/* 全局CSS变量 */
        :root {
            --primary-color: #ff6b35;
            --secondary-color: #f7931e;
            --dark-bg: #0a0a0a;
            --dark-secondary: #1a1a2e;
            --dark-tertiary: #16213e;
            --glass-bg: rgba(255, 255, 255, 0.05);
            --glass-border: rgba(255, 255, 255, 0.1);
            --text-primary: #ffffff;
            --text-secondary: rgba(255, 255, 255, 0.8);
            --text-muted: rgba(255, 255, 255, 0.6);
            --border-radius: 15px;
            --border-radius-small: 8px;
            --transition: all 0.3s ease;
            --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
            --shadow-hover: 0 15px 40px rgba(0, 0, 0, 0.4);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Noto Sans SC', sans-serif;
            background: var(--dark-bg);
            color: var(--text-primary);
            overflow-x: hidden;
            min-height: 100vh;
            line-height: 1.6;
        }
        
        /* 工具类 */
        .glass {
            background: var(--glass-bg);
            backdrop-filter: blur(20px);
            border: 1px solid var(--glass-border);
        }
        
        .gradient-text {
            background: linear-gradient(135deg, var(--text-primary), var(--primary-color));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        
        .btn-primary {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border: none;
            color: var(--text-primary);
            font-weight: 600;
            transition: var(--transition);
            cursor: pointer;
        }
        
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(255, 107, 53, 0.4);
        }
        
        /* 导航栏 - 居中对齐优化 */
        .navbar {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            background: rgba(0, 0, 0, 0.9);
            backdrop-filter: blur(15px);
            padding: 12px 0;
            z-index: 1000;
            border-bottom: 1px solid var(--glass-border);
            transition: var(--transition);
        }
        
        .nav-container {
            max-width: 1400px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr auto 1fr;
            align-items: center;
            padding: 0 30px;
            gap: 20px;
        }
        
        .nav-left {
            justify-self: start;
            display: flex;
            align-items: center;
        }
        
        .nav-center {
            justify-self: center;
            display: flex;
            align-items: center;
        }
        
        .nav-right {
            justify-self: end;
            display: flex;
            align-items: center;
            gap: 15px;
        }
        
        .logo-container {
            display: flex;
            align-items: center;
            text-decoration: none;
            transition: all 0.3s ease;
        }
        
        .logo-container:hover {
            transform: scale(1.05);
        }
        
        .logo-container img {
            max-height: 40px;
            width: auto;
            transition: all 0.3s ease;
        }
        
        .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            text-decoration: none;
        }
        
        .logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            text-decoration: none;
        }
        
        .nav-menu {
            display: flex;
            list-style: none;
            gap: 35px;
        }
        
        .nav-menu a {
            color: var(--text-secondary);
            text-decoration: none;
            font-weight: 500;
            font-size: 14px;
            transition: var(--transition);
            position: relative;
            padding: 8px 4px;
            display: inline-block;
        }
        
        .nav-menu a:hover {
            color: var(--text-primary);
        }
        
        .nav-menu a::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 0;
            height: 2px;
            background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
            transition: all 0.3s ease;
            transform: translateX(-50%);
        }
        
        .nav-menu a:hover::after,
        .nav-menu a.active::after {
            width: 100%;
        }
        
        .nav-menu a.active {
            color: var(--primary-color);
        }
        
        .nav-special {
            color: var(--primary-color);
            font-weight: 600;
            font-size: 14px;
        }
        
        .auth-buttons {
            display: flex;
            gap: 10px;
        }
        
        .auth-btn {
            padding: 8px 20px;
            border: 1px solid rgba(255, 255, 255, 0.3);
            background: transparent;
            color: var(--text-primary);
            text-decoration: none;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 500;
            transition: var(--transition);
        }
        
        .auth-btn:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.5);
            transform: translateY(-1px);
        }
        
        .auth-btn.register {
            background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
            border: none;
        }
        
        .auth-btn.register:hover {
            transform: translateY(-1px);
            box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
        }
        
        /* 页面内容样式 */
        .nav-right {
            display: flex;
            align-items: center;
            gap: 15px;
        }
        
        .nav-special {
            color: #ff6b35;
            font-weight: 600;
            font-size: 14px;
        }
        
        .auth-buttons {
            display: flex;
            gap: 10px;
        }
        
        .auth-btn {
            padding: 8px 20px;
            border: 1px solid rgba(255, 255, 255, 0.3);
            background: transparent;
            color: white;
            text-decoration: none;
            border-radius: 20px;
            font-size: 13px;
            font-weight: 500;
            transition: all 0.3s ease;
        }
        
        .auth-btn:hover {
            background: rgba(255, 255, 255, 0.1);
            border-color: rgba(255, 255, 255, 0.5);
        }
        
