:root {
            --neon-orange: #FF5F1F;
            --dark-gray: #222222;
            --medium-gray: #333333;
            --light-gray: #444444;
            --text-light: #EEEEEE;
            --text-muted: #AAAAAA;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Arial, sans-serif;
        }
        
        body {
            background-color: var(--dark-gray);
            color: var(--text-light);
            line-height: 1.6;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 头部样式 */
        header {
            background-color: var(--medium-gray);
            padding: 20px 0;
            border-bottom: 3px solid var(--neon-orange);
        }
        
        .logo {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--neon-orange);
            text-transform: uppercase;
            letter-spacing: 3px;
        }
        
        .logo span {
            color: var(--text-light);
        }
        
        nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .nav-links {
            display: flex;
            list-style: none;
        }
        
        .nav-links li {
            margin-left: 30px;
        }
        
        .nav-links a {
            color: var(--text-light);
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
            transition: color 0.3s;
        }
        
        .nav-links a:hover {
            color: var(--neon-orange);
        }
        
        /* 英雄区域 */
        .hero {
            background: linear-gradient(rgba(0, 0, 0, 0.7), rgba(0, 0, 0, 0.7)), url('https://images.unsplash.com/photo-1571019613454-1cb2f99b2d8b?ixlib=rb-1.2.1&auto=format&fit=crop&w=1350&q=80');
            background-size: cover;
            background-position: center;
            height: 500px;
            display: flex;
            align-items: center;
            text-align: center;
            color: white;
        }
        
        .hero-content h1 {
            font-size: 3.5rem;
            margin-bottom: 20px;
            text-transform: uppercase;
        }
        
        .hero-content p {
            font-size: 1.2rem;
            margin-bottom: 30px;
            max-width: 800px;
            margin-left: auto;
            margin-right: auto;
        }
        
        /* 蛋白粉勺形状按钮 */
        .btn {
            display: inline-block;
            padding: 12px 30px;
            background-color: var(--neon-orange);
            color: var(--text-light);
            text-decoration: none;
            font-weight: bold;
            border-radius: 25px 25px 5px 25px;
            position: relative;
            overflow: hidden;
            transition: all 0.3s;
            border: none;
            cursor: pointer;
            text-transform: uppercase;
            font-size: 0.9rem;
            letter-spacing: 1px;
        }
        
        .btn:hover {
            background-color: #ff4500;
            transform: translateY(-3px);
            box-shadow: 0 10px 20px rgba(255, 95, 31, 0.3);
        }
        
        .btn:active {
            transform: translateY(-1px);
        }
        
        .btn::after {
            content: "";
            display: block;
            width: 30px;
            height: 30px;
            background-color: rgba(255, 255, 255, 0.2);
            position: absolute;
            top: -10px;
            right: -10px;
            border-radius: 50%;
        }
        
        /* 仪表板部分 */
        .dashboard {
            padding: 80px 0;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 50px;
            position: relative;
        }
        
        .section-title h2 {
            font-size: 2.5rem;
            color: var(--neon-orange);
            display: inline-block;
            position: relative;
            padding-bottom: 15px;
        }
        
        .section-title h2::after {
            content: "";
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 3px;
            background-color: var(--neon-orange);
        }
        
        /* 体脂计算器 */
        .fat-calculator {
            background-color: var(--medium-gray);
            padding: 30px;
            border-radius: 10px;
            margin-bottom: 50px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
        }
        
        .calculator-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 20px;
        }
        
        .input-group {
            margin-bottom: 20px;
        }
        
        .input-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
        }
        
        .input-group input, .input-group select {
            width: 100%;
            padding: 12px;
            background-color: var(--light-gray);
            border: 1px solid #555;
            border-radius: 5px;
            color: var(--text-light);
        }
        
        .result {
            background-color: var(--light-gray);
            padding: 20px;
            border-radius: 5px;
            margin-top: 20px;
            text-align: center;
            display: none;
        }
        
        .result h3 {
            color: var(--neon-orange);
            margin-bottom: 10px;
        }
        
        /* 课程表能量条 */
        .schedule {
            background-color: var(--medium-gray);
            padding: 30px;
            border-radius: 10px;
            margin-bottom: 50px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
        }
        
