* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Noto Sans SC', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        
        :root {
            --primary-color: #e6f7ff;
            --secondary-color: #b3e0ff;
            --accent-color: #5cb3ff;
            --dark-accent: #3a7bbd;
            --text-color: #1a3c5a;
            --light-text: #5a7a9a;
            --card-bg: #ffffff;
            --phase-bg: #f0f9ff;
            --breakthrough-bg: #e6f2ff;
            --shadow: 0 4px 20px rgba(92, 179, 255, 0.15);
            --hover-color: #d1edff;
        }
        
        body {
            background: linear-gradient(135deg, #f0f9ff, #e0f2ff);
            color: var(--text-color);
            min-height: 100vh;
            padding: 20px;
            line-height: 1.6;
        }
        
        .container {
            max-width: 1200px;
            margin: 0 auto;
        }
        
        header {
            text-align: center;
            padding: 40px 0 30px;
            animation: fadeIn 1s ease;
        }
        
        header h1 {
            font-size: 2.8rem;
            margin-bottom: 15px;
            color: var(--text-color);
            text-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
            font-weight: 700;
        }
        
        header p {
            font-size: 1.2rem;
            max-width: 700px;
            margin: 0 auto;
            line-height: 1.6;
            color: #2c577a;
        }
        
        .year-badge {
            display: inline-block;
            background: var(--accent-color);
            color: white;
            padding: 10px 30px;
            border-radius: 40px;
            font-weight: 800;
            margin-top: 30px;
            box-shadow: var(--shadow);
        }
        
        /* 下拉选择区域样式 */
        .project-selector {
            background: white;
            border-radius: 16px;
            padding: 30px;
            margin: 40px auto;
            max-width: 800px;
            box-shadow: var(--shadow);
            animation: slideUp 0.8s ease;
            border: 1px solid var(--secondary-color);
        }
        
        .selector-title {
            text-align: center;
            margin-bottom: 25px;
            color: var(--text-color);
            font-size: 1.5rem;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .selector-title i {
            margin-right: 12px;
            color: var(--accent-color);
        }
        
        .project-dropdown {
            width: 100%;
            padding: 15px 20px;
            border: 2px solid var(--secondary-color);
            border-radius: 12px;
            background: var(--primary-color);
            font-size: 1.1rem;
            color: var(--text-color);
            cursor: pointer;
            transition: all 0.3s ease;
            appearance: none;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='%235cb3ff'%3E%3Cpath d='M7 10l5 5 5-5z'/%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: right 20px center;
            background-size: 20px;
            font-weight: 500;
        }
        
        .project-dropdown:hover {
            background-color: var(--hover-color);
            border-color: var(--accent-color);
        }
        
        .project-dropdown:focus {
            outline: none;
            box-shadow: 0 0 0 3px rgba(92, 179, 255, 0.3);
        }
        
        .dropdown-container {
            position: relative;
            margin-bottom: 30px;
        }
        
        .dropdown-label {
            position: absolute;
            top: -10px;
            left: 15px;
            background: white;
            padding: 0 8px;
            font-size: 0.9rem;
            color: var(--accent-color);
            font-weight: 600;
        }
        
        .selector-description {
            text-align: center;
            font-size: 1.05rem;
            color: var(--light-text);
            line-height: 1.6;
            max-width: 600px;
            margin: 0 auto;
        }
        
        .details-section {
            background: white;
            border-radius: 16px;
            padding: 40px;
            margin: 40px 0 60px;
            box-shadow: var(--shadow);
            animation: fadeIn 1s ease;
            position: relative;
            border: 1px solid var(--secondary-color);
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 40px;
            color: var(--text-color);
            position: relative;
            padding-bottom: 15px;
        }
        
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 80px;
            height: 4px;
            background: var(--accent-color);
            border-radius: 2px;
        }
        
        .project-detail {
            margin-bottom: 60px;
            padding: 30px;
            border-radius: 12px;
            background: var(--card-bg);
            box-shadow: 0 4px 15px rgba(92, 179, 255, 0.1);
            transition: all 0.3s ease;
            border-left: 4px solid var(--accent-color);
        }
        
        .project-detail:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 25px rgba(92, 179, 255, 0.2);
        }
        
        .project-detail h3 {
            font-size: 1.8rem;
            color: var(--text-color);
            margin-bottom: 15px;
            display: flex;
            align-items: center;
        }
        
