/* 全局样式重置 - 保留原有基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft YaHei", sans-serif;
}

body {
    background-color: #f8f9fa;
    color: #333;
}

/* 登录/注册页面样式 - 保留原有 */
.login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background-color: #f0f2f5;
}

.login-container {
    width: 100%;
    max-width: 400px;
    padding: 20px;
}

.login-card {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.login-card h2 {
    text-align: center;
    margin-bottom: 20px;
    color: #333;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.login-form input {
    padding: 12px 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-size: 16px;
}

.remember-me {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: #666;
}

.login-btn {
    padding: 12px;
    border: none;
    border-radius: 5px;
    background-color: #2ecc71;
    color: white;
    font-size: 16px;
    cursor: pointer;
    transition: background 0.3s;
}

.login-btn:hover {
    background-color: #27ae60;
}

.register-link {
    text-align: center;
    margin-top: 15px;
    font-size: 14px;
}

.register-link a {
    color: #3498db;
    text-decoration: none;
}

/* 导航栏样式 - 整合头像样式，保留原有基础样式 */
.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background: white;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.logo {
    font-size: 20px;
    font-weight: bold;
    color: #2ecc71;
}

nav {
    display: flex;
    align-items: center;
    gap: 20px;
}

nav a {
    text-decoration: none;
    color: #333;
    font-size: 16px;
}

nav a:hover {
    color: #2ecc71;
}

/* 激活状态的导航链接（留言板专用） */
nav a.active {
    color: #3498db;
    border-bottom: 2px solid #3498db;
}

.auth-btn {
    padding: 8px 15px;
    border: none;
    border-radius: 5px;
    background: #3498db;
    color: white;
    cursor: pointer;
    text-decoration: none;
    font-size: 14px;
    transition: background-color 0.3s;
}

.auth-btn:hover {
    background-color: #2980b9;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

/* 圆形头像样式 - 新增，与原有样式兼容 */
.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid #3498db;
    cursor: pointer;
    transition: transform 0.3s;
}

.user-avatar:hover {
    transform: scale(1.1);
}

.sign-btn {
    padding: 8px 15px;
    border: none;
    border-radius: 5px;
    background: #e67e22;
    color: white;
    cursor: pointer;
    font-size: 14px;
}

/* 主体内容样式 - 保留原有 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 30px 20px;
}

.profile {
    display: flex;
    align-items: center;
    gap: 30px;
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 40px;
}

.profile-img {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid #f0f0f0;
}

.profile-info h2 {
    margin-bottom: 15px;
    color: #333;
}

.profile-info p {
    margin-bottom: 10px;
    line-height: 1.6;
}

.tag {
    display: inline-block;
    padding: 5px 10px;
    background: #e8f4fd;
    color: #3498db;
    border-radius: 20px;
    font-size: 14px;
    margin-right: 8px;
    margin-top: 5px;
}

.materials h2 {
    margin-bottom: 20px;
    color: #333;
    font-size: 24px;
}

.material-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.material-card {
    background: white;
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    transition: transform 0.3s;
}

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

.material-card h3 {
    margin-bottom: 10px;
    color: #2ecc71;
}

.material-card p {
    margin-bottom: 15px;
    font-size: 14px;
    color: #666;
    line-height: 1.5;
}

.material-card a {
    display: inline-block;
    padding: 8px 15px;
    background: #3498db;
    color: white;
    border-radius: 5px;
    text-decoration: none;
    font-size: 14px;
}

.contact h2 {
    margin: 40px 0 20px;
    color: #333;
    font-size: 24px;
}

.contact-info {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 15px;
    font-size: 16px;
}

.contact-item i {
    font-size: 20px;
    color: #3498db;
    width: 24px;
    text-align: center;
}

/* 留言板专用样式 - 新增，与原有样式统一 */
.main-content {
    max-width: 1200px;
    margin: 30px auto;
    padding: 0 20px;
}

.text-center {
    text-align: center;
    margin-bottom: 30px;
}

.text-center h2 {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    margin-bottom: 10px;
    color: #333;
}

.text-center p {
    color: #666;
    max-width: 800px;
    margin: 0 auto 20px;
}

.divider {
    width: 80px;
    height: 3px;
    background-color: #3498db;
    margin: 0 auto;
}

.comment-form-container {
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    padding: 20px;
    margin-bottom: 30px;
}

.form-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    color: #333;
}

.form-title i {
    color: #3498db;
    margin-right: 10px;
}

.form-group {
    margin-bottom: 15px;
}

.form-group label {
    display: block;
    margin-bottom: 5px;
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.form-control:focus {
    outline: none;
    border-color: #3498db;
    box-shadow: 0 0 0 2px rgba(52, 152, 219, 0.2);
}

