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

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

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

/* 导航栏样式 */
.header {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.navbar {
    padding: 1rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo h2 {
    color: #007bff;
    font-size: 1.5rem;
    font-weight: bold;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    text-decoration: none;
    color: #333;
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: #333;
    margin: 3px 0;
    transition: 0.3s;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 12px 30px;
    text-decoration: none;
    border-radius: 5px;
    font-weight: 500;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background: #007bff;
    color: white;
}

.btn-primary:hover {
    background: #0056b3;
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: #007bff;
    border: 2px solid #007bff;
}

.btn-secondary:hover {
    background: #007bff;
    color: white;
}

/* 首页横幅样式 */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    min-height: 80vh;
    display: flex;
    align-items: center;
    text-align: center;
    padding-top: 80px;
}

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

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: bold;
    animation: fadeInUp 1s ease;
}

.hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 1s ease 0.2s;
    animation-fill-mode: both;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1s ease 0.4s;
    animation-fill-mode: both;
}

/* 章节样式 */
section {
    padding: 60px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #333;
}

.section-subtitle {
    font-size: 1.1rem;
    color: #666;
    max-width: 600px;
    margin: 0 auto;
}

/* 服务样式 */
.services {
    background: #f8f9fa;
}

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

.service-link {
    text-decoration: none;
    color: inherit;
    display: block;
}

.service-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.service-icon {
    font-size: 3rem;
    color: #007bff;
    margin-bottom: 1rem;
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #333;
}

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

/* 关于我们样式 */
.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.about-text h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: #333;
}

.about-text p {
    margin-bottom: 1rem;
    color: #666;
    line-height: 1.8;
}

.company-stats {
    display: flex;
    gap: 2rem;
    margin-top: 2rem;
}

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

.stat-item h4 {
    font-size: 2rem;
    color: #007bff;
    margin-bottom: 0.5rem;
}

.stat-item p {
    color: #666;
}

.about-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.image-placeholder {
    width: 400px;
    height: 300px;
    background: #f0f0f0;
    border-radius: 10px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 4rem;
    color: #ccc;
}

/* 联系我们样式 */
.contact {
    background: #f8f9fa;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: #007bff;
    color: white;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
}

.contact-details h4 {
    margin-bottom: 0.5rem;
    color: #333;
}

.contact-details p {
    color: #666;
}

.contact-form {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #007bff;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* 页脚样式 */
.footer {
    background: #333;
    color: white;
    padding: 3rem 0 1rem;
}

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

.footer-section h3,
.footer-section h4 {
    margin-bottom: 1rem;
}

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

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

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

.footer-section a:hover {
    color: #007bff;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid #555;
    color: #ccc;
}

.footer-links {
    margin-top: 1rem;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: #999;
    text-decoration: none;
    font-size: 0.9rem;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: #007bff;
}

.footer-links span {
    color: #666;
    font-size: 0.8rem;
}

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

/* 响应式设计 */
@media screen and (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: 0.3s;
        box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
        padding: 2rem 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-item {
        margin: 1rem 0;
    }

    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .hero {
        min-height: 70vh;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .section-title {
        font-size: 2rem;
    }

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

    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .company-stats {
        justify-content: center;
    }

    .contact-content {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-links {
        flex-direction: column;
        gap: 0.5rem;
        font-size: 0.8rem;
    }

    .footer-links span {
        display: none;
    }

    .image-placeholder {
        width: 100%;
        max-width: 300px;
        height: 200px;
    }
}

@media screen and (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .section-title {
        font-size: 1.8rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 200px;
        text-align: center;
    }
}

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 加载动画 */
.service-card,
.stat-item,
.contact-item {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.6s ease forwards;
}

.service-card:nth-child(1) { animation-delay: 0.1s; }
.service-card:nth-child(2) { animation-delay: 0.2s; }
.service-card:nth-child(3) { animation-delay: 0.3s; }
.service-card:nth-child(4) { animation-delay: 0.4s; }
.service-card:nth-child(5) { animation-delay: 0.5s; }
.service-card:nth-child(6) { animation-delay: 0.6s; }

