/* 基础样式 */
:root {
    --primary-color: #003366;
    --secondary-color: #007bff;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', '微软雅黑', sans-serif;
    line-height: 1.6;
    background: #f8f9fa;
}

/* 响应式容器 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

/* 头部样式 */
.header {
    background: var(--primary-color);
    padding: 1rem 0;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

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

.logo {
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
}

.nav-links a {
    color: white;
    text-decoration: none;
    margin-left: 2rem;
    transition: opacity 0.3s;
}

/* 登录区域 */
.login-section {
    padding: 3rem 0;
    min-height: 70vh;
}

.login-box {
    background: white;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    padding: 2rem;
    max-width: 400px;
    margin: 0 auto;
}

.form-title {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
}

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

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.btn-login {
    background: var(--primary-color);
    color: white;
    width: 100%;
    padding: 0.75rem;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.3s;
}

/* 底部样式 */
.footer {
    background: var(--primary-color);
    color: white;
    padding: 2rem 0;
    text-align: center;
}

.footer-links {
    margin-bottom: 1rem;
}

.footer-links a {
    color: white;
    margin: 0 1rem;
    text-decoration: none;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }

    .nav-links {
        margin-top: 1rem;
    }

    .nav-links a {
        margin: 0 1rem;
    }

    .login-box {
        padding: 1.5rem;
    }
}

/* SEO增强 */
.seo-text {
    position: absolute;
    left: -9999px;
}