.form-control:disabled {
    background-color: #f9f9f9;
    cursor: not-allowed;
}

.btn-group {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 20px;
}

/* 留言板按钮样式 - 整合原有按钮样式，避免重复 */
#submit-btn {
    background-color: #3498db;
    color: white;
    padding: 8px 15px;
    border-radius: 4px;
    transition: background-color 0.3s;
}

#submit-btn:hover {
    background-color: #2980b9;
}

#cancel-btn {
    background-color: transparent;
    color: #666;
    border: 1px solid #ddd;
    padding: 8px 15px;
    border-radius: 4px;
}

.message-list {
    margin-top: 30px;
}

.message-item {
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    padding: 20px;
    margin-bottom: 20px;
    transition: transform 0.3s;
}

.message-item:hover {
    transform: translateY(-3px);
}

.message-header {
    display: flex;
    align-items: center;
    margin-bottom: 15px;
}

.message-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
    margin-right: 15px;
    border: 2px solid #f0f0f0;
}

.message-meta {
    flex: 1;
}

.message-author {
    font-weight: 600;
    margin-bottom: 5px;
}

.message-time {
    color: #999;
    font-size: 0.9rem;
}

.message-content {
    line-height: 1.8;
    color: #333;
    padding-left: 65px;
}

.no-message {
    text-align: center;
    padding: 50px 20px;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    color: #999;
}

.no-message i {
    font-size: 3rem;
    margin-bottom: 10px;
    color: #ddd;
}

.load-more {
    text-align: center;
    margin: 30px auto;
}

.load-more-btn {
    padding: 10px 20px;
    border: 1px solid #3498db;
    border-radius: 4px;
    background-color: transparent;
    color: #3498db;
    cursor: pointer;
    transition: all 0.3s;
}

.load-more-btn:hover {
    background-color: #3498db;
    color: white;
}

.form-tabs {
    display: flex;
    border-bottom: 1px solid #eee;
    margin-bottom: 20px;
}

.form-tab {
    padding: 10px 20px;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    transition: all 0.3s;
}

.form-tab.active {
    border-bottom-color: #3498db;
    color: #3498db;
    font-weight: 600;
}

.form-tab:hover {
    color: #3498db;
}

.draw-area {
    display: none;
    margin-top: 10px;
}

.draw-tools {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
}

.tool-item {
    padding: 5px 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s;
}

.tool-item.active {
    border-color: #3498db;
    color: #3498db;
    background-color: rgba(52, 152, 219, 0.1);
}

.tip-alert {
    background-color: rgba(52, 152, 219, 0.1);
    border-left: 4px solid #3498db;
    padding: 10px 15px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
}

.tip-alert i {
    color: #3498db;
    margin-right: 10px;
}

/* 隐藏元素通用类 */
.hidden {
    display: none;
}

/* 页脚样式 - 保留原有 */
footer {
    text-align: center;
    padding: 20px;
    background: white;
    margin-top: 40px;
    color: #666;
    font-size: 14px;
}

/* 响应式适配 - 整合所有响应式样式，避免重复 */
@media (max-width: 768px) {
    .profile {
        flex-direction: column;
        text-align: center;
    }
    
    nav {
        gap: 10px;
        font-size: 14px;
    }
    
    .user-info {
        flex-wrap: wrap;
        justify-content: center;
    }

    /* 导航栏响应式 - 补充 */
    .nav-container {
        flex-direction: column;
        gap: 10px;
        padding: 10px 20px;
    }

    /* 留言板响应式 */
    .main-content {
        padding: 0 10px;
    }

    .form-tabs {
        flex-wrap: wrap;
    }

    .form-tab {
        flex: 1 1 50%;
        text-align: center;
        padding: 10px 5px;
    }

    .message-content {
        padding-left: 0;
    }

    .message-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .message-avatar {
        margin-bottom: 10px;
    }
}

/* 超小屏手机适配（320px及以下） - 保留原有 */
@media (max-width: 320px) {
    .logo {
        font-size: 16px;
        margin-right: 10px;
    }

    nav a {
        font-size: 12px;
        padding: 5px 5px;
    }

    #auth-entrance .auth-btn {
        padding: 5px 8px;
        font-size: 12px;
    }

    /* 留言板超小屏适配 */
    .form-control {
        font-size: 0.9rem;
        padding: 8px;
    }

    .message-item {
        padding: 15px;
    }
}

/* 大屏手机/平板适配（768px及以上） - 保留原有 */
@media (min-width: 768px) {
    .nav-container {
        padding: 15px 20px;
    }

    .logo {
        font-size: 20px;
    }

    nav a {
        font-size: 16px;
        gap: 20px;
    }
}