/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
.header {
    background-color: #2c3e50;
    color: white;
    padding: 15px 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    display: flex;
    align-items: center;
    color: white;
    text-decoration: none;
}

.logo-img {
    height: 40px;
    margin-right: 10px;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: bold;
}

.nav ul {
    display: flex;
    list-style: none;
}

.nav ul li {
    margin-left: 25px;
}

.nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

.nav ul li a:hover {
    color: #3498db;
}

.mobile-menu-btn {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
}

/* 主要内容样式 */
.main-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 0;
}

.login-container {
    width: 100%;
    max-width: 450px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    padding: 30px;
    margin: 20px;
}

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

.login-header h1 {
    font-size: 24px;
    color: #2c3e50;
    margin-bottom: 10px;
}

.login-header p {
    color: #7f8c8d;
    font-size: 14px;
}

/* 表单样式 */
.login-form .form-group {
    margin-bottom: 20px;
}

.login-form label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #2c3e50;
}

.input-with-icon {
    position: relative;
}

.input-with-icon i {
    position: absolute;
    left: 15px;
    top: 50%;
    transform: translateY(-50%);
    color: #7f8c8d;
}

.login-form input[type="text"],
.login-form input[type="password"] {
    width: 100%;
    padding: 12px 15px 12px 40px;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 16px;
    transition: border-color 0.3s;
}

.login-form input[type="text"]:focus,
.login-form input[type="password"]:focus {
    border-color: #3498db;
    outline: none;
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    font-size: 14px;
}

.remember-me {
    display: flex;
    align-items: center;
}

.remember-me input {
    margin-right: 8px;
}

.forgot-password {
    color: #3498db;
    text-decoration: none;
}

.forgot-password:hover {
    text-decoration: underline;
}

.login-btn {
    width: 100%;
    padding: 12px;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.3s;
}

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

.social-login {
    text-align: center;
    margin: 25px 0;
    padding: 20px 0;
    border-top: 1px solid #eee;
    border-bottom: 1px solid #eee;
}

.social-login p {
    color: #7f8c8d;
    margin-bottom: 15px;
    font-size: 14px;
}

.social-icons {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.social-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    color: white;
    text-decoration: none;
    font-size: 18px;
    transition: transform 0.3s;
}

.social-icon:hover {
    transform: translateY(-3px);
}

.social-icon.wechat {
    background-color: #07C160;
}

.social-icon.qq {
    background-color: #12B7F5;
}

.social-icon.weibo {
    background-color: #E6162D;
}

.register-link {
    text-align: center;
    margin-top: 20px;
    font-size: 14px;
}

.register-link a {
    color: #3498db;
    text-decoration: none;
    font-weight: 500;
}

.register-link a:hover {
    text-decoration: underline;
}

/* 底部样式 */
.footer {
    background-color: #2c3e50;
    color: white;
    padding: 40px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin-bottom: 30px;
}

.footer-section h3 {
    font-size: 18px;
    margin-bottom: 15px;
    color: #ecf0f1;
}

.footer-section p {
    color: #bdc3c7;
    margin-bottom: 10px;
    font-size: 14px;
}

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

.footer-section ul li {
    margin-bottom: 8px;
}

.footer-section ul li a {
    color: #bdc3c7;
    text-decoration: none;
    font-size: 14px;
    transition: color 0.3s;
}

.footer-section ul li a:hover {
    color: #3498db;
}

.footer-section.contact i {
    margin-right: 8px;
    width: 16px;
    text-align: center;
}

.footer-bottom {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 13px;
    color: #bdc3c7;
}

/* 响应式设计 */
@media (max-width: 768px) {
    /* 头部响应式 */
    .nav {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: #2c3e50;
        transition: left 0.3s;
    }

    .nav.active {
        left: 0;
    }

    .nav ul {
        flex-direction: column;
        padding: 20px;
    }

    .nav ul li {
        margin: 15px 0;
    }

    .mobile-menu-btn {
        display: block;
    }

    /* 登录容器响应式 */
    .login-container {
        padding: 25px 20px;
        margin: 10px;
    }

    /* 底部响应式 */
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .login-header h1 {
        font-size: 22px;
    }

    .login-form input[type="text"],
    .login-form input[type="password"] {
        padding: 10px 15px 10px 40px;
    }

    .login-btn {
        padding: 10px;
    }

    .social-icons {
        gap: 10px;
    }

    .social-icon {
        width: 35px;
        height: 35px;
        font-size: 16px;
    }
}