.stat-item:nth-child(1) { animation-delay: 0.2s; }
.stat-item:nth-child(2) { animation-delay: 0.3s; }
.stat-item:nth-child(3) { animation-delay: 0.4s; }

.contact-item:nth-child(1) { animation-delay: 0.1s; }
.contact-item:nth-child(2) { animation-delay: 0.2s; }
.contact-item:nth-child(3) { animation-delay: 0.3s; }

/* 用户认证相关样式 */
.auth-item {
    position: relative;
}

.login-btn {
    background: none;
    border: none;
    color: #333;
    font-weight: 500;
    cursor: pointer;
    transition: color 0.3s ease;
    padding: 0.5rem 1rem;
}

.login-btn:hover {
    color: #007bff;
}

.user-menu {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.username {
    color: #007bff;
    font-weight: 500;
    padding: 0.5rem 0;
}

.user-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    background: white;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    min-width: 150px;
    z-index: 1000;
    overflow: hidden;
}

.user-dropdown a {
    display: block;
    padding: 0.8rem 1rem;
    color: #333;
    text-decoration: none;
    transition: background-color 0.3s ease;
    border-bottom: 1px solid #f0f0f0;
}

.user-dropdown a:last-child {
    border-bottom: none;
}

.user-dropdown a:hover {
    background-color: #f8f9fa;
    color: #007bff;
}

/* 模态框样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
}

.modal-content {
    background-color: white;
    margin: 5% auto;
    padding: 0;
    border-radius: 12px;
    width: 90%;
    max-width: 450px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    animation: modalSlideIn 0.3s ease;
}

@keyframes modalSlideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem;
    border-bottom: 1px solid #e9ecef;
}

.modal-header h3 {
    margin: 0;
    color: #333;
    font-size: 1.5rem;
}

.close {
    color: #aaa;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    line-height: 1;
    transition: color 0.3s ease;
}

.close:hover {
    color: #333;
}

.modal-body {
    padding: 1.5rem;
}

.modal-body .form-group {
    margin-bottom: 1.5rem;
}

.modal-body label {
    display: block;
    margin-bottom: 0.5rem;
    color: #333;
    font-weight: 500;
}

.modal-body input,
.modal-body textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.modal-body input:focus,
.modal-body textarea:focus {
    outline: none;
    border-color: #007bff;
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

.auth-switch {
    text-align: center;
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid #e9ecef;
}

.auth-switch a {
    color: #007bff;
    text-decoration: none;
    font-weight: 500;
    margin-left: 0.5rem;
}

.auth-switch a:hover {
    text-decoration: underline;
}

/* 用户发布内容样式 */
.user-posts {
    background: #f8f9fa;
    padding: 60px 0;
}

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

.post-card {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    border-left: 4px solid #007bff;
}

.post-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.post-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.post-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: #333;
    margin: 0;
    line-height: 1.4;
}

.post-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    color: #666;
}

.post-author {
    font-weight: 500;
    color: #007bff;
}

.post-date {
    color: #888;
}

.post-content {
    color: #555;
    line-height: 1.6;
    overflow: hidden;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
}

.delete-post-btn {
    background: #dc3545;
    color: white;
    border: none;
    border-radius: 4px;
    padding: 0.3rem 0.5rem;
    cursor: pointer;
    font-size: 0.8rem;
    transition: background-color 0.3s ease;
}

.delete-post-btn:hover {
    background: #c82333;
}

.no-posts {
    text-align: center;
    padding: 3rem;
    color: #666;
}

.no-posts i {
    font-size: 3rem;
    color: #ccc;
    margin-bottom: 1rem;
}

.no-posts p {
    font-size: 1.1rem;
    margin: 0;
}

/* 响应式设计 */
@media screen and (max-width: 768px) {
    .modal-content {
        margin: 10% auto;
        width: 95%;
    }

    .user-dropdown {
        position: fixed;
        top: 70px;
        right: 1rem;
        left: 1rem;
        width: auto;
    }

    .posts-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .post-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}