/* 基础样式 */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
    overflow: auto;
    min-height: 100vh;
}

/* 导航菜单样式 */
header {
    padding-top: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 100%;
    margin: 0 auto;
    gap: 4rem;
    padding: 20px 1rem 0;
}

/* 导航菜单样式 */
.nav-menu {
    list-style: none;
    padding: 0;
    margin: 0 0 0 auto;
    background-color: transparent;
    display: flex;
    gap: 2rem;
}

.nav-menu li.active {
    background-color: #f0f0f0;
    border-radius: 4px;
}

.logo {
    width: 250px;
    height: 100px;
    max-width: 100%;
}

.logo-section {
    flex: 1; /* 自动填充左侧空间 */
  }
  
.nav-menu li {
    margin: 0;
}

.nav-menu a {
    text-decoration: none;
    color: #333;
    font-weight: 500;
}

/* 内容区块样式 */
.content-block {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.content-block h2 {
    text-align: center;
}

/* 占位提示样式 */
.placeholder {
    background-color: #f4f4f4;
    padding: 2rem;
    text-align: center;
    color: #666;
}

.banner {
    text-align: center;
    padding: 6rem 0;
    background-image: url("images/polygonal19.jpg");
    height: 300px;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 2rem;
    padding: 2rem;
    max-height: 80vh;
    overflow-y: auto;
}

.product-detail {
    margin-top: 80px;
    padding-left: 50px;
    display: flex;
    gap: 20px;
}

.card {
    min-height: 380px;
    height: auto;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.card-img {
    height: 200px;
    object-fit: cover;
}

.card-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.card-title {
    height: 60px;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    line-clamp: 2;
    -webkit-box-orient: vertical;
}
.product-card {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    padding: 1.5rem;
    transition: transform 0.3s ease;
    cursor: pointer;
    text-align: center;
}

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

.product-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    margin-bottom: 1rem;
    border-radius: 8px;
}

.product-item h3 {
    font-size: 1.1rem;
    color: #333;
    margin-bottom: 0.5rem;
}

.product-item p {
    font-size: 0.9rem;
    color: #666;
    line-height: 1.5;
}

@media (max-width: 1200px) {
    .product-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .product-grid {
        grid-template-columns: repeat(2, 1fr);
        padding: 1rem;
    }
}

@media (max-width: 480px) {
    .product-grid {
        grid-template-columns: 1fr;
    }
}

/* 联系表单样式 */
.contact-form {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
}

.form-row {
    display: flex;
    gap: 30px;
    margin-bottom: 20px;
}

.form-group {
    flex: 1;
    padding: 0 10px;
}

.form-group.full-width {
    flex: 0 0 100%;
}

.contact-form label {
    display: block;
    margin-bottom: 8px;
    color: #333;
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 14px;
}

.submit-btn {
    background-color: #007bff;
    color: white;
    padding: 12px 24px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    display: block;
    margin: 20px auto 0;
}

.submit-btn:hover {
    background-color: #0056b3;
}

/* 页脚样式 */
footer {
    position: relative;
    margin-top: auto;
    background-color: #fff;
    color: #333;
    text-align: center;
    padding: 10px 0;
    width: 100%;
}

footer .nav-menu{
    justify-content: center;
}

main {
    padding: 20px 0 100px;
    min-height: calc(100vh - 160px);
}

.login-form {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 400px;
    padding: 30px;
    background: white;
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.12);
    z-index: 1000;
}

.login-form h2 {
    text-align: center;
    margin-bottom: 25px;
    color: #2c3e50;
}

.login-form button[type="submit"] {
    width: 100%;
    padding: 12px;
    background: #3498db;
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: background 0.3s ease;
}

.login-form button[type="submit"]:hover {
    background: #2980b9;
}

.form-group {
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-weight: 500;
    color: #34495e;
}

.form-group input {
    padding: 10px;
    border: 2px solid #ecf0f1;
    border-radius: 4px;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    border-color: #3498db;
    outline: none;
}
/* 首页三栏布局样式 */
.content-section {
    display: flex;
    justify-content: space-around;
    gap: 0.5rem;
    padding: 2rem 0;
}

.content-card {
    flex: 1;
    max-width: 300px;
    background: #ffffff;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.content-card:hover {
    transform: translateY(-5px);
}

.product-login-link {
    display: block;
    background: #3498db;
    color: white;
    padding: 12px 24px;
    border-radius: 6px;
    text-align: center;
    text-decoration: none;
    transition: background 0.3s ease;
}

.product-login-link:hover {
    background: #2980b9;
}

.form-group {
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-weight: 500;
    color: #34495e;
}

.form-group input {
    padding: 10px;
    border: 2px solid #ecf0f1;
    border-radius: 4px;
    transition: border-color 0.3s ease;
}

.form-group input:focus {
    border-color: #3498db;
    outline: none;
}