/* index.css */

:root {
            --primary-blue: #3498db;
            --secondary-blue: #2980b9;
            --light-blue: #e1f5fe;
            --teal: #1abc9c;
            --light-teal: #d1f2eb;
            --dark: #2c3e50;
            --light: #ecf0f1;
            --white: #ffffff;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
        }
        
        body {
            background-color: #f9fbfd;
            background-image: linear-gradient(135deg, #f5f7fa 0%, #e4edf5 100%);
            color: var(--dark);
            line-height: 1.6;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        
        /* 头部样式 */
        header {
            background: linear-gradient(120deg, var(--primary-blue), var(--teal));
            padding: 1rem 5%;
            display: flex;
            justify-content: space-between;
            align-items: center;
            box-shadow: var(--shadow);
            position: relative;
            z-index: 100;
        }
        
        .logo {
            display: flex;
            align-items: center;
            color: var(--white);
            text-decoration: none;
        }
        
        .logo i {
            font-size: 2.5rem;
            margin-right: 0.8rem;
            color: var(--light);
        }
        
        .logo h1 {
            font-size: 1.8rem;
            font-weight: 700;
            letter-spacing: 1px;
            text-shadow: 0 2px 4px rgba(0,0,0,0.2);
        }
        
        .nav-buttons {
            display: flex;
            gap: 1rem;
        }
        
        .btn {
            padding: 0.6rem 1.5rem;
            border: none;
            border-radius: 50px;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.5rem;
        }
        
        .btn-login {
            background-color: var(--white);
            color: var(--primary-blue);
            box-shadow: 0 4px 8px rgba(0,0,0,0.15);
        }
        
        .btn-login:hover {
            background-color: var(--light);
            transform: translateY(-2px);
            box-shadow: 0 6px 12px rgba(0,0,0,0.2);
        }
        
        /* 主内容区 */
        .hero {
            text-align: center;
            padding: 3rem 1rem;
            background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><rect width="100" height="100" fill="%23f0f9ff"/><path d="M0,50 Q25,25 50,50 T100,50 L100,100 L0,100 Z" fill="%23d1f2eb" opacity="0.5"/></svg>');
            background-size: cover;
        }
        
        .hero h2 {
            font-size: 2.8rem;
            margin-bottom: 1rem;
            color: var(--dark);
            background: linear-gradient(90deg, var(--primary-blue), var(--teal));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        
        .hero p {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto 2rem;
            color: var(--secondary-blue);
        }
        
        /* 功能区网格 */
        .features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            padding: 2rem 5%;
            max-width: 1400px;
            margin: 0 auto;
        }
        
        .feature-card {
            background: var(--white);
            border-radius: 16px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border: 2px solid transparent;
            position: relative;
        }
        
        .feature-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 12px 24px rgba(0,0,0,0.15);
            border-color: var(--teal);
        }
        
        .feature-card.new::after {
            content: 'NEW';
            position: absolute;
            top: -10px;
            right: -10px;
            background: linear-gradient(45deg, #ff6b6b, #ff8e53);
            color: white;
            font-weight: bold;
            padding: 0.5rem 1rem;
            border-radius: 20px;
            font-size: 0.8rem;
            z-index: 10;
            box-shadow: 0 4px 8px rgba(0,0,0,0.2);
        }
        
        .card-header {
            padding: 1.5rem;
            background: linear-gradient(90deg, var(--primary-blue), var(--teal));
            color: var(--white);
            text-align: center;
        }
        
        .card-header i {
            font-size: 2.5rem;
            margin-bottom: 1rem;
        }
        
        .card-header h3 {
            font-size: 1.5rem;
        }
        
        .card-body {
            padding: 1.5rem;
            text-align: center;
            min-height: 120px;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        
        .card-body p {
            color: #555;
            margin-bottom: 1.5rem;
        }
        
        .btn-feature {
            background: linear-gradient(90deg, var(--primary-blue), var(--teal));
            color: var(--white);
            width: 80%;
            margin: 0 auto;
        }
        
        .btn-feature:hover {
            transform: scale(1.05);
            box-shadow: 0 6px 12px rgba(52, 152, 219, 0.4);
        }
        
        /* 友情链接区域 */
        .friends-links {
            background: var(--light-blue);
            padding: 2rem 5%;
            text-align: center;
            margin-top: 2rem;
        }
        
        .friends-links h3 {
            font-size: 1.5rem;
            margin-bottom: 1.5rem;
            color: var(--secondary-blue);
        }
        
        .links-container {
            display: flex;
            justify-content: center;
            gap: 2rem;
            flex-wrap: wrap;
        }
        
        .friend-link {
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 1.2rem;
            background: var(--white);
            border-radius: 12px;
            width: 150px;
            box-shadow: var(--shadow);
            transition: var(--transition);
            text-decoration: none;
            color: var(--dark);
        }
        
        .friend-link:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 16px rgba(0,0,0,0.15);
            background: linear-gradient(135deg, var(--light-blue), var(--light-teal));
        }
        
        .friend-link i {
            font-size: 2.5rem;
            margin-bottom: 0.8rem;
            color: var(--teal);
        }
        
        /* 底部样式 */
        footer {
            background: var(--dark);
            color: var(--light);
            padding: 2rem 5%;
            margin-top: auto;
            text-align: center;
        }
        
        .footer-content {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            align-items: center;
        }
        
        .footer-links {
            display: flex;
            gap: 2rem;
            margin: 1.5rem 0;
            flex-wrap: wrap;
            justify-content: center;
        }
        
        .footer-links a {
            color: var(--light);
            text-decoration: none;
            transition: var(--transition);
        }
        
