}

.footer-col ul {
    list-style: none;
}

.footer-col ul li {
    margin-bottom: 12px;
}

.footer-col ul li a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
}

.footer-col ul li a:hover {
    color: var(--gold);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    padding-top: 40px;
    border-top: 1px solid rgba(255,255,255,0.05);
    font-size: 13px;
    color: var(--text-muted);
}

/* 响应式 */
@media (max-width: 992px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
    .hero-content h1 {
        font-size: 50px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

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

.service-btn {
    width: 60px;
    height: 60px;
    background: var(--gold);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    cursor: pointer;
    transition: var(--transition);
}

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