/* 全局变量定义 - 淡黑金风格 */
:root {
    --primary-bg: #121212;
    --secondary-bg: #1a1a1a;
    --gold-main: #c5a059;
    --gold-light: #e5c185;
    --text-white: #ffffff;
    --text-gray: #b0b0b0;
    --accent-gold: rgba(197, 160, 89, 0.2);
    --transition-slow: 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}

html {
    scroll-behavior: smooth;
}

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

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

section {
    padding: 100px 0;
}

/* 导航栏 */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(18, 18, 18, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(197, 160, 89, 0.1);
    padding: 20px 0;
}

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

.logo {
    font-size: 24px;
    font-weight: 800;
    letter-spacing: 2px;
    color: var(--gold-main);
    text-decoration: none;
}

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

.nav-links a {
    text-decoration: none;
    color: var(--text-white);
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    transition: 0.3s;
    letter-spacing: 1px;
}

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

/* 标题样式 */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 42px;
    color: var(--gold-main);
    margin-bottom: 15px;
    font-weight: 700;
}

.section-header p {
    color: var(--text-gray);
    letter-spacing: 2px;
}

/* 按钮 */
.btn-gold {
    display: inline-block;
    padding: 15px 35px;
    background: var(--gold-main);
    color: var(--primary-bg);
    text-decoration: none;
    font-weight: 700;
    border-radius: 4px;
    transition: 0.4s;
    border: none;
    cursor: pointer;
}

.btn-gold:hover {
    background: var(--gold-light);
    transform: translateY(-3px);
    box-shadow: 0 10px 20px rgba(197, 160, 89, 0.3);
}

/* 页脚 */
footer {
    background: #0a0a0a;
    padding: 80px 0 20px;
    border-top: 1px solid rgba(197, 160, 89, 0.1);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 60px;
}

.footer-col h4 {
    color: var(--gold-main);
    margin-bottom: 25px;
    font-size: 18px;
}

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

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

.footer-col ul li a {
    color: var(--text-gray);
    text-decoration: none;
    transition: 0.3s;
}

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

.footer-bottom {
    text-align: center;
    border-top: 1px solid rgba(255,255,255,0.05);
    padding-top: 30px;
    color: var(--text-gray);
    font-size: 13px;
}

/* 动画类 */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition-slow);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* 响应式适配 */
@media (max-width: 992px) {
    .container { padding: 0 25px; }
    .nav-links { display: none; } /* 应实现汉堡菜单 */
    .section-header h2 { font-size: 32px; }
}