        .project-detail h3 i {
            margin-right: 12px;
            color: var(--accent-color);
        }
        
        .project-overview {
            display: flex;
            margin-bottom: 30px;
            gap: 30px;
        }
        
        .overview-text {
            flex: 1;
        }
        
        .project-stats {
            flex: 0 0 300px;
            background: var(--phase-bg);
            border-radius: 12px;
            padding: 20px;
            border: 1px solid var(--secondary-color);
        }
        
        .stat-item {
            display: flex;
            justify-content: space-between;
            padding: 10px 0;
            border-bottom: 1px dashed var(--secondary-color);
        }
        
        .stat-item:last-child {
            border-bottom: none;
        }
        
        .stat-label {
            color: var(--light-text);
            font-weight: 500;
        }
        
        .stat-value {
            font-weight: 600;
            color: var(--dark-accent);
        }
        
        .project-detail p {
            line-height: 1.7;
            margin-bottom: 20px;
            color: var(--light-text);
        }
        
        .project-detail ul {
            padding-left: 20px;
            margin: 15px 0;
        }
        
        .project-detail li {
            margin-bottom: 10px;
            line-height: 1.6;
        }
        
        /* 项目阶段样式 */
        .project-phases {
            margin: 40px 0;
        }
        
        .phases-title {
            text-align: center;
            margin-bottom: 30px;
            position: relative;
            padding-bottom: 15px;
            color: var(--text-color);
            font-size: 1.5rem;
        }
        
        .phases-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 3px;
            background: var(--accent-color);
            border-radius: 2px;
        }
        
        .phases-container {
            display: flex;
            gap: 30px;
            margin-bottom: 40px;
        }
        
        .phase-card {
            flex: 1;
            background: var(--phase-bg);
            border-radius: 12px;
            padding: 25px;
            border: 1px solid var(--secondary-color);
            transition: all 0.3s ease;
        }
        
        .phase-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow);
        }
        
        .phase-title {
            display: flex;
            align-items: center;
            margin-bottom: 20px;
            color: var(--dark-accent);
        }
        
        .phase-title i {
            margin-right: 10px;
            background: var(--accent-color);
            color: white;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        
        .phase-content h4 {
            font-size: 1.3rem;
            margin-bottom: 15px;
            color: var(--text-color);
        }
        
        .breakthroughs {
            margin-top: 20px;
        }
        
        .breakthrough {
            background: var(--breakthrough-bg);
            border-radius: 10px;
            padding: 18px;
            margin-bottom: 15px;
            border-left: 3px solid var(--accent-color);
        }
        
        .breakthrough h5 {
            display: flex;
            align-items: center;
            margin-bottom: 10px;
            color: var(--dark-accent);
        }
        
        .breakthrough h5 i {
            margin-right: 8px;
            color: var(--accent-color);
        }
        
        .breakthrough p {
            color: var(--light-text);
            font-size: 0.95rem;
            line-height: 1.6;
        }
        
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: var(--accent-color);
            color: white;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            box-shadow: 0 4px 15px rgba(92, 179, 255, 0.4);
            cursor: pointer;
            opacity: 0;
            transition: all 0.3s ease;
            z-index: 100;
        }
        
        .back-to-top.show {
            opacity: 1;
        }
        
        footer {
            text-align: center;
            padding: 30px 0;
            color: var(--light-text);
            font-size: 0.95rem;
            border-top: 1px solid var(--secondary-color);
            margin-top: 20px;
        }
        
        /* Animations */
        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }
        
        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translateY(30px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        /* Responsive design */
        @media (max-width: 768px) {
            header h1 {
                font-size: 2.2rem;
            }
            
            .project-selector {
                padding: 20px;
            }
            
            .selector-title {
                font-size: 1.3rem;
            }
            
            .project-dropdown {
                padding: 12px 15px;
                font-size: 1rem;
            }
            
            .details-section {
                padding: 25px;
            }
            
            .project-detail {
                padding: 20px;
            }
            
            .project-detail h3 {
                font-size: 1.5rem;
            }
            
            .project-overview {
                flex-direction: column;
            }
            
            .project-stats {
                width: 100%;
            }
            
            .phases-container {
                flex-direction: column;
            }
        }
    

/* h5/li 字体颜色统一（团体赛）*/
.breakthrough h5 { font-size: 1rem; font-weight: 600; }
.project-detail li { font-size: 0.95rem; color: var(--light-text); }