        .auth-btn.register {
            background: linear-gradient(135deg, #ff6b35, #f7931e);
            border: none;
        }
        
        .auth-btn.register:hover {
            transform: translateY(-1px);
            box-shadow: 0 4px 15px rgba(255, 107, 53, 0.3);
        }
        
        /* 主要内容区域 */
        .main-container {
            min-height: 100vh;
            background: linear-gradient(135deg, #0a0a0a 0%, #1a1a2e 50%, #16213e 100%);
            position: relative;
            overflow: hidden;
        }
        
        .background-effects {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            z-index: 1;
        }
        
        .bg-gradient {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: radial-gradient(circle at 30% 20%, rgba(255, 107, 53, 0.1) 0%, transparent 50%),
                        radial-gradient(circle at 70% 80%, rgba(247, 147, 30, 0.1) 0%, transparent 50%);
        }
        
        /* 页面头部 */
        .page-header {
            position: relative;
            padding: 120px 30px 80px;
            text-align: center;
            z-index: 10;
        }
        
        .page-title {
            font-size: 3.5rem;
            font-weight: 900;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #ffffff, #ff6b35);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.1;
        }
        
        .page-subtitle {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.7);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.6;
        }
        
        /* 内容区域 */
        .content-section {
            position: relative;
            z-index: 10;
            padding: 80px 30px;
            max-width: 1200px;
            margin: 0 auto;
        }
        
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
            margin-bottom: 80px;
        }
        
        .content-text h3 {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 20px;
            color: #ff6b35;
        }
        
        .content-text p {
            font-size: 1.1rem;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.8);
            margin-bottom: 20px;
        }
        
        .content-image {
            position: relative;
        }
        
        .content-image img {
            width: 100%;
            height: auto;
            border-radius: 15px;
            box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
        }
        
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-top: 60px;
        }
        
        .feature-card {
            background: rgba(255, 255, 255, 0.05);
            backdrop-filter: blur(20px);
            border: 1px solid rgba(255, 255, 255, 0.1);
            border-radius: 15px;
            padding: 30px;
            text-align: center;
            transition: all 0.3s ease;
        }
        
        .feature-card:hover {
            transform: translateY(-5px);
            background: rgba(255, 255, 255, 0.08);
            border-color: rgba(255, 107, 53, 0.3);
        }
        
        .feature-icon {
            font-size: 3rem;
            color: #ff6b35;
            margin-bottom: 20px;
        }
        
        .feature-title {
            font-size: 1.3rem;
            font-weight: 600;
            margin-bottom: 15px;
            color: #fff;
        }
        
        .feature-desc {
            color: rgba(255, 255, 255, 0.7);
            line-height: 1.6;
        }
        
        /* 标准化页脚 */
        .standard-footer {
            background: linear-gradient(135deg, var(--dark-secondary) 0%, var(--dark-tertiary) 100%);
            border-top: 1px solid var(--glass-border);
            padding: 50px 0 20px;
            margin-top: 60px;
        }
        
        .footer-container {
            max-width: 1400px;
            margin: 0 auto;
            padding: 0 30px;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 40px;
        }
        
        .footer-section {
            color: var(--text-secondary);
        }
        
        .footer-title {
            color: var(--text-primary);
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 20px;
            position: relative;
        }
        
        .footer-title::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 0;
            width: 30px;
            height: 2px;
            background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
        }
        
        .footer-links {
            list-style: none;
            padding: 0;
        }
        
        .footer-links li {
            margin-bottom: 12px;
        }
        
        .footer-links a {
            color: var(--text-secondary);
            text-decoration: none;
            font-size: 14px;
            transition: var(--transition);
        }
        
        .footer-links a:hover {
            color: var(--primary-color);
            padding-left: 5px;
        }
        
        .footer-bottom {
            border-top: 1px solid var(--glass-border);
            margin-top: 40px;
            padding-top: 20px;
            text-align: center;
        }
        
        .footer-copyright {
            color: var(--text-muted);
            font-size: 12px;
            line-height: 1.6;
        }
        
        .footer-copyright p {
            margin: 5px 0;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .nav-menu {
                display: none;
            }
            
            .nav-container {
                padding: 0 20px;
            }
            
            .page-title {
                font-size: 2.5rem;
            }
            
            .content-grid {
                grid-template-columns: 1fr;
                gap: 40px;
            }
            
            .content-section {
                padding: 60px 20px;
            }
            
            .features-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }
        
        /* 动画效果 */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .fade-in {
            animation: fadeInUp 0.8s ease forwards;
        }
        
        .delay-1 { animation-delay: 0.2s; }
        .delay-2 { animation-delay: 0.4s; }
        .delay-3 { animation-delay: 0.6s; }