        .footer-links a:hover {
            color: var(--teal);
            text-decoration: underline;
        }
        
        .copyright {
            margin-top: 1rem;
            font-size: 0.9rem;
            color: #bbb;
        }
        
        /* 登录模态框 */
        .modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.7);
            z-index: 1000;
            justify-content: center;
            align-items: center;
        }
        
        .modal-content {
            background: var(--white);
            border-radius: 16px;
            width: 100%;
            max-width: 450px;
            overflow: hidden;
            box-shadow: 0 20px 40px rgba(0,0,0,0.3);
            animation: modalAppear 0.4s ease;
        }
        
        @keyframes modalAppear {
            from {
                opacity: 0;
                transform: translateY(-50px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        
        .modal-header {
            background: linear-gradient(90deg, var(--primary-blue), var(--teal));
            padding: 1.5rem;
            text-align: center;
            color: var(--white);
            position: relative;
        }
        
        .close-modal {
            position: absolute;
            top: 1rem;
            right: 1.5rem;
            font-size: 1.5rem;
            cursor: pointer;
            transition: var(--transition);
        }
        
        .close-modal:hover {
            transform: scale(1.2);
        }
        
        .modal-body {
            padding: 2rem;
        }
        
        .form-group {
            margin-bottom: 1.5rem;
        }
        
        .form-group label {
            display: block;
            margin-bottom: 0.5rem;
            font-weight: 500;
            color: var(--dark);
        }
        
        .form-group input {
            width: 100%;
            padding: 0.8rem 1.2rem;
            border: 1px solid #ddd;
            border-radius: 8px;
            font-size: 1rem;
            transition: var(--transition);
        }
        
        .form-group input:focus {
            border-color: var(--primary-blue);
            outline: none;
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
        }
        
        .btn-login-submit {
            background: linear-gradient(90deg, var(--primary-blue), var(--teal));
            color: var(--white);
            width: 100%;
            padding: 0.9rem;
            font-size: 1.1rem;
            font-weight: 600;
            border-radius: 8px;
            border: none;
            cursor: pointer;
            transition: var(--transition);
        }
        
        .btn-login-submit:hover {
            opacity: 0.9;
            transform: translateY(-2px);
        }
        
        .register-link {
            text-align: center;
            margin-top: 1.5rem;
            color: #555;
        }
        
        .register-link a {
            color: var(--teal);
            text-decoration: none;
            font-weight: 600;
        }
        
        .register-link a:hover {
            text-decoration: underline;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .hero h2 {
                font-size: 2.2rem;
            }
            
            .features {
                grid-template-columns: 1fr;
                padding: 2rem;
            }
            
            .nav-buttons {
                gap: 0.5rem;
            }
            
            .btn {
                padding: 0.5rem 1rem;
            }
        }
        /* 原有样式保持不变，新增以下样式 */
        
        /* 用户菜单 */
        .user-menu {
            position: relative;
            display: flex;
            align-items: center;
            gap: 10px;
            cursor: pointer;
        }
        
        .user-avatar {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            object-fit: cover;
            border: 2px solid var(--light);
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }
        
        .user-info {
            display: flex;
            flex-direction: column;
            color: var(--white);
        }
        
        .user-name {
            font-weight: 600;
            font-size: 0.9rem;
        }
        
        .user-status {
            font-size: 0.75rem;
            opacity: 0.8;
        }
        
        .dropdown-menu {
            position: absolute;
            top: 100%;
            right: 0;
            background: var(--white);
            border-radius: 8px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.15);
            min-width: 180px;
            z-index: 1000;
            display: none;
            overflow: hidden;
            margin-top: 10px;
        }
        
        .dropdown-menu.show {
            display: block;
            animation: fadeIn 0.3s ease;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(-10px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .dropdown-item {
            padding: 0.8rem 1.2rem;
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--dark);
            text-decoration: none;
            transition: var(--transition);
        }
        
        .dropdown-item:hover {
            background: var(--light-blue);
            color: var(--primary-blue);
        }
        
        .dropdown-divider {
            height: 1px;
            background: #eee;
            margin: 5px 0;
        }
        
        /* 欢迎横幅 */
        .welcome-banner {
            background: linear-gradient(90deg, var(--primary-blue), var(--teal));
            color: white;
            padding: 0.8rem 5%;
            text-align: center;
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 10px;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }
        
        .welcome-banner i {
            font-size: 1.2rem;
        }
        
        .welcome-banner a {
            color: var(--light);
            text-decoration: underline;
            margin-left: 5px;
        }

        /* 新增动画效果 */
@keyframes shake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-5px); }
    40%, 80% { transform: translateX(5px); }
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 错误消息样式 */
.error-message {
    color: #e74c3c;
    background: #fdecea;
    padding: 10px;
    border-radius: 5px;
    margin-bottom: 15px;
    animation: shake 0.5s;
}

/* 成功消息样式 */
.success-message {
    text-align: center;
    padding: 20px;
}

.success-message h2 {
    color: #2c3e50;
    margin-bottom: 15px;
}

/* 加载旋转动画 */
.spinner {
    display: inline-block;
    width: 30px;
    height: 30px;
    border: 3px solid rgba(52, 152, 219, 0.3);
    border-radius: 50%;
    border-top-color: #3498db;
    animation: spin 1s linear infinite;
}

/* 添加到index.css底部 */
.success-message {
    text-align: center;
    padding: 20px;
    background: #d4edda;
    border-radius: 8px;
    color: #155724;
}

.success-message i {
    font-size: 3rem;
    margin-bottom: 15px;
    color: #28a745;
}

.success-message h2 {
    margin-bottom: 10px;
}

.success-message p {
    margin-top: 10px;
    font-size: 0.9rem;
}