/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: #333;
    margin: 0;
    padding-bottom: 60px; /* 为固定页脚留出空间 */
}

/* 主容器布局 */
.main-container {
    display: flex;
    min-height: 100vh;
    gap: 30px;
    padding: 20px;
}

/* 左侧区域样式 */
.left-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.announcement-container {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 20px;
    padding: 25px;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.announcement-container h2 {
    color: #333;
    font-size: 1.5rem;
    margin-bottom: 20px;
    text-align: center;
    position: relative;
}

.announcement-container h2::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 50px;
    height: 3px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 2px;
}

.announcement-content {
    min-height: 200px;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    width: 100%;
    padding: 0;
    gap: 0;
}

.announcement-item {
    padding: 20px 0;
    border-bottom: 1px solid #e9ecef;
    transition: all 0.3s ease;
    width: 100%;
}

.announcement-item:last-child {
    border-bottom: none;
}

.announcement-item:hover {
    background: rgba(102, 126, 234, 0.02);
    border-radius: 8px;
    margin: 0 -10px;
    padding: 20px 10px;
}

.announcement-item h3 {
    color: #333;
    font-size: 1.2rem;
    margin-bottom: 12px;
    font-weight: 600;
}

.announcement-item p {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.6;
    margin-bottom: 10px;
}

.announcement-item .announcement-body {
    margin-bottom: 15px;
}

.announcement-item .announcement-body img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 10px 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.announcement-item .announcement-content h1,
.announcement-item .announcement-content h2,
.announcement-item .announcement-content h3 {
    color: #333;
    margin: 15px 0 10px 0;
}

.announcement-item .announcement-content h1 {
    font-size: 1.4rem;
}

.announcement-item .announcement-content h2 {
    font-size: 1.2rem;
}

.announcement-item .announcement-content h3 {
    font-size: 1.1rem;
}

.announcement-item .announcement-content p {
    margin-bottom: 12px;
}

.announcement-item .announcement-content ul {
    margin: 10px 0;
    padding-left: 20px;
}

.announcement-item .announcement-content li {
    margin-bottom: 5px;
    color: #666;
}

.announcement-item .announcement-content strong {
    color: #333;
    font-weight: 600;
}

.announcement-item .announcement-content em {
    font-style: italic;
    color: #555;
}

.announcement-item .announcement-content a {
    color: #667eea;
    text-decoration: none;
}

.announcement-item .announcement-content a:hover {
    text-decoration: underline;
}

.announcement-item .date {
    color: #999;
    font-size: 0.85rem;

    margin-top: 15px;
    text-align: left;
    font-style: italic;
}

/* 右侧区域样式 */
.right-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.form-container {
    background: rgba(255, 255, 255, 0.95);
    padding: 40px;
    border-radius: 25px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    width: 100%;
    max-width: 500px;
}

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

.form-header h1 {
    font-size: 2.2rem;
    margin-bottom: 10px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.form-header p {
    color: #666;
    font-size: 1rem;
}

/* 表单样式 */
.registration-form {
    margin-bottom: 25px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: #555;
    font-size: 0.95rem;
}

.form-group input {
    width: 100%;
    padding: 15px 18px;
    border: 2px solid #e1e5e9;
    border-radius: 12px;
    font-size: 16px;
    transition: all 0.3s ease;
    background: #f8f9fa;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
    background: white;
}

.form-actions {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-top: 30px;
}

.btn {
    padding: 14px 32px;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
    min-width: 120px;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 30px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: #f8f9fa;
    color: #6c757d;
    border: 2px solid #e9ecef;
}

.btn-secondary:hover {
    background: #e9ecef;
    border-color: #dee2e6;
    transform: translateY(-2px);
}

/* 管理员链接 */
.admin-link {
    text-align: center;
    margin-top: 20px;
}

.admin-btn {
    background: rgba(102, 126, 234, 0.1);
    color: #667eea;
    padding: 12px 24px;
    border-radius: 25px;
    text-decoration: none;
    transition: all 0.3s ease;
    border: 2px solid rgba(102, 126, 234, 0.3);
    font-weight: 600;
}

.admin-btn:hover {
    background: rgba(102, 126, 234, 0.2);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(102, 126, 234, 0.2);
}

/* 消息提示 */
.message {
    padding: 15px;
    border-radius: 12px;
    margin-top: 20px;
    text-align: center;
    font-weight: 600;
    display: none;
    width: 100%;
    max-width: 500px;
}

.message.success {
    background: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
    display: block;
}

.message.error {
    background: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
    display: block;
}

/* 加载状态 */
.loading {
    color: #999;
    font-style: italic;
    text-align: center;
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .main-container {
        flex-direction: column;
        gap: 20px;
    }
    
    .left-section {
        order: 2;
    }
    
    .right-section {
        order: 1;
    }
    
    .form-container {
        max-width: 100%;
        padding: 30px;
    }
}

@media (max-width: 768px) {
    .main-container {
        padding: 15px;
    }
    
    .form-container {
        padding: 25px;
    }
    
    .form-header h1 {
        font-size: 1.8rem;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
    }
    
    .announcement-container {
        padding: 20px;
    }
}

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

.announcement-container,
.form-container {
    animation: fadeInUp 0.6s ease-out;
}

.announcement-container {
    animation-delay: 0.1s;
}

.form-container {
    animation-delay: 0.2s;
}

/* 页脚样式 */
.footer {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 -5px 15px rgba(0, 0, 0, 0.1);
    z-index: 1000;
}

.footer-content {
    padding: 0px 2px;
    text-align: center;
    color: #666;
    font-size: 0.9rem;
}

.footer-content p {
    margin: 0;
    line-height: 1.4;
}