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

body {
    font-family: Arial, sans-serif;
    background-color: #F5F7FA;
    color: #333333;
}

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

/* 顶部导航栏 */
.navbar {
    background-color: #FFFFFF;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.navbar-brand .logo {
    font-size: 24px;
    font-weight: bold;
    color: #165DFF;
}

.navbar-menu {
    display: flex;
    gap: 30px;
}

.nav-item {
    text-decoration: none;
    color: #333333;
    font-size: 16px;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-item:hover {
    color: #165DFF;
}

/* Banner 区域 */
.banner {
    background-color: #165DFF;
    color: #FFFFFF;
    text-align: center;
    padding: 100px 0;
}

.banner h1 {
    font-size: 48px;
    margin-bottom: 20px;
    font-weight: bold;
}

.banner p {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.9;
}

.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s;
    border: none;
}

.btn-primary {
    background-color: #165DFF;
    color: #FFFFFF;
}

.btn-primary:hover {
    background-color: #0E47D9;
    transform: translateY(-2px);
}

.btn-success {
    background-color: #00B42A;
    color: #FFFFFF;
}

.btn-success:hover {
    background-color: #00A127;
    transform: translateY(-2px);
}

/* 功能卡片区 */
.features {
    padding: 80px 0;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
    gap: 30px;
}

.feature-card {
    background-color: #FFFFFF;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    padding: 30px;
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
}

.feature-card h3 {
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 15px;
    color: #165DFF;
}

.feature-card p {
    font-size: 14px;
    color: #666666;
    margin-bottom: 10px;
}

/* 上传区域 */
.upload-area {
    border: 2px dashed #E5E6EB;
    border-radius: 8px;
    padding: 40px;
    text-align: center;
    margin: 20px 0;
    cursor: pointer;
    transition: border-color 0.3s;
}

.upload-area:hover {
    border-color: #165DFF;
}

.upload-area p {
    margin: 0;
    color: #999999;
}

.file-input {
    display: none;
}

/* 文本输入区域 */
.text-input-area {
    margin: 20px 0;
}

.text-input-area textarea {
    width: 100%;
    padding: 15px;
    border: 1px solid #E5E6EB;
    border-radius: 8px;
    resize: vertical;
    min-height: 200px;
    font-size: 14px;
    font-family: Arial, sans-serif;
}

/* 文本工具按钮 */
.text-tools {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.text-tool-btn {
    flex: 1;
    min-width: 120px;
}

/* 结果区域 */
.result-area {
    margin-top: 20px;
    padding: 20px;
    background-color: #F0F7FF;
    border-radius: 8px;
    text-align: center;
}

.status {
    margin-bottom: 15px;
    font-size: 14px;
    color: #333333;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar-menu {
        display: none;
    }

    .banner h1 {
        font-size: 36px;
    }

    .banner p {
        font-size: 18px;
    }

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

    .feature-card {
        padding: 20px;
    }

    .text-tools {
        flex-direction: column;
    }

    .text-tool-btn {
        width: 100%;
    }
}

@media (max-width: 480px) {
    .banner {
        padding: 60px 0;
    }

    .banner h1 {
        font-size: 28px;
    }

    .banner p {
        font-size: 16px;
    }

    .features {
        padding: 40px 0;
    }

    .upload-area {
        padding: 20px;
    }
}