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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.auth-container {
    width: 100%;
    max-width: 400px;
}

.auth-card {
    background: white;
    border-radius: 12px;
    padding: 40px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
}

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

.auth-header h1 {
    font-size: 28px;
    color: #333;
    margin-bottom: 8px;
    font-weight: 600;
}

.auth-header p {
    color: #666;
    font-size: 14px;
}

.auth-form h2 {
    font-size: 24px;
    color: #333;
    margin-bottom: 24px;
    font-weight: 600;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: #333;
    font-size: 14px;
    font-weight: 500;
}

.form-group input {
    width: 100%;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: 6px;
    font-size: 14px;
    transition: border-color 0.2s;
    font-family: inherit;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.btn {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    font-family: inherit;
}

.btn-primary {
    background: #667eea;
    color: white;
}

.btn-primary:hover:not(:disabled) {
    background: #5568d3;
}

.btn-primary:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.auth-switch {
    text-align: center;
    margin-top: 20px;
    color: #666;
    font-size: 14px;
}

.auth-switch a {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
}

.auth-switch a:hover {
    text-decoration: underline;
}

.error-message {
    background: #fee;
    color: #c33;
    padding: 12px;
    border-radius: 6px;
    margin-top: 20px;
    font-size: 14px;
    border: 1px solid #fcc;
    white-space: pre-line; /* 支持换行 */
}

.error-message.success-message {
    background: #efe;
    color: #3c3;
    border: 1px solid #cfc;
}

/* 响应式设计 */
@media (max-width: 480px) {
    .auth-card {
        padding: 30px 20px;
    }

    .auth-header h1 {
        font-size: 24px;
    }

    .auth-form h2 {
        font-size: 20px;
    }
}