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

/* 基础样式设置 */
body {
    font-family: "Microsoft YaHei", "SimSun", "Arial", sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: #333;
    background-color: #f3f4f6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* 容器样式 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 头部样式 */
.site-header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    padding: 16px 0;
}

.header-content {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo {
    height: 48px;
    width: auto;
    border-radius: 4px;
}

.site-title {
    font-size: 24px;
    font-weight: bold;
    color: #333;
}

/* 主要内容区域 */
.main-content {
    flex-grow: 1;
    padding: 48px 0;
}

/* 卡片样式 */
.login-card, .content-card {
    background-color: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    padding: 32px;
    max-width: 500px;
    margin: 0 auto;
}

/* 标题样式 */
.section-title {
    font-size: 24px;
    font-weight: bold;
    color: #333;
    text-align: center;
    margin-bottom: 24px;
}

/* 表单样式 */
.form-group {
    margin-bottom: 16px;
}

.form-label {
    display: block;
    color: #555;
    margin-bottom: 8px;
}

.password-input-group {
    position: relative;
}

.form-input {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
}

.form-input:focus {
    outline: none;
    border-color: #3B82F6;
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

.toggle-password {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    color: #888;
    cursor: pointer;
    font-size: 18px;
}

.toggle-password:hover {
    color: #555;
}

/* 按钮样式 */
.btn-primary {
    width: 100%;
    background-color: #3B82F6;
    color: #fff;
    font-weight: 500;
    padding: 10px 16px;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-primary:hover {
    background-color: #1E40AF;
}

/* 错误信息 */
.error-message {
    color: #EF4444;
    text-align: center;
    margin-top: 16px;
}

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

/* 资源区域样式 */
.resources-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.resource-item {
    padding: 16px;
    border: 1px solid #eee;
    border-radius: 8px;
    transition: box-shadow 0.3s ease;
}

.resource-item:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.resource-title {
    font-size: 20px;
    font-weight: 600;
    color: #444;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.icon-video {
    color: #3B82F6;
}

.icon-pdf {
    color: #DC2626;
}

.resource-desc {
    color: #666;
    margin-bottom: 16px;
}

.download-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background-color: #3B82F6;
    color: #fff;
    font-weight: 500;
    padding: 12px 24px;
    border-radius: 8px;
    text-decoration: none;
    transition: background-color 0.3s ease;
    width: 100%;
}

.download-btn:hover {
    background-color: #1E40AF;
}

/* 页脚样式 */
.site-footer {
    background-color: #0771AF;
    color: #fff;
    padding: 24px 0;
    margin-top: auto;
}

.copyright {
    text-align: center;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .site-title {
        font-size: 20px;
    }
    
    .login-card, .content-card {
        padding: 24px;
    }
    
    .section-title {
        font-size: 20px;
    }
}