        .energy-bars {
            margin-top: 30px;
        }
        
        .energy-bar {
            margin-bottom: 15px;
        }
        
        .energy-bar-label {
            display: flex;
            justify-content: space-between;
            margin-bottom: 5px;
        }
        
        .energy-bar-container {
            height: 20px;
            background-color: var(--light-gray);
            border-radius: 10px;
            overflow: hidden;
        }
        
        .energy-bar-fill {
            height: 100%;
            background: linear-gradient(90deg, var(--neon-orange), #FF8C00);
            border-radius: 10px;
            transition: width 0.5s ease-out;
        }
        
        /* 教练肌肉解剖图 */
        .coaches {
            margin-bottom: 50px;
        }
        
        .coach-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
        }
        
        .coach-card {
            background-color: var(--medium-gray);
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
            transition: transform 0.3s;
        }
        
        .coach-card:hover {
            transform: translateY(-10px);
        }
        
        .coach-image {
            position: relative;
            height: 250px;
            overflow: hidden;
        }
        
        .coach-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }
        
        .coach-card:hover .coach-image img {
            transform: scale(1.1);
        }
        
        .muscle-map {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            opacity: 0;
            transition: opacity 0.3s;
            background-size: contain;
            background-repeat: no-repeat;
            background-position: center;
        }
        
        .coach-card:hover .muscle-map {
            opacity: 0.8;
        }
        
        .coach-info {
            padding: 20px;
            text-align: center;
        }
        
        .coach-info h3 {
            color: var(--neon-orange);
            margin-bottom: 5px;
        }
        
        .coach-info p {
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        
        /* 用户打卡排行榜 */
        .leaderboard {
            background-color: var(--medium-gray);
            padding: 30px;
            border-radius: 10px;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
        }
        
        .leaderboard-table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 20px;
        }
        
        .leaderboard-table th, .leaderboard-table td {
            padding: 12px 15px;
            text-align: left;
            border-bottom: 1px solid var(--light-gray);
        }
        
        .leaderboard-table th {
            background-color: var(--light-gray);
            color: var(--neon-orange);
            font-weight: 600;
            text-transform: uppercase;
            font-size: 0.8rem;
            letter-spacing: 1px;
        }
        
        .leaderboard-table tr:hover {
            background-color: var(--light-gray);
        }
        
        .rank {
            font-weight: bold;
            color: var(--neon-orange);
        }
        
        /* 文章列表 */
        .articles {
            padding: 80px 0;
            background-color: var(--medium-gray);
        }
        
        .article-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-top: 40px;
        }
        
        .article-card {
            background-color: var(--dark-gray);
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
            transition: transform 0.3s;
        }
        
        .article-card:hover {
            transform: translateY(-10px);
        }
        
        .article-image {
            height: 200px;
            overflow: hidden;
        }
        
        .article-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s;
        }
        
        .article-card:hover .article-image img {
            transform: scale(1.1);
        }
        
        .article-content {
            padding: 20px;
        }
        
        .article-content h3 {
            color: var(--neon-orange);
            margin-bottom: 10px;
            font-size: 1.3rem;
        }
        
        .article-content p {
            color: var(--text-muted);
            margin-bottom: 15px;
            font-size: 0.9rem;
        }
        
        .article-meta {
            display: flex;
            justify-content: space-between;
            color: var(--text-muted);
            font-size: 0.8rem;
        }
        
        /* 页脚 */
        footer {
            background-color: var(--dark-gray);
            padding: 50px 0 20px;
            border-top: 3px solid var(--neon-orange);
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }
        
        .footer-column h3 {
            color: var(--neon-orange);
            margin-bottom: 20px;
            font-size: 1.2rem;
        }
        
        .footer-column ul {
            list-style: none;
        }
        
        .footer-column ul li {
            margin-bottom: 10px;
        }
        
        .footer-column a {
            color: var(--text-muted);
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-column a:hover {
            color: var(--neon-orange);
        }
        
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid var(--light-gray);
            color: var(--text-muted);
            font-size: 0.9rem;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            
            .hero-content h1 {
                font-size: 2.5rem;
            }
            
            .section-title h2 {
                font-size: 2rem;
            }
        }