/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 基础样式 */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #f5f5f7;
    color: #1d1d1f;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* 导航栏样式 */
.navbar {
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 600;
    background: linear-gradient(90deg, #007AFF, #5856D6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: #1d1d1f;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: #007AFF;
}

/* 主内容区样式 */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 6rem 2rem 2rem;
}

/* 欢迎区域样式 */
.hero {
    text-align: center;
    padding: 4rem 0;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(90deg, #007AFF, #5856D6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.2rem;
    color: #86868b;
}

/* 功能展示区样式 */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 2rem;
    margin: 4rem 0;
    justify-items: center;
}

/* 首页功能卡片：正方形苹果风格 */
.feature-card {
    width: 260px;
    height: 260px;
    background: white;
    border-radius: 32px;
    box-shadow: 0 8px 24px rgba(0,0,0,0.10);
    padding: 1.5rem 1.2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    transition: transform 0.3s cubic-bezier(.4,0,.2,1), box-shadow 0.3s;
    margin: 0 auto;
}

.feature-card:hover {
    transform: translateY(-8px) scale(1.03);
    box-shadow: 0 16px 32px rgba(0,122,255,0.12);
}

.feature-icon {
    font-size: 2.6rem;
    margin-bottom: 0.5rem;
}

.feature-card h2 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    color: #1d1d1f;
    font-weight: 600;
}

.feature-card p {
    color: #86868b;
    margin-bottom: 0.7rem;
    font-size: 1rem;
}

.feature-list {
    list-style: none;
    margin-bottom: 1rem;
    text-align: left;
    padding: 0;
    width: 100%;
}

.feature-list li {
    margin-bottom: 0.3rem;
    color: #1d1d1f;
    padding-left: 1.5rem;
    position: relative;
    font-size: 0.98rem;
}

.feature-list li::before {
    content: "✓";
    color: #007AFF;
    position: absolute;
    left: 0;
}

.feature-btn {
    display: inline-block;
    background: linear-gradient(90deg, #007AFF, #5856D6);
    color: white;
    text-decoration: none;
    padding: 0.7rem 1.6rem;
    border-radius: 25px;
    font-weight: 500;
    font-size: 1rem;
    margin-top: 0.5rem;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 2px 8px rgba(0,122,255,0.10);
}

.feature-btn:hover {
    transform: translateY(-2px) scale(1.04);
    box-shadow: 0 4px 16px rgba(0, 122, 255, 0.18);
}

/* 响应式：小屏幕下卡片自动缩小并换行 */
@media (max-width: 900px) {
    .feature-card {
        width: 180px;
        height: 180px;
        padding: 1rem 0.5rem;
    }
    .features {
        gap: 1.2rem;
    }
}
@media (max-width: 600px) {
    .feature-card {
        width: 98vw;
        height: auto;
        min-height: 160px;
        padding: 1rem 0.2rem;
    }
    .features {
        grid-template-columns: 1fr;
        gap: 0.8rem;
    }
}

/* 使用流程样式 */
.workflow {
    text-align: center;
    margin: 4rem 0;
}

.workflow h2 {
    font-size: 2rem;
    margin-bottom: 3rem;
    color: #1d1d1f;
}

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

.step {
    padding: 2rem;
    background: white;
    border-radius: 15px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.step-number {
    width: 40px;
    height: 40px;
    background: linear-gradient(90deg, #007AFF, #5856D6);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-weight: 600;
}

.step h3 {
    margin-bottom: 0.5rem;
    color: #1d1d1f;
}

.step p {
    color: #86868b;
}

/* 优势特点样式 */
.advantages {
    text-align: center;
    margin: 4rem 0;
}

.advantages h2 {
    font-size: 2rem;
    margin-bottom: 3rem;
    color: #1d1d1f;
}

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

.advantage-item {
    padding: 2rem;
    background: white;
    border-radius: 15px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.advantage-item:hover {
    transform: translateY(-5px);
}

.advantage-item h3 {
    margin-bottom: 0.5rem;
    color: #1d1d1f;
}

.advantage-item p {
    color: #86868b;
}

/* 页脚样式 */
.footer {
    background: white;
    padding: 2rem 0;
    margin-top: 4rem;
    text-align: center;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.footer p {
    color: #86868b;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        flex-direction: column;
        gap: 1rem;
        text-align: center;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .features {
        grid-template-columns: 1fr;
    }

    .workflow-steps {
        grid-template-columns: 1fr;
    }

    .advantages-grid {
        grid-template-columns: 1fr;
    }
}