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

body {
    font-family: 'Microsoft YaHei', Arial, sans-serif;
    line-height: 1.6;
    background-color: #f5f5f5;
}

/* 登录页面样式 */
.login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.login-container {
    background: white;
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    width: 100%;
    max-width: 400px;
}

.login-container h1 {
    text-align: center;
    color: #333;
    margin-bottom: 1.5rem;
}

.login-form .form-group {
    margin-bottom: 1rem;
}

.login-form label {
    display: block;
    margin-bottom: 0.5rem;
    color: #666;
}

.login-form input {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-size: 1rem;
}

.login-form button {
    width: 100%;
    padding: 0.8rem;
    background: #4a90e2;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background 0.3s ease;
}

.login-form button:hover {
    background: #357abd;
}

.error-message {
    background: #ffebee;
    color: #c62828;
    padding: 0.8rem;
    border-radius: 4px;
    margin-bottom: 1rem;
    text-align: center;
}

/* 主页面样式 */
.main-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.platform-card {
    background: white;
    border-radius: 8px;
    padding: 1.5rem;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.platform-card:hover {
    transform: translateY(-5px);
}

.platform-card img {
    width: 64px;
    height: 64px;
    margin-bottom: 1rem;
}

.platform-card h3 {
    color: #333;
    margin-bottom: 0.5rem;
}

.platform-card p {
    color: #666;
    margin-bottom: 1rem;
}

.platform-card .btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: #4a90e2;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    transition: background 0.3s ease;
}

.platform-card .btn:hover {
    background: #357abd;
}

/* 顶部导航栏 */
.navbar {
    background: white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    padding: 1rem 2rem;
}

.navbar-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar h1 {
    color: #333;
    font-size: 1.5rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-info span {
    color: #666;
}

.logout-btn {
    padding: 0.5rem 1rem;
    background: #dc3545;
    color: white;
    text-decoration: none;
    border-radius: 4px;
    transition: background 0.3s ease;
}

.logout-btn:hover {
    background: #c82333;
}