/* 重置样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 1rem 0;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.nav-brand h1 {
    font-size: 1.8rem;
    font-weight: bold;
}


/* 桌面端菜单 */
.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    transition: none;
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
    z-index: 1001;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-menu a:hover {
    color: #ffd700;
}

/* 主页横幅 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 120px 0 80px;
    text-align: center;
    margin-top: 70px;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    font-weight: bold;
}

.hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-bottom: 2rem;
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: bold;
    color: #ffd700;
}

.stat-label {
    font-size: 1rem;
    opacity: 0.9;
}

.cta-button {
    background: linear-gradient(45deg, #ff6b6b, #ee5a24);
    color: white;
    border: none;
    padding: 15px 40px;
    font-size: 1.2rem;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(255, 107, 107, 0.3);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
}

/* 章节通用样式 */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #2d3748;
    position: relative;
}

.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: linear-gradient(45deg, #667eea, #764ba2);
    margin: 1rem auto;
    border-radius: 2px;
}

/* 热门测试区域 */
.popular-tests {
    padding: 80px 0;
    background: white;
}

.test-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.test-card {
    background: white;
    border-radius: 15px;
    padding: 2rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
    border: 1px solid #e2e8f0;
}

.test-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.15);
}

.test-image {
    text-align: center;
    margin-bottom: 1.5rem;
}

.placeholder-img {
    font-size: 4rem;
    width: 100px;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 50%;
    margin: 0 auto;
    color: white;
}

.test-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #2d3748;
}

.test-card p {
    color: #666;
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.test-meta {
    display: flex;
    justify-content: space-between;
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    color: #888;
}

.test-button {
    width: 100%;
    background: linear-gradient(45deg, #667eea, #764ba2);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.test-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

/* 测试介绍 */
.test-intro {
    padding: 80px 0;
    background: #f8f9fa;
}

.intro-content {
    max-width: 1000px;
    margin: 0 auto;
}

.intro-section {
    margin-bottom: 3rem;
}

.intro-section h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: #2d3748;
}

.intro-section p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #555;
}

.dimensions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.dimension-category {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

.dimension-category h4 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #667eea;
}

.dimension-category ul {
    list-style: none;
}

.dimension-category li {
    margin-bottom: 0.5rem;
    color: #555;
    line-height: 1.6;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.feature-item {
    text-align: center;
    padding: 1.5rem;
    background: white;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

.feature-item h4 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
    color: #667eea;
}

.feature-item p {
    color: #666;
    font-size: 0.95rem;
}

/* 测试流程 */
.test-process {
    padding: 80px 0;
    background: white;
}

.process-steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.step {
    text-align: center;
    padding: 2rem;
    background: #f8f9fa;
    border-radius: 15px;
    transition: all 0.3s ease;
}

.step:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.1);
}

.step-number {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    margin: 0 auto 1rem;
}

.step h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #2d3748;
}

.step p {
    color: #666;
    line-height: 1.6;
}

/* 测试类型详解 */
.test-types {
    padding: 80px 0;
    background: #f8f9fa;
}

.type-detail {
    background: white;
    padding: 2rem;
    margin-bottom: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

.type-detail h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #2d3748;
}

.type-detail p {
    color: #666;
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.type-features {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
}

.feature-tag {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 25px;
    font-size: 0.9rem;
    font-weight: 500;
}

/* 用户评价 */
.testimonials {
    padding: 80px 0;
    background: white;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.testimonial {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.08);
}

.user-avatar {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: bold;
    margin: 0 auto 1rem;
}

.testimonial h4 {
    color: #2d3748;
    margin-bottom: 1rem;
}

.testimonial p {
    color: #666;
    line-height: 1.6;
    font-style: italic;
}

/* 常见问题 */
.faq {
    padding: 80px 0;
    background: #f8f9fa;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    margin-bottom: 1rem;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.faq-item h3 {
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: white;
    padding: 1.5rem;
    margin: 0;
    font-size: 1.1rem;
    cursor: pointer;
}

.faq-item p {
    padding: 1.5rem;
    color: #666;
    line-height: 1.7;
    margin: 0;
}

/* 关于我们 */
.about {
    padding: 80px 0;
    background: white;
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.about-content p {
    font-size: 1.1rem;
    line-height: 1.8;
    color: #555;
    margin-bottom: 3rem;
}

.mission-vision {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.mission, .vision {
    background: #f8f9fa;
    padding: 2rem;
    border-radius: 15px;
}

.mission h3, .vision h3 {
    color: #667eea;
    margin-bottom: 1rem;
}

.mission p, .vision p {
    color: #666;
    line-height: 1.6;
    margin: 0;
}

.team-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
}

.stat {
    text-align: center;
}

.stat .number {
    display: block;
    font-size: 2.5rem;
    font-weight: bold;
    color: #667eea;
}

.stat .label {
    color: #666;
    font-size: 1rem;
}

/* 页脚 */
.footer {
    background: #2d3748;
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    margin-bottom: 1rem;
    color: #ffd700;
}

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

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section ul li a {
    color: #cbd5e0;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section ul li a:hover {
    color: #ffd700;
}

.footer-section p {
    color: #cbd5e0;
    line-height: 1.6;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #4a5568;
    color: #a0aec0;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        width: 100%;
        background: rgba(102, 126, 234, 0.98);
        flex-direction: column;
        padding: 20px 0;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all 0.3s ease;
        z-index: 999;
        box-shadow: 0 4px 20px rgba(0,0,0,0.15);
        backdrop-filter: blur(10px);
        gap: 0;
    }
    
    .nav-menu.mobile-active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-menu li {
        margin: 10px 0;
        text-align: center;
    }
    
    .nav-menu a {
        display: block;
        padding: 12px 20px;
        transition: background 0.3s ease;
    }
    
    .nav-menu a:hover {
        background: rgba(255, 255, 255, 0.1);
        border-radius: 8px;
    }
    
    .mobile-menu-btn {
        display: block !important;
    }
    
    .hero-content h1 {
        font-size: 2rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 1rem;
    }
    
    .test-grid {
        grid-template-columns: 1fr;
    }
    
    .dimensions-grid {
        grid-template-columns: 1fr;
    }
    
    .process-steps {
        grid-template-columns: 1fr;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .team-stats {
        flex-direction: column;
        gap: 1rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .test-card {
        padding: 1.5rem;
    }
    
    .type-features {
        justify-content: center;
    }
}

/* 动画效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.test-card,
.step,
.testimonial,
.faq-item {
    animation: fadeInUp 0.6s ease-out;
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #667eea, #764ba2);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #5a67d8, #6b46c1);
}