/* ==================== CSS变量 ==================== */
:root {
    /* 主题色 */
    --primary: #1a1a2e;
    --secondary: #16213e;
    --accent: #e94560;
    --gold: #d4af37;
    
    /* 文字颜色 */
    --text: #333;
    --text-light: #666;
    --white: #fff;
    
    /* 背景色 */
    --gray-100: #f8f9fa;
    --gray-200: #e9ecef;
    
    /* 过渡动画 */
    --transition: 0.3s;
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    
    /* 阴影 */
    --shadow-sm: 0 10px 40px rgba(0,0,0,0.08);
    --shadow-md: 0 20px 50px rgba(0,0,0,0.1);
    --shadow-lg: 0 30px 60px rgba(0,0,0,0.15);
}

/* ==================== 通用样式重置 ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text);
    line-height: 1.8;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

/* ==================== 导航栏 ==================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(26, 26, 46, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    padding: 0 5%;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.logo-icon {
    width: 45px;
    height: 45px;
    border-radius: 10px;
    object-fit: contain;
}

.logo-text {
    color: var(--white);
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    gap: 40px;
    list-style: none;
}

.nav-links a {
    color: var(--white);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    padding: 8px 0;
    position: relative;
    transition: var(--transition);
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gold);
    transition: var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

/* ==================== 移动端导航 ==================== */
.mobile-menu {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 18px;
    gap: 6px;
    cursor: pointer;
    transform: rotate(0deg);
}

.mobile-menu span {
    display: block;
    width: 28px;
    height: 2px;
    background: #333333;
    transition: var(--transition);
    border-radius: 0px;
}

.mobile-nav {
    display: none;
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    background: var(--primary);
    padding: 20px 5%;
    flex-direction: column;
    gap: 15px;
}

.mobile-nav.show {
    display: flex !important;
}

.mobile-nav a {
    color: var(--white);
    font-size: 16px;
    padding: 10px 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

/* ==================== 页脚 ==================== */
.footer {
    background: var(--primary);
    padding: 60px 5% 30px;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand h3 {
    color: var(--white);
    font-size: 24px;
    margin-bottom: 20px;
}

.footer-brand p {
    color: rgba(255,255,255,0.6);
    font-size: 15px;
    line-height: 1.8;
}

.footer-links h4 {
    color: var(--white);
    font-size: 16px;
    margin-bottom: 24px;
    font-weight: 600;
}

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

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

.footer-links a {
    color: rgba(255,255,255,0.6);
    text-decoration: none;
    font-size: 15px;
    transition: var(--transition);
}

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

.footer-bottom {
    max-width: 1400px;
    margin: 30px auto 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-bottom p {
    color: rgba(255,255,255,0.4);
    font-size: 14px;
}

/* ==================== 按钮样式 ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 10px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), #ff6b6b);
    color: var(--white);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(233,69,96,0.3);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--white);
    color: var(--white);
}

.btn-outline:hover {
    background: var(--white);
    color: var(--primary);
}

/* ==================== 响应式断点 ==================== */
@media (max-width: 992px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu {
        display: flex;
    }
    
    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

/* ==================== 动画 ==================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out